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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2017	Oct. 23, 2017
Document Information [Line Items]
Entity Registrant Name	APPFOLIO INC
Entity Central Index Key	0001433195
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		14,506,412
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		19,440,672

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 14,781	$ 10,699
Investment securities—current	28,396	15,473
Accounts receivable, net	3,419	2,511
Prepaid expenses and other current assets	4,393	3,537
Total current assets	50,989	32,220
Investment securities—noncurrent	20,423	26,688
Property and equipment, net	7,005	7,077
Capitalized software, net	17,320	15,539
Goodwill	6,737	6,737
Intangible assets, net	2,054	3,105
Other assets	1,219	1,217
Total assets	105,747	92,583
Current liabilities
Accounts payable	1,164	937
Accrued employee expenses	8,169	7,550
Accrued expenses	5,908	4,044
Deferred revenue	7,508	7,638
Other current liabilities	1,083	1,192
Total current liabilities	23,832	21,361
Other liabilities	1,238	1,540
Total liabilities	25,070	22,901
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 25,000 authorized and no shares issued and outstanding as of September 30, 2017 and December 31, 2016	0	0
Additional paid-in capital	150,520	146,692
Accumulated other comprehensive loss	(23)	(51)
Accumulated deficit	(69,824)	(76,963)
Total stockholders’ equity	80,677	69,682
Total liabilities and stockholders’ equity	105,747	92,583
Class A common stock
Stockholders’ equity:
Common stock	1	1
Class B common stock
Stockholders’ equity:
Common stock	$ 3	$ 3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Preferred stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A common stock
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	14,494,000	11,691,000
Common stock, shares outstanding	14,494,000	11,691,000
Class B common stock
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	19,448,000	22,028,000
Common stock, shares outstanding	19,448,000	22,028,000

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 37,903	$ 28,162	$ 105,906	$ 77,576
Costs and operating expenses:
Cost of revenue (exclusive of depreciation and amortization)	14,053	11,645	40,747	33,387
Sales and marketing	7,257	6,979	21,556	22,097
Research and product development	4,367	3,464	11,998	9,531
General and administrative	5,405	4,642	15,310	12,580
Depreciation and amortization	3,237	2,636	9,347	7,112
Total costs and operating expenses	34,319	29,366	98,958	84,707
Income (loss) from operations	3,584	(1,204)	6,948	(7,131)
Other expense, net	(5)	(12)	(93)	(34)
Interest income, net	155	102	377	221
Income (loss) before provision for income taxes	3,734	(1,114)	7,232	(6,944)
Provision for income taxes	52	11	93	48
Net income (loss)	$ 3,682	$ (1,125)	$ 7,139	$ (6,992)
Net income (loss) per common share:
Net income (loss) per share, basic (usd per share)	$ 0.11	$ (0.03)	$ 0.21	$ (0.21)
Net income (loss) per share, diluted (usd per share)	$ 0.10	$ (0.03)	$ 0.20	$ (0.21)
Weighted average common shares outstanding:
Weighted average number of shares used to compute basic net income (loss) per share (in shares)	33,905	33,600	33,817	33,529
Weighted average number of shares used to compute diluted net income (loss) per share (in shares)	35,205	33,600	35,091	33,529

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,682	$ (1,125)	$ 7,139	$ (6,992)
Other comprehensive income (loss):
Changes in unrealized gains (losses) on investment securities	26	(96)	28	277
Comprehensive income (loss)	$ 3,708	$ (1,221)	$ 7,167	$ (6,715)

Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Class A common stock	Common Stock Class B common stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss)/Income	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2016		11,691	22,028
Beginning balance at Dec. 31, 2016	$ 69,682	$ 1	$ 3	$ 146,692	$ (51)	$ (76,963)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	133	133
Exercise of stock options	$ 508			508
Stock-based compensation	4,674			4,674
Vesting of restricted stock units, net of shares withheld for taxes (in shares)		81
Vesting of restricted stock units, net of shares withheld for taxes	(1,421)			(1,421)
Vesting of early exercised shares	67			67
Conversion of Class B stock to Class A stock (in shares)		2,580	(2,580)
Conversion of Class B stock to Class A stock	0
Issuance of restricted stock awards (in shares)		9
Other comprehensive income	28				28
Net income	7,139					7,139
Ending balance (in shares) at Sep. 30, 2017		14,494	19,448
Ending balance at Sep. 30, 2017	$ 80,677	$ 1	$ 3	$ 150,520	$ (23)	$ (69,824)

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash from operating activities
Net income (loss)	$ 7,139	$ (6,992)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	9,347	7,112
Purchased investment premium, net of amortization	(22)	185
Amortization of deferred financing costs	48	48
Loss on disposal of property and equipment	94	33
Stock-based compensation	4,304	2,844
Lease abandonment	0	161
Changes in operating assets and liabilities:
Accounts receivable	(908)	(659)
Prepaid expenses and other current assets	(856)	(804)
Other assets	(54)	(163)
Accounts payable	369	(1,109)
Accrued employee expenses	846	(144)
Accrued expenses	1,713	1,354
Deferred revenue	(130)	1,674
Other liabilities	(334)	1,183
Net cash provided by operating activities	21,556	4,723
Cash from investing activities
Purchases of property and equipment	(1,680)	(3,560)
Additions to capitalized software	(8,085)	(8,554)
Purchases of investment securities	(17,597)	(24,334)
Sales of investment securities	15	10,016
Maturities of investment securities	10,974	17,112
Purchases of intangible assets	(1)	(2)
Net cash used in investing activities	(16,374)	(9,322)
Cash from financing activities
Proceeds from stock option exercises	508	260
Tax withholding for net share settlement	(1,608)	(85)
Principal payments under capital lease obligations	0	(24)
Proceeds from issuance of debt	88	87
Principal payments on debt	(88)	(99)
Net cash (used in) provided by financing activities	(1,100)	139
Net increase (decrease) in cash and cash equivalents	4,082	(4,460)
Cash and cash equivalents
Beginning of period	10,699	12,063
End of period	14,781	7,603
Noncash investing and financing activities
Purchases of property and equipment included in accounts payable and accrued expenses	271	112
Additions of capitalized software included in accrued employee expenses	231	231
Stock-based compensation capitalized for software development	$ 548	$ 308

Nature of Business	9 Months Ended
Nature of Business	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business AppFolio, Inc. (“we” or “AppFolio”) provides industry-specific, cloud-based software solutions for small and medium-sized businesses (“SMBs”) in the property management industry and solo practitioners and small law firms in the legal industry. We refer to solo practitioners and small law firms as SMBs in connection with our legal vertical in this Quarterly Report. Our platform is designed to be the system of record to automate essential business processes and the system of engagement to enhance business interactions between our customers and their clients and vendors. We also offer optional, but often mission-critical, Value+ services, which are seamlessly built into our core solutions.

Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation and Significant Accounting Policies

The accompanying unaudited Condensed Consolidated Financial Statements were prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. Accordingly, these Condensed Consolidated Financial Statements should be read in conjunction with our audited consolidated financial statements and the related notes included in our Annual Report filed with the SEC on February 27, 2017. The year-end condensed balance sheet was derived from our audited consolidated financial statements. Our unaudited interim Condensed Consolidated Financial Statements have been prepared on a basis consistent with that used to prepare our audited annual consolidated financial statements and include, in the opinion of management, all adjustments, consisting of normal and recurring items, necessary for the fair statement of the Condensed Consolidated Financial Statements. The operating results for the nine months ended September 30, 2017, are not necessarily indicative of the results expected for the full year ending December 31, 2017.

Changes in Accounting Policies

Except as described below under Recently Adopted Accounting Pronouncements, there have been no significant changes in our accounting policies from those disclosed in our annual consolidated financial statements and the related notes included in our Annual Report.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the dates of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates. On an ongoing basis, management evaluates its estimates based on historical data and experience, as well as various other factors that management believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources.

Net Income (Loss) per Share

The net income (loss) per common share was the same for our Class A and Class B common shares because they are entitled to the same liquidation and dividend rights and are therefore combined in the table below. The following table presents a reconciliation of our weighted average number of Class A and Class B common shares used to compute net income (loss) per share (in thousands):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2017	2016	2017	2016
Weighted average shares outstanding	33,923	33,668	33,848	33,617
Less: Weighted average unvested restricted shares subject to repurchase	18	68	31	88
Weighted average common shares outstanding; basic	33,905	33,600	33,817	33,529

Weighted average common shares outstanding; basic	33,905	33,600	33,817	33,529
Plus: Weighted average options, RSUs and restricted shares used to compute diluted net income per share	1,300	—	1,274	—
Weighted average common shares outstanding; diluted	35,205	33,600	35,091	33,529

Approximately 571,000 shares of performance based options ("PSOs") and performance based restricted stock units ("PSUs") are not included in the computations of diluted and anti-dilutive shares for the three and nine month periods ended September 30, 2017, as they are considered contingently issuable upon the satisfaction of pre-defined performance measures and their respective performance measures have not been met.

For the three and nine months ended September 30, 2016, we reported a net loss and therefore all potentially dilutive common shares are anti-dilutive and have been excluded from the calculation of net loss per share. The following table presents the number of anti-dilutive common shares excluded from the calculation of weighted average number of shares used to compute diluted net income (loss) per share for the three and nine months ended September 30, 2017 and 2016 (in thousands):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2017	2016	2017	2016
Options to purchase common stock	—	1,764	—	1,764
Unvested restricted stock awards	—	59	—	59
Unvested restricted stock units	13	480	13	480
Contingent restricted stock units⁽¹⁾	6	27	6	27
Total shares excluded from net income (loss) per common share	19	2,330	19	2,330

⁽¹⁾ Included in the anti-dilutive shares above are fixed price restricted stock unit (“RSU”) commitments for which the number of shares has not been determined at the grant date. The number of RSU shares with a fixed price included in the table above are 6,000 and 27,000 shares at September 30, 2017 and 2016, respectively. The number of shares have been determined by dividing the fixed price commitment to issue shares in the future by the closing price of our stock as of the applicable reporting period date.

Recently Adopted Accounting Pronouncements

Under the Jumpstart our Business Startups Act (the “JOBS Act”), we meet the definition of an emerging growth company. We have irrevocably elected to opt out of the extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act.

In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-09, Compensation - Stock Compensation (Topic 781), Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), which amends and simplifies the accounting for share-based payment awards in three areas: (1) income tax consequences, (2) classification of awards as either equity or liabilities, and (3) classification on the statement of cash flows. ASU 2016-19 also provides an accounting policy election to account for forfeitures as they occur. We adopted this guidance on January 1, 2017. The impact on the Company’s consolidated financial statements was not material due to the full valuation allowance on our deferred tax assets. We have elected to continue to estimate forfeitures expected to occur to determine the amount of compensation cost to be recognized each period.

Recent Accounting Pronouncements Not Yet Adopted

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, as amended which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers ( the “new revenue standard”). The new revenue standard will be effective on January 1, 2018 and early adoption is permitted. The standard permits the use of either a full retrospective or modified retrospective transition method.

The Company will adopt the new revenue standard as of January 1, 2018, using the modified retrospective transition method and is currently evaluating the expected impact of the adoption on its consolidated financial statements and related disclosures. Under the modified retrospective transition method, we will be required to calculate and record the cumulative effect of adopting the new revenue standard as an adjustment to our opening balance of our retained earnings on January 1, 2018, within our Quarterly Report on Form 10-Q for the first quarter of 2018. Prior periods will not be retrospectively adjusted.

Based on our ongoing assessment, we do not expect there will be a material impact on our revenue upon adoption. While we are continuing to assess all potential impacts of the standard, we believe the most significant impact relates to recognizing the costs of obtaining customer contracts. Under the Company's current policy election under GAAP, sales commissions and other incremental costs to acquire contracts are expensed as incurred. Under the new revenue standard, such costs will be deferred and recognized over a period of time. The Company is in the process of implementing the necessary changes to its accounting policies, processes, internal controls and information systems that will be required to meet the new standard’s reporting and disclosure requirements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). Under ASU 2016-02, an entity will be required to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. ASU 2016-02 offers specific accounting guidance for a lessee, a lessor and sale and leaseback transactions. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. For public companies, ASU 2016-02 is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, and requires a modified retrospective adoption, with early adoption permitted. We anticipate this standard will have a material impact on our consolidated financial statements. While we are continuing to assess all potential impacts of the standard, we currently believe the most significant impact relates to our accounting and reporting of our operating leases on our balance sheet.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"), which amends the current accounting guidance and requires the measurement of all expected losses based on historical experience, current conditions and reasonable and supportable forecasts. This guidance amends the accounting for credit losses for available-for-sale securities and purchased financial assets with credit deterioration. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods within those annual periods. Early adoption is permitted for any interim or annual period after December 15, 2018. We do not expect the adoption of this guidance to have a material impact on our financial condition, results of operations, cash flows or disclosures.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"), which provides cash flow statement classification guidance for debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. We have not determined the effect of this guidance on our statement of cash flows.

In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16"), which changes the timing of when certain intercompany transactions are recognized within the provision for income taxes. ASU 2016-16 is effective on January 1, 2018. Early adoption is permitted. We have not determined the effect of this guidance on our financial condition, results of operations, cash flows or disclosures.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash ("ASU 2016-18"), which provides amendments to current guidance to address the classification and presentation of changes in restricted cash in the statement of cash flows. ASU 2016-18 is effective on January 1, 2018 and early adoption is permitted. We are still evaluating the effect of this guidance on our financial statements. We expect that adoption will change the current presentation of restricted cash on our statement of cash flows as well as require additional disclosures to reconcile cash and cash equivalents per the balance sheet to cash and cash equivalents on the statement of cash flows.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ("ASU 2017-04"), which eliminates Step 2 from the goodwill impairment test. The annual, or interim, goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In addition, income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit should be considered when measuring the goodwill impairment loss, if applicable. ASU 2017-04 also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 is effective for public entities for fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on dates after January 1, 2017. We do not expect the adoption of this guidance to have a material impact on our financial condition, results of operations, cash flows or disclosures.

In March 2017, the FASB issued ASU No. 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities (“ASU 2017-08”). ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium. Specifically, ASU 2017-08 requires the premium to be amortized to the earliest call date. ASU 2017-08 does not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. For public companies, ASU 2017-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. The amendments should be applied on a modified retrospective basis, with a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We do not expect the adoption of this guidance to have a material impact on our financial condition, results of operations, cash flows or disclosures since our current accounting policy is in accordance with ASU 2017-08.

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting ("ASU 2017-09"). ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. The new guidance will reduce diversity in practice and result in fewer changes to the terms of an award being accounted for as modifications. Under ASU 2017-09, an entity will not apply modification accounting to a share-based payment award if the award’s fair value, vesting conditions and classification as an equity or liability instrument are the same immediately before and after the change. ASU 2017-09 will be applied prospectively to awards modified on or after the adoption date. The guidance is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted. We do not expect the adoption of this guidance to have a material impact on our financial condition, results of operations, cash flows or disclosures.

Investment Securities and Fair Value Measurements

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Investment Securities and Fair Value Measurements

Investment Securities

Investment securities classified as available-for-sale consisted of the following at September 30, 2017 and December 31, 2016 (in thousands):



	September 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Corporate bonds	$	34,558	$	11	$	(19	)	$	34,550
Agency securities	11,302		—		(17		)	11,285
Certificates of deposit	2,982		3		(1		)	2,984
Total available-for-sale investment securities	$	48,842	$	14	$	(37	)	$	48,819



	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Corporate bonds	$	30,492	$	9	$	(56	)	$	30,445
Agency securities	6,248		—		(20		)	6,228
Certificates of deposit	5,472		16		—			5,488
Total available-for-sale investment securities	$	42,212	$	25	$	(76	)	$	42,161

As of September 30, 2017, the unrealized losses on investment securities which have been in a net loss position for 12 months or greater were not material. These unrealized losses are considered temporary and there were no impairments considered to be "other-than-temporary" based on our evaluation of available evidence, which includes our intent to hold these investments to maturity or a recovery of the cost basis.

At September 30, 2017 and December 31, 2016, the contractual maturities of our investments did not exceed 36 months. The fair values of available-for-sale investments, by remaining contractual maturity, are as follows (in thousands):



	September 30, 2017				December 31, 2016
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in 1 year or less	$	28,398	$	28,396	$	15,475	$	15,473
Due after 1 year through 3 years	20,444		20,423		26,737		26,688
Total available-for-sale investment securities	$	48,842	$	48,819	$	42,212	$	42,161

During the nine months ended September 30, 2017 and 2016, we had sales and maturities (which includes calls) of investment securities, as follows (in thousands):



	Nine Months Ended September 30, 2017
	Gross Realized Gains		Gross Realized Losses		Gross Proceeds from Sales		Gross Proceeds from Maturities
Agency securities	$	1	$	—	$	15	$	1,044
Corporate bonds	—		—		—		7,440
Certificates of deposit	—		—		—		2,490
	$	1	$	—	$	15	$	10,974



	Nine Months Ended September 30, 2016
	Gross Realized Gains		Gross Realized Losses		Gross Proceeds from Sales		Gross Proceeds from Maturities
Agency securities	$	5	$	—	$	3,005	$	9,557
Corporate bonds	1		—		5,011		2,480
Treasury bills	—		—		2,000		3,830
Certificates of Deposit	—		—		—		1,245
	$	6	$	—	$	10,016	$	17,112

Interest income from investment securities, net of the amortization and accretion of the premium and discount, for the three months ended September 30, 2017 and 2016, was $0.2 million and $0.1 million, respectively and $0.5 million and $0.3 million for the nine months ended September 30, 2017 and 2016, respectively.

Fair Value Measurements

Recurring Fair Value Measurements

Financial assets and financial liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The following tables summarize our financial assets measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016, by level within the fair value hierarchy (in thousands):



	September 30, 2017
	Level 1		Level 2		Level 3		Total Fair Value
Cash equivalents:
Money market funds	$	3,910	$	—	$	—	$	3,910
Available-for-sale investment securities:
Corporate bonds	—		34,550		—		34,550
Agency securities	—		11,285		—		11,285
Certificates of deposit	2,984		—		—		2,984
Total	$	6,894	$	45,835	$	—	$	52,729



	December 31, 2016
	Level 1		Level 2		Level 3		Total Fair Value
Cash equivalents:
Money market funds	$	4,849	$	—	$	—	$	4,849
Available-for-sale investment securities:
Corporate bonds	—		30,445		—		30,445
Agency securities	—		6,228		—		6,228
Certificates of deposit	5,488		—		—		5,488
Total	$	10,337	$	36,673	$	—	$	47,010

The carrying amounts of cash equivalents, restricted cash, accounts receivable, accounts payable and accrued liabilities approximate fair value because of the short maturity of these items.

There were no changes to our valuation techniques used to measure asset and liability fair values on a recurring basis during the nine months ended September 30, 2017. The valuation techniques for the items in the table above are as follows:

Cash and Cash Equivalents

As of September 30, 2017 and December 31, 2016, cash and cash equivalents include cash invested in money market funds. Fair value is based on market prices for identical assets.

Available-for-Sale Investment Securities

The fair value of our investment securities and certificates of deposit is based on pricing determined using inputs other than quoted prices that are observable either directly or indirectly such as yield curve, volatility factors, credit spreads, default rates, loss severity, current market and contractual prices for the underlying instruments or debt, broker and dealer quotes, as well as other relevant economic measures.

Non-Recurring Fair Value Measurements

Certain assets, including goodwill, intangible assets and our note receivable with SecureDocs, are also subject to measurement at fair value on a non-recurring basis using Level 3 measurement when they are deemed to be impaired as a result of an impairment review. For the nine months ended September 30, 2017 and 2016, no impairments were identified on those assets required to be measured at fair value on a non-recurring basis.

Internal-Use Software Development Costs

9 Months Ended

Sep. 30, 2017

Research and Development [Abstract]

Internal-Use Software Development Costs

Internal-use software development costs were as follows (in thousands):



	September 30, 2017			December 31, 2016
Internal use software development costs, gross	$	41,902		$	33,545
Less: Accumulated amortization	(24,582		)	(18,006		)
Internal use software development costs, net	$	17,320		$	15,539

Capitalized software development costs were $2.9 million and $3.3 million for the three months ended September 30, 2017 and 2016, respectively, and were $8.4 million and $8.8 million for the nine months ended September 30, 2017 and 2016, respectively. Amortization expense with respect to software development costs totaled $2.3 million and $1.7 million for the three months ended September 30, 2017 and 2016, respectively, and $6.6 million and $4.4 million for the nine months ended September 30, 2017 and 2016, respectively.

Future amortization expense with respect to capitalized software development costs as of September 30, 2017, is estimated as follows (in thousands):



Years Ending December 31,
2017	$	2,409
2018	8,431
2019	5,153
2020	1,327
Total amortization expense	$	17,320

Intangible Assets

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets consisted of the following as of September 30, 2017 and December 31, 2016 (in thousands):



	September 30, 2017
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer relationships	$	790	$	(510	)	$	280
Technology	4,811		(3,671		)	1,140
Trademarks	930		(508		)	422
Partner relationships	680		(567		)	113
Non-compete agreements	40		(33		)	7
Domain names	273		(273		)	—
Patents	285		(193		)	92
	$	7,809	$	(5,755	)	$	2,054



	December 31, 2016
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer relationships	$	790	$	(392	)	$	398
Technology	4,811		(3,070		)	1,741
Trademarks	930		(416		)	514
Partner relationships	680		(397		)	283
Non-compete agreements	40		(23		)	17
Domain names	273		(241		)	32
Patents	284		(164		)	120
	$	7,808	$	(4,703	)	$	3,105

Amortization expense for the three months ended September 30, 2017 and 2016 was $0.4 million for each period and for the nine months ended September 30, 2017 and 2016 was $1.1 million for each period.

As of September 30, 2017, estimated future amortization of intangible assets was as follows (in thousands):



Years Ending December 31,
2017	$	329
2018	929
2019	352
2020	259
2021	124
Thereafter	61
Total amortization expense	$	2,054

Commitment and Contingencies	9 Months Ended
Commitment and Contingencies	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Obligations As of September 30, 2017, we had operating lease obligations of approximately $9.6 million through 2022. We recorded rent expense of $0.5 million for each three month period ended September 30, 2017 and 2016, and $1.5 million for each nine month period ended September 30, 2017 and 2016. In February 2017, we signed a lease amendment relating to the property located at 50 Castilian Drive in Santa Barbara, California, our corporate headquarters. This amendment extends the term from February 2018 to December 2021. The total commitment under this lease extension is $3.1 million. All of the other terms and conditions of the lease agreement remain the same. Line of Credit We are party to a Credit Agreement with Wells Fargo, as administrative agent, and the lenders that are parties thereto (as amended, the “Credit Agreement”). Under the terms of the Credit Agreement, the lenders made available to us a $25.0 million revolving line of credit (the “Revolving Facility”). Borrowings under the Revolving Facility are subject to the satisfaction of customary conditions. The Revolving Facility matures on October 9, 2020; however, we can make payments on, and cancel in full, the Revolving Facility at any time without premium or penalty. As of September 30, 2017 and December 31, 2016, there was no outstanding balance under the Credit Agreement and we are in compliance with the financial covenants under the Revolving Facility. Insurance We have a wholly owned subsidiary, Terra Mar Insurance Company, Inc. (“Terra Mar”), which was established to provide our customers with the option to purchase tenant liability insurance. If our customers choose to use our insurance services, they are issued an insurance policy underwritten by our third-party service provider. The policy has a limit of $100,000 per incident for each insured residence. We have entered into a reinsurance agreement with our third-party service provider and, as a result, we assume a 100% quota share of the tenant liability insurance provided to our customers through our third-party service provider. Included in cost of revenue we accrue for reported claims and an estimate of losses incurred but not reported by our property manager customers, as we bear the risk related to claims. Our liability for reported claims and incurred but not reported claims as of September 30, 2017 and December 31, 2016 was $0.4 million and $0.3 million, respectively, and is included in Other current liabilities on the Condensed Consolidated Balance Sheets. Included in Other assets as of September 30, 2017 and December 31, 2016, are $1.5 million and $1.2 million, respectively, of deposits held with a third party related to requirements to maintain collateral for our insurance services. Litigation From time to time, we may become subject to certain legal proceedings, including without limitation claims and/or litigation matters, arising in the ordinary course of business. We are not currently a party to any such legal proceedings, nor are we aware of any pending or threatened litigation, that we believe would have a material adverse effect on our business, operating results, cash flows or financial condition should such proceedings be resolved unfavorably. Indemnification In the ordinary course of business, we may provide indemnification of varying scope and terms to customers, investors, directors and officers with respect to certain matters, including, but not limited to, losses arising out of our breach of any applicable agreements, services to be provided by us, or intellectual property infringement claims made by third parties. These indemnification provisions may survive termination of the underlying agreement and the maximum potential amount of future payments we could be required to make under these indemnification provisions may not be subject to maximum loss clauses. The maximum potential amount of future payments we could be required to make under these indemnification provisions is indeterminable. We have never paid a material claim, nor have any legal claims been brought against us in connection with these indemnification arrangements. As of September 30, 2017 and December 31, 2016, we had not accrued a liability for these indemnification arrangements because we determined that the likelihood of incurring a payment obligation, if any, in connection with these indemnification arrangements is not probable or reasonably possible and the amount or range of amounts of any such liability is not reasonably estimable.

Stock-Based Compensation

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock Options

A summary of our stock option activity for the nine months ended September 30, 2017, is as follows (number of shares in thousands):



	Number of Shares		Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Life in Years
Options outstanding as of December 31, 2016	1,718		$	8.75	8.2
Options granted	172		24.77
Options exercised	(133	)	3.83
Options cancelled/forfeited	(29	)	9.84
Options outstanding as of September 30, 2017	1,728		$	10.70	7.9

During the nine months ended September 30, 2017, we granted PSOs to purchase up to 172,000 shares of our Class A common stock. The PSOs have a weighted average exercise price of $24.77 per share. Vesting of the PSOs is based on the achievement of pre-established performance metrics for the year ended December 31, 2019, and continued employment throughout the performance period. Of the PSOs granted during 2017, 132,000 shares would vest based upon the maximum payout of 165% when the 2019 free cash flow performance metric meets the maximum achievement of 150%. For performance at 100% of the targeted 2019 free cash flow metric, approximately 61% of the PSOs would vest. For performance at 80% of the targeted metric, approximately 48% of the PSOs would vest. For performance below 80% of the 2019 targeted metric, no PSOs would vest, all previously recognized compensation expense for the PSOs would be reversed, and no compensation expense would be recognized. The remaining 40,000 PSOs granted during 2017 have a pre-established adjusted gross margin target for 2019. PSOs tied to the gross margin performance metric have two levels of vesting, with 50% vesting based upon the achievement of 110% of the targeted amount and the remaining 50% vesting upon the achievement of 115% of the targeted amount. If the 110% performance target is not met, no shares will vest and all previously recognized expense for those PSOs would be reversed and no compensation expense would be recognized.

Included in the options outstanding as of September 30, 2017 are 500,000 PSOs granted in 2016, which vest based on the achievement of a pre-established free cash flow performance metric for the years ended December 31, 2017 and 2018. The number of PSOs granted in 2016 related to the performance metrics for the years ended December 31, 2017 and 2018, assumes achievement of the performance metric at the maximum level, which is 150% of the targeted performance metric. For performance at 100% of the targeted metric, approximately 67% of the PSOs would vest. For performance at 80% of the targeted metric, approximately 53% would vest. For performance below 50% of the 2017 targeted metric or 80% of the 2018 targeted metric, no PSOs would vest, all previously recognized compensation expense for PSOs would be reversed, and no compensation expense would be recognized.

During the nine months ended September 30, 2017, 247,000 of the PSOs vested based on the achievement of 148% of the pre-established free cash flow performance metric for the year ended December 31, 2016, and 3,000 PSOs were cancelled as a result of the PSOs being granted at 150% of the target metric. During the year ended December 31, 2016, $1.0 million of expense was recognized related to the PSOs that vested during the nine months ended September 30, 2017.

We recognize expense for the PSOs based on the grant date fair value of the PSOs that we determine are probable of vesting. Adjustments to compensation expense are made each period based on changes in our estimate of the number of PSOs that are probable of vesting. Our stock-based compensation expense for stock options, including the PSOs, for the three months ended September 30, 2017 and 2016, was $0.7 million and $0.7 million, respectively, and $2.0 million and $1.6 million for the nine months ended September 30, 2017 and 2016, respectively.

The fair value of stock options granted is estimated on the date of grant using the Black-Scholes option-pricing model. The following table summarizes information relating to our stock options granted during the three and nine months ended September 30, 2017 and 2016:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Stock options granted (in thousands)	—			—			172			750
Weighted average exercise price per share	$	—		$	—		$	24.77		$	12.85
Weighted average grant-date fair value per share	$	—		$	—		$	9.58		$	4.85
Weighted average Black-Scholes model assumptions:
Risk-free interest rate	—		%	—		%	2.02		%	1.45		%
Expected term (in years)	—			—			6.4			5.9
Expected volatility	—		%	—		%	35		%	37		%
Expected dividend yield	—			—			—			—

As of September 30, 2017, the total estimated remaining stock-based compensation expense for unvested stock options, including the PSOs, was $2.7 million, which is expected to be recognized over a weighted average period of 1.5 years.

Restricted Stock Units

A summary of activity in connection with our RSUs for the nine months ended September 30, 2017, is as follows (number of shares in thousands):



	Number of Shares		Weighted- Average Grant Date Fair Value per Share
Unvested as of December 31, 2016	496		$	13.34
Granted	307		25.64
Vested	(139	)	12.81
Forfeited	(46	)	16.17
Unvested as of September 30, 2017	618		$	19.36

During the nine months ended September 30, 2017, we granted a total of 307,000 RSUs: 194,000 RSUs vest annually over four years; 100,000 PSUs vest based upon achievement of a pre-established free cash flow performance metric for the year ended December 31, 2019, and continued employment throughout the performance period; and 13,000 PSUs were granted and vested as a result of the attainment of the 2016 performance metric. The number of PSUs granted, as included in the above table, assumes achievement of the performance metric at 100% of the targeted performance metric. The actual number of shares to be issued at the end of the performance period will range from 0% to 165% of the initial target awards. For performance at 150% of the targeted metric in 2019, 165% of the PSUs would vest. For performance below 80% of the targeted metric in 2019, no PSUs would vest and no compensation expense would be recognized, and all previously recognized compensation expense for PSUs would be reversed.

During the nine months ended September 30, 2017, 41,000 of the PSUs vested based on the achievement of 148% of the pre-established free cash flow performance metric for the year ended December 31, 2016, and an additional 13,000 PSUs were granted and vested as a result of the attainment of the 2016 performance metric as approved by our Board of Directors. During the year ended December 31, 2016, $479,000 of expense was recognized related to the PSUs vested during the nine months ended September 30, 2017.

Included in the unvested RSUs as of September 30, 2017 are 56,000 PSUs granted in 2016, which vest based on the achievement of a pre-established free cash flow performance metric for the years ended December 31, 2017 and 2018, and continued employment throughout the performance period. The number of PSUs granted in 2016 related to the performance metrics for the years ended December 31, 2017 and 2018, and assumed achievement of the performance metric at 100% of the targeted performance metric. The actual number of shares to be issued at the end of the performance period will range from 0% to 150% of the initial target awards. For performance at 150% of the targeted metric, 150% of the PSUs would vest. For performance below 50% of the targeted metric for 2017 or 80% of the targeted metric for 2018, no PSUs would vest and no compensation expense would be recognized, and all previously recognized compensation expense for PSUs would be reversed.

We recognize expense for the PSUs based on the grant date fair value of the PSUs that we determine are probable of vesting. Adjustments to compensation expense are made each period based on changes in our estimate of the number of PSUs that are probable of vesting. Our stock-based compensation expense for the RSUs and PSUs for the three months ended September 30, 2017 and 2016, was $1.0 million and $571,000, respectively, and $2.6 million and $1.2 million for the nine months ended September 30, 2017 and 2016, respectively.

As of September 30, 2017, the total remaining estimated stock-based compensation expense for the RSUs and PSUs was $9.2 million, which is expected to be recognized over a weighted average period of 2.6 years.

Restricted Stock Awards

A summary of activity in connection with our restricted stock awards for the nine months ended September 30, 2017, follows (number of shares in thousands):



	Number of Shares		Weighted-Average Grant Date Fair Value per Share
Unvested as of December 31, 2016	46		$	8.55
Granted	9		33.30
Vested	(38	)	9.33
Forfeited	—		—
Unvested as of September 30, 2017	17		$	19.79

We have the right to repurchase any unvested restricted stock awards. Restricted stock awards vest over a four-year period for employees and a one-year period for non-employee directors. We recognized stock-based compensation expense for restricted stock awards of $84,000 and $113,000 for the three months ended September 30, 2017 and 2016, respectively, and $274,000 and $342,000 for the nine months ended September 30, 2017 and 2016, respectively.

As of September 30, 2017, the total remaining stock-based compensation expense for unvested restricted stock awards with a repurchasing right was $268,000 which is expected to be recognized over a weighted average period of 0.8 years.

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective tax rate differs from the U.S. Federal statutory rate of 34% primarily because our previously reported losses have been offset by a valuation allowance due to uncertainty as to the realization of those losses. For the three and nine months ended September 30, 2017, we recorded income tax expense of $52,000 and $93,000, respectively, on pre-tax income of $3.7 million and $7.2 million, respectively, for an effective tax rate of 1.4% and 1.3%, respectively. The income tax expense is based on our payments of state minimum taxes, alternative minimum tax ("AMT") (net of available AMT credit), and the amortization of tax deductible goodwill that is not an available source of income to realize the deferred tax asset. For the three and nine months ended September 30, 2016, we recorded income tax expense of $11,000 and $48,000, respectively, on pre-tax losses of $1.1 million and $6.9 million, respectively for an effective tax rate of (1.0)% and (0.7)%, respectively. The income tax expense is based on our payments of state minimum taxes and the amortization of tax deductible goodwill that is not an available source of income to realize the deferred tax asset.

Revenue and Other Information

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Revenue and Other Information

The following table presents our revenue categories for the three and nine months ended September 30, 2017 and 2016 (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Core solutions	$	14,670	$	11,302	$	41,682	$	31,637
Value+ services	21,752		15,684		60,053		42,338
Other	1,481		1,176		4,171		3,601
Total revenues	$	37,903	$	28,162	$	105,906	$	77,576

Core solutions revenue includes our subscription fees which are designed to scale to the size of our customers’ businesses. We recognize subscription revenue ratably over the terms of the subscription agreements, which typically range from one month to one year. Revenue from subscription services is impacted by a number of factors, including the change in the number and type of our customers, the size and needs of our customers’ businesses, and our customer renewal rates.

Value+ services revenue includes subscriptions and usage-based fees. Subscription Value+ services include website hosting services and contact center services. Usage-based Value+ services include fees for electronic payment processing, applicant screening services, our tenant liability insurance program, collections, and online vacancy advertising services. Revenue from Value+ services is impacted by a number of factors, including the number of new and existing customers that adopt and utilize our Value+ service, the size and needs of our customers and our customer renewal rates.

Other revenue includes revenue from one-time services related to on-boarding customers to our core solutions, website design services and online vacancy advertising services offered to legacy RentLinx customers.

Our revenue is generated primarily from U.S. customers. All of our property and equipment is located in the U.S.

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies The accompanying unaudited Condensed Consolidated Financial Statements were prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. Accordingly, these Condensed Consolidated Financial Statements should be read in conjunction with our audited consolidated financial statements and the related notes included in our Annual Report filed with the SEC on February 27, 2017. The year-end condensed balance sheet was derived from our audited consolidated financial statements. Our unaudited interim Condensed Consolidated Financial Statements have been prepared on a basis consistent with that used to prepare our audited annual consolidated financial statements and include, in the opinion of management, all adjustments, consisting of normal and recurring items, necessary for the fair statement of the Condensed Consolidated Financial Statements. The operating results for the nine months ended September 30, 2017, are not necessarily indicative of the results expected for the full year ending December 31, 2017.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the dates of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates. On an ongoing basis, management evaluates its estimates based on historical data and experience, as well as various other factors that management believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources.
Recently Adopted and Not Yet Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements Under the Jumpstart our Business Startups Act (the “JOBS Act”), we meet the definition of an emerging growth company. We have irrevocably elected to opt out of the extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act. In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-09, Compensation - Stock Compensation (Topic 781), Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), which amends and simplifies the accounting for share-based payment awards in three areas: (1) income tax consequences, (2) classification of awards as either equity or liabilities, and (3) classification on the statement of cash flows. ASU 2016-19 also provides an accounting policy election to account for forfeitures as they occur. We adopted this guidance on January 1, 2017. The impact on the Company’s consolidated financial statements was not material due to the full valuation allowance on our deferred tax assets. We have elected to continue to estimate forfeitures expected to occur to determine the amount of compensation cost to be recognized each period. Recent Accounting Pronouncements Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, as amended which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers ( the “new revenue standard”). The new revenue standard will be effective on January 1, 2018 and early adoption is permitted. The standard permits the use of either a full retrospective or modified retrospective transition method. The Company will adopt the new revenue standard as of January 1, 2018, using the modified retrospective transition method and is currently evaluating the expected impact of the adoption on its consolidated financial statements and related disclosures. Under the modified retrospective transition method, we will be required to calculate and record the cumulative effect of adopting the new revenue standard as an adjustment to our opening balance of our retained earnings on January 1, 2018, within our Quarterly Report on Form 10-Q for the first quarter of 2018. Prior periods will not be retrospectively adjusted. Based on our ongoing assessment, we do not expect there will be a material impact on our revenue upon adoption. While we are continuing to assess all potential impacts of the standard, we believe the most significant impact relates to recognizing the costs of obtaining customer contracts. Under the Company's current policy election under GAAP, sales commissions and other incremental costs to acquire contracts are expensed as incurred. Under the new revenue standard, such costs will be deferred and recognized over a period of time. The Company is in the process of implementing the necessary changes to its accounting policies, processes, internal controls and information systems that will be required to meet the new standard’s reporting and disclosure requirements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). Under ASU 2016-02, an entity will be required to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. ASU 2016-02 offers specific accounting guidance for a lessee, a lessor and sale and leaseback transactions. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. For public companies, ASU 2016-02 is effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, and requires a modified retrospective adoption, with early adoption permitted. We anticipate this standard will have a material impact on our consolidated financial statements. While we are continuing to assess all potential impacts of the standard, we currently believe the most significant impact relates to our accounting and reporting of our operating leases on our balance sheet. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"), which amends the current accounting guidance and requires the measurement of all expected losses based on historical experience, current conditions and reasonable and supportable forecasts. This guidance amends the accounting for credit losses for available-for-sale securities and purchased financial assets with credit deterioration. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods within those annual periods. Early adoption is permitted for any interim or annual period after December 15, 2018. We do not expect the adoption of this guidance to have a material impact on our financial condition, results of operations, cash flows or disclosures. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"), which provides cash flow statement classification guidance for debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. We have not determined the effect of this guidance on our statement of cash flows. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16"), which changes the timing of when certain intercompany transactions are recognized within the provision for income taxes. ASU 2016-16 is effective on January 1, 2018. Early adoption is permitted. We have not determined the effect of this guidance on our financial condition, results of operations, cash flows or disclosures. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash ("ASU 2016-18"), which provides amendments to current guidance to address the classification and presentation of changes in restricted cash in the statement of cash flows. ASU 2016-18 is effective on January 1, 2018 and early adoption is permitted. We are still evaluating the effect of this guidance on our financial statements. We expect that adoption will change the current presentation of restricted cash on our statement of cash flows as well as require additional disclosures to reconcile cash and cash equivalents per the balance sheet to cash and cash equivalents on the statement of cash flows. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ("ASU 2017-04"), which eliminates Step 2 from the goodwill impairment test. The annual, or interim, goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In addition, income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit should be considered when measuring the goodwill impairment loss, if applicable. ASU 2017-04 also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 is effective for public entities for fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on dates after January 1, 2017. We do not expect the adoption of this guidance to have a material impact on our financial condition, results of operations, cash flows or disclosures. In March 2017, the FASB issued ASU No. 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities (“ASU 2017-08”). ASU 2017-08 shortens the amortization period for certain callable debt securities held at a premium. Specifically, ASU 2017-08 requires the premium to be amortized to the earliest call date. ASU 2017-08 does not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. For public companies, ASU 2017-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. The amendments should be applied on a modified retrospective basis, with a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We do not expect the adoption of this guidance to have a material impact on our financial condition, results of operations, cash flows or disclosures since our current accounting policy is in accordance with ASU 2017-08. In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting ("ASU 2017-09"). ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. The new guidance will reduce diversity in practice and result in fewer changes to the terms of an award being accounted for as modifications. Under ASU 2017-09, an entity will not apply modification accounting to a share-based payment award if the award’s fair value, vesting conditions and classification as an equity or liability instrument are the same immediately before and after the change. ASU 2017-09 will be applied prospectively to awards modified on or after the adoption date. The guidance is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. Early adoption is permitted. We do not expect the adoption of this guidance to have a material impact on our financial condition, results of operations, cash flows or disclosures.

Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Schedule of Weighted Average Number of Shares

The following table presents a reconciliation of our weighted average number of Class A and Class B common shares used to compute net income (loss) per share (in thousands):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2017	2016	2017	2016
Weighted average shares outstanding	33,923	33,668	33,848	33,617
Less: Weighted average unvested restricted shares subject to repurchase	18	68	31	88
Weighted average common shares outstanding; basic	33,905	33,600	33,817	33,529

Weighted average common shares outstanding; basic	33,905	33,600	33,817	33,529
Plus: Weighted average options, RSUs and restricted shares used to compute diluted net income per share	1,300	—	1,274	—
Weighted average common shares outstanding; diluted	35,205	33,600	35,091	33,529

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table presents the number of anti-dilutive common shares excluded from the calculation of weighted average number of shares used to compute diluted net income (loss) per share for the three and nine months ended September 30, 2017 and 2016 (in thousands):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2017	2016	2017	2016
Options to purchase common stock	—	1,764	—	1,764
Unvested restricted stock awards	—	59	—	59
Unvested restricted stock units	13	480	13	480
Contingent restricted stock units⁽¹⁾	6	27	6	27
Total shares excluded from net income (loss) per common share	19	2,330	19	2,330

Investment Securities and Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of Available-for-sale Securities

Investment securities classified as available-for-sale consisted of the following at September 30, 2017 and December 31, 2016 (in thousands):



	September 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Corporate bonds	$	34,558	$	11	$	(19	)	$	34,550
Agency securities	11,302		—		(17		)	11,285
Certificates of deposit	2,982		3		(1		)	2,984
Total available-for-sale investment securities	$	48,842	$	14	$	(37	)	$	48,819



	December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Corporate bonds	$	30,492	$	9	$	(56	)	$	30,445
Agency securities	6,248		—		(20		)	6,228
Certificates of deposit	5,472		16		—			5,488
Total available-for-sale investment securities	$	42,212	$	25	$	(76	)	$	42,161

Available-for-sale Investments, by Remaining Contract Maturity



	September 30, 2017				December 31, 2016
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in 1 year or less	$	28,398	$	28,396	$	15,475	$	15,473
Due after 1 year through 3 years	20,444		20,423		26,737		26,688
Total available-for-sale investment securities	$	48,842	$	48,819	$	42,212	$	42,161

Schedule of Sales, Calls, and Maturities

During the nine months ended September 30, 2017 and 2016, we had sales and maturities (which includes calls) of investment securities, as follows (in thousands):



	Nine Months Ended September 30, 2017
	Gross Realized Gains		Gross Realized Losses		Gross Proceeds from Sales		Gross Proceeds from Maturities
Agency securities	$	1	$	—	$	15	$	1,044
Corporate bonds	—		—		—		7,440
Certificates of deposit	—		—		—		2,490
	$	1	$	—	$	15	$	10,974



	Nine Months Ended September 30, 2016
	Gross Realized Gains		Gross Realized Losses		Gross Proceeds from Sales		Gross Proceeds from Maturities
Agency securities	$	5	$	—	$	3,005	$	9,557
Corporate bonds	1		—		5,011		2,480
Treasury bills	—		—		2,000		3,830
Certificates of Deposit	—		—		—		1,245
	$	6	$	—	$	10,016	$	17,112

Fair Value, Assets Measured on Recurring Basis

The following tables summarize our financial assets measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016, by level within the fair value hierarchy (in thousands):



	September 30, 2017
	Level 1		Level 2		Level 3		Total Fair Value
Cash equivalents:
Money market funds	$	3,910	$	—	$	—	$	3,910
Available-for-sale investment securities:
Corporate bonds	—		34,550		—		34,550
Agency securities	—		11,285		—		11,285
Certificates of deposit	2,984		—		—		2,984
Total	$	6,894	$	45,835	$	—	$	52,729



	December 31, 2016
	Level 1		Level 2		Level 3		Total Fair Value
Cash equivalents:
Money market funds	$	4,849	$	—	$	—	$	4,849
Available-for-sale investment securities:
Corporate bonds	—		30,445		—		30,445
Agency securities	—		6,228		—		6,228
Certificates of deposit	5,488		—		—		5,488
Total	$	10,337	$	36,673	$	—	$	47,010

Internal-Use Software Development Costs (Tables)

9 Months Ended

Sep. 30, 2017

Research and Development [Abstract]

Schedule of Capitalized Computer Software

Internal-use software development costs were as follows (in thousands):



	September 30, 2017			December 31, 2016
Internal use software development costs, gross	$	41,902		$	33,545
Less: Accumulated amortization	(24,582		)	(18,006		)
Internal use software development costs, net	$	17,320		$	15,539

Schedule of Capitalized Computer Software Future Amortization Expense

Future amortization expense with respect to capitalized software development costs as of September 30, 2017, is estimated as follows (in thousands):



Years Ending December 31,
2017	$	2,409
2018	8,431
2019	5,153
2020	1,327
Total amortization expense	$	17,320

Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

Intangible assets consisted of the following as of September 30, 2017 and December 31, 2016 (in thousands):



	September 30, 2017
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer relationships	$	790	$	(510	)	$	280
Technology	4,811		(3,671		)	1,140
Trademarks	930		(508		)	422
Partner relationships	680		(567		)	113
Non-compete agreements	40		(33		)	7
Domain names	273		(273		)	—
Patents	285		(193		)	92
	$	7,809	$	(5,755	)	$	2,054



	December 31, 2016
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Customer relationships	$	790	$	(392	)	$	398
Technology	4,811		(3,070		)	1,741
Trademarks	930		(416		)	514
Partner relationships	680		(397		)	283
Non-compete agreements	40		(23		)	17
Domain names	273		(241		)	32
Patents	284		(164		)	120
	$	7,808	$	(4,703	)	$	3,105

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

As of September 30, 2017, estimated future amortization of intangible assets was as follows (in thousands):



Years Ending December 31,
2017	$	329
2018	929
2019	352
2020	259
2021	124
Thereafter	61
Total amortization expense	$	2,054

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Option Activity

A summary of our stock option activity for the nine months ended September 30, 2017, is as follows (number of shares in thousands):



	Number of Shares		Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Life in Years
Options outstanding as of December 31, 2016	1,718		$	8.75	8.2
Options granted	172		24.77
Options exercised	(133	)	3.83
Options cancelled/forfeited	(29	)	9.84
Options outstanding as of September 30, 2017	1,728		$	10.70	7.9

Schedule of Valuation Assumptions, Stock Options

The following table summarizes information relating to our stock options granted during the three and nine months ended September 30, 2017 and 2016:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Stock options granted (in thousands)	—			—			172			750
Weighted average exercise price per share	$	—		$	—		$	24.77		$	12.85
Weighted average grant-date fair value per share	$	—		$	—		$	9.58		$	4.85
Weighted average Black-Scholes model assumptions:
Risk-free interest rate	—		%	—		%	2.02		%	1.45		%
Expected term (in years)	—			—			6.4			5.9
Expected volatility	—		%	—		%	35		%	37		%
Expected dividend yield	—			—			—			—

Schedule of Restricted Stock Units Activity

A summary of activity in connection with our RSUs for the nine months ended September 30, 2017, is as follows (number of shares in thousands):



	Number of Shares		Weighted- Average Grant Date Fair Value per Share
Unvested as of December 31, 2016	496		$	13.34
Granted	307		25.64
Vested	(139	)	12.81
Forfeited	(46	)	16.17
Unvested as of September 30, 2017	618		$	19.36

Schedule of Restricted Stock Awards Activity

A summary of activity in connection with our restricted stock awards for the nine months ended September 30, 2017, follows (number of shares in thousands):



	Number of Shares		Weighted-Average Grant Date Fair Value per Share
Unvested as of December 31, 2016	46		$	8.55
Granted	9		33.30
Vested	(38	)	9.33
Forfeited	—		—
Unvested as of September 30, 2017	17		$	19.79

Revenue and Other Information (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Schedule of Product Information by Revenue Categories

The following table presents our revenue categories for the three and nine months ended September 30, 2017 and 2016 (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Core solutions	$	14,670	$	11,302	$	41,682	$	31,637
Value+ services	21,752		15,684		60,053		42,338
Other	1,481		1,176		4,171		3,601
Total revenues	$	37,903	$	28,162	$	105,906	$	77,576

Summary of Significant Accounting Policies - Net (Income) Loss per Share Schedule of Weighted Average Number of Shares (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares outstanding (in shares)	33,923	33,668	33,848	33,617
Less: Weighted average unvested restricted shares subject to repurchase (in shares)	18	68	31	88
Weighted average common shares outstanding; basic (in shares)	33,905	33,600	33,817	33,529
Weighted average common shares outstanding; basic (in shares)	33,905	33,600	33,817	33,529
Plus: Weighted average options, RSUs and restricted shares used to compute diluted net income per share (in shares)	1,300	0	1,274	0
Weighted average common shares outstanding; diluted (in shares)	35,205	33,600	35,091	33,529
Shares excluded from net loss per share attributable to common stockholders (in shares)	19	2,330	19	2,330
PSUs and PBOs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from net loss per share attributable to common stockholders (in shares)	571		571

Summary of Significant Accounting Policies - Net (Income) Loss Schedule of Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from net income (loss) per common share (in shares)	19	2,330	19	2,330
Common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from net income (loss) per common share (in shares)	0	1,764	0	1,764
Unvested restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from net income (loss) per common share (in shares)	0	59	0	59
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from net income (loss) per common share (in shares)	13	480	13	480
Contingent restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from net income (loss) per common share (in shares)	6	27	6	27

Investment Securities and Fair Value Measurements - Investment Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 48,842	$ 42,212
Gross Unrealized Gains	14	25
Gross Unrealized Losses	(37)	(76)
Estimated Fair Value	$ 48,819	$ 42,161
Maximum contractual maturity period	36 months	36 months
Amortized Cost
Due in 1 year or less	$ 28,398	$ 15,475
Due after 1 year through 3 years	20,444	26,737
Total available-for-sale investment securities	48,842	42,212
Estimated Fair Value
Due in 1 year or less	28,396	15,473
Due after 1 year through 3 years	20,423	26,688
Total available-for-sale investment securities	48,819	42,161
Corporate bonds
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	34,558	30,492
Gross Unrealized Gains	11	9
Gross Unrealized Losses	(19)	(56)
Estimated Fair Value	34,550	30,445
Agency securities
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	11,302	6,248
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(17)	(20)
Estimated Fair Value	11,285	6,228
Certificates of deposit
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	2,982	5,472
Gross Unrealized Gains	3	16
Gross Unrealized Losses	(1)	0
Estimated Fair Value	$ 2,984	$ 5,488

Investment Securities and Fair Value Measurements - Sales, Calls and Maturities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Gross Realized Gains			$ 1	$ 6
Gross Realized Losses			0	0
Gross Proceeds from Sales			15	10,016
Gross Proceeds from Maturities			10,974	17,112
Accretion (amortization) of discounts and premiums	$ 200	$ 100	500	300
Agency securities
Schedule of Available-for-sale Securities [Line Items]
Gross Realized Gains			1	5
Gross Realized Losses			0	0
Gross Proceeds from Sales			15	3,005
Gross Proceeds from Maturities			1,044	9,557
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Gross Realized Gains			0	1
Gross Realized Losses			0	0
Gross Proceeds from Sales			0	5,011
Gross Proceeds from Maturities			7,440	2,480
Treasury bills
Schedule of Available-for-sale Securities [Line Items]
Gross Realized Gains				0
Gross Realized Losses				0
Gross Proceeds from Sales				2,000
Gross Proceeds from Maturities				3,830
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Gross Realized Gains			0	0
Gross Realized Losses			0	0
Gross Proceeds from Sales			0	0
Gross Proceeds from Maturities			$ 2,490	$ 1,245

Investment Securities and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	$ 48,819	$ 42,161
Fair value measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	52,729	47,010
Fair value measurements \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	6,894	10,337
Fair value measurements \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	45,835	36,673
Fair value measurements \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0	0
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	34,550	30,445
Corporate bonds \| Fair value measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	34,550	30,445
Corporate bonds \| Fair value measurements \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	0	0
Corporate bonds \| Fair value measurements \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	34,550	30,445
Corporate bonds \| Fair value measurements \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	0	0
Agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	11,285	6,228
Agency securities \| Fair value measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	11,285	6,228
Agency securities \| Fair value measurements \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	0	0
Agency securities \| Fair value measurements \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	11,285	6,228
Agency securities \| Fair value measurements \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	0	0
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	2,984	5,488
Certificates of deposit \| Fair value measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	2,984	5,488
Certificates of deposit \| Fair value measurements \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	2,984	5,488
Certificates of deposit \| Fair value measurements \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	0	0
Certificates of deposit \| Fair value measurements \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale - investment securities	0	0
Money market funds \| Fair value measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,910	4,849
Money market funds \| Fair value measurements \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,910	4,849
Money market funds \| Fair value measurements \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Money market funds \| Fair value measurements \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 0	$ 0

Internal-Use Software Development Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Research and Development [Abstract]
Internal use software development costs, gross	$ 41,902		$ 41,902		$ 33,545
Less: Accumulated amortization	(24,582)		(24,582)		(18,006)
Internal use software development costs, net	17,320		17,320		$ 15,539
Capitalized software development costs during the period	2,900	$ 3,300	8,400	$ 8,800
Amortization expense with respect to software development costs during the period	$ 2,300	$ 1,700	$ 6,600	$ 4,400

Internal-Use Software Development Costs - Capitalized Computer Software Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Research and Development [Abstract]
2017	$ 2,409
2018	8,431
2019	5,153
2020	1,327
Internal use software development costs, net	$ 17,320	$ 15,539

Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 7,809		$ 7,809		$ 7,808
Accumulated Amortization	(5,755)		(5,755)		(4,703)
Net Carrying Value	2,054		2,054		3,105
Amortization expense	400	$ 400	1,100	$ 1,100
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	790		790		790
Accumulated Amortization	(510)		(510)		(392)
Net Carrying Value	280		280		398
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,811		4,811		4,811
Accumulated Amortization	(3,671)		(3,671)		(3,070)
Net Carrying Value	1,140		1,140		1,741
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	930		930		930
Accumulated Amortization	(508)		(508)		(416)
Net Carrying Value	422		422		514
Partner relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	680		680		680
Accumulated Amortization	(567)		(567)		(397)
Net Carrying Value	113		113		283
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	40		40		40
Accumulated Amortization	(33)		(33)		(23)
Net Carrying Value	7		7		17
Domain names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	273		273		273
Accumulated Amortization	(273)		(273)		(241)
Net Carrying Value	0		0		32
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	285		285		284
Accumulated Amortization	(193)		(193)		(164)
Net Carrying Value	$ 92		$ 92		$ 120

Intangible Assets - Future Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017	$ 329
2018	929
2019	352
2020	259
2021	124
Thereafter	61
Net Carrying Value	$ 2,054	$ 3,105

Commitment and Contingencies (Details) - USD ($)	3 Months Ended		9 Months Ended
Commitment and Contingencies (Details) - USD ($)	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Feb. 27, 2017	Dec. 31, 2016	Oct. 09, 2015
Loss Contingencies [Line Items]
Operating lease obligations	$ 9,600,000		$ 9,600,000		$ 3,100,000
Rent expense	500,000	$ 500,000	1,500,000	$ 1,500,000
Per incident policy limit			$ 100,000
Quota share of tenant liability insurance provided, percent			100.00%
Other current liabilities
Loss Contingencies [Line Items]
Liability for reported claims and claims incurred but not reported	400,000		$ 400,000			$ 300,000
Prepaid expenses and other current assets
Loss Contingencies [Line Items]
Deposits held with a third party related to insurance services collateral	1,500,000		1,500,000			1,200,000
Credit Facility \| Revolving Facility
Loss Contingencies [Line Items]
Maximum borrowing capacity							$ 25,000,000.0
Credit Facility \| Term Loan
Loss Contingencies [Line Items]
Line of credit, amount outstanding	$ 0		$ 0			$ 0

Stock-Based Compensation - Stock Option Activity (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning balance (shares)			1,718,000
Options granted (shares)	0	0	172,000	750,000
Options exercised (in shares)			(133,000)
Options canceled/forfeited (shares)			(29,000)
Options outstanding, ending balance (shares)	1,728,000		1,728,000		1,718,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options outstanding, weighted average exercise price, beginning balance (usd per share)			$ 8.75
Options granted, weighted average exercise price (usd per share)	$ 0.00	$ 0.00	24.77	$ 12.85
Options exercised, weighted average exercise price (usd per share)			3.83
Options canceled/forfeited, weighted average exercise price (usd per share)			9.84
Options outstanding, weighted average exercise price, ending balance (usd per share)	$ 10.70		$ 10.70		$ 8.75
Weighted average remaining contractual life, in years			7 years 10 months 24 days		8 years 2 months 12 days
Stock Options and PSOs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock-based compensation expense	$ 700,000	$ 700,000	$ 2,000,000	$ 1,600,000
PSOs \| Vesting Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted awards that will vest	110.00%		110.00%
PSOs \| Vesting Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted awards that will vest	115.00%		115.00%
2019 Performance Metric \| PSOs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options granted (shares)			172,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options granted, weighted average exercise price (usd per share)			$ 24.77
2019 Performance Metric \| PSOs \| Vesting Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options granted (shares)			40,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	50.00%		50.00%
Percent of targeted awards that will vest	50.00%		50.00%
2019 Performance Metric \| PSOs \| Vesting Tranche Six
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Share-based compensation options vested in period (shares)			0
Percent of targeted awards that will vest	110.00%		110.00%
2019 Performance Metric, Targeted Free Cash Flow Performance Metric \| PSOs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options granted (shares)			132,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	165.00%		165.00%
Percent of targeted awards that will vest	150.00%		150.00%
2019 Performance Metric, Targeted Free Cash Flow Performance Metric \| PSOs \| Vesting Tranche One
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	100.00%		100.00%
Percent of targeted awards that will vest	61.00%		61.00%
2019 Performance Metric, Targeted Free Cash Flow Performance Metric \| PSOs \| Vesting Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	80.00%		80.00%
Percent of targeted awards that will vest	48.00%		48.00%
2019 Performance Metric, Targeted Free Cash Flow Performance Metric \| PSOs \| Vesting Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	80.00%		80.00%
Share-based compensation options vested in period (shares)			0
Stock-based compensation expense			$ 0
2017 and 2018 Performance Metric \| PSOs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options granted (shares)			500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	150.00%		150.00%
2017 and 2018 Performance Metric \| PSOs \| Vesting Tranche One
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	100.00%		100.00%
Percent of targeted awards that will vest	67.00%		67.00%
2017 and 2018 Performance Metric \| PSOs \| Vesting Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	80.00%		80.00%
Percent of targeted awards that will vest	53.00%		53.00%
2017 and 2018 Performance Metric \| PSOs \| Vesting Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	80.00%		80.00%
Share-based compensation options vested in period (shares)			0
Stock-based compensation expense			$ 0
2017 and 2018 Performance Metric \| PSOs \| Vesting Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	50.00%		50.00%
2016 Performance Metric \| PSOs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options canceled/forfeited (shares)			(3,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Percent of targeted performance metric	150.00%		150.00%
Stock-based compensation expense					$ 1,000,000
Share-based compensation options vested (shares)			247,000
Percent of achievement of award target performance metric	148.00%		148.00%

Stock-Based Compensation - Valuation Assumptions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (shares)	0	0	172	750
Options granted, weighted average exercise price (usd per share)	$ 0.00	$ 0.00	$ 24.77	$ 12.85
Weighted average grant-date fair value per share (usd per share)	$ 0.00	$ 0.00	$ 9.58	$ 4.85
Stock Options and PSOs
Weighted average Black-Scholes model assumptions:
Risk-free interest rate	0.00%	0.00%	2.02%	1.45%
Expected term (in years)	0 years	0 years	6 years 4 months 24 days	5 years 10 months 24 days
Expected volatility	0.00%	0.00%	35.00%	37.00%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Remaining stock-based compensation expense for unvested options, not yet recognized	$ 2.7		$ 2.7
Stock-based compensation expense, weighted average recognition period			1 year 5 months 18 days

Stock-Based Compensation - Restricted Stock Units Activity (Details) - RSUs and PSUs	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Number of Shares
Unvested, beginning balance (shares) \| shares	496,000
Granted (shares) \| shares	307,000
Vested (shares) \| shares	(139,000)
Forfeited (shares) \| shares	(46,000)
Unvested, ending balance (shares) \| shares	618,000
Weighted- Average Grant Date Fair Value per Share
Unvested, beginning balance (usd per share) \| $ / shares	$ 13.34
Granted (usd per share) \| $ / shares	25.64
Vested (usd per share) \| $ / shares	12.81
Forfeited (usd per share) \| $ / shares	16.17
Unvested, ending balance (usd per share) \| $ / shares	$ 19.36

Stock-Based Compensation - Restricted Stock Units (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in period (shares)			307,000
Share-based compensation options vested in period (shares)			139,000
Stock-based compensation expense	$ 1,000,000	$ 571,000	$ 2,600,000	$ 1,200,000
Remaining stock-based compensation expense for unvested shares, not yet recognized	$ 9,200,000		$ 9,200,000
Stock-based compensation expense, weighted average recognition period			2 years 7 months 18 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in period (shares)			194,000
Vesting period			4 years
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in period (shares)			100,000		56,000
Percent of targeted performance metric	100.00%		100.00%		100.00%
Share-based compensation options vested in period (shares)			41,000
Stock-based compensation expense					$ 479,000
Percent of achievement of award target performance metric	148.00%		148.00%
PSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of targeted performance metric	0.00%		0.00%		0.00%
PSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of targeted performance metric	165.00%		165.00%		150.00%
PSUs \| Vesting Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of targeted performance metric	150.00%		150.00%		150.00%
Percent of targeted awards that will vest	165.00%		165.00%		150.00%
PSUs \| Vesting Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of targeted performance metric	80.00%		80.00%
Share-based compensation options vested in period (shares)			0
Stock-based compensation expense			$ 0
PSUs \| Vesting Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of targeted performance metric					80.00%
PSUs \| Vesting Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of targeted performance metric					50.00%
Share-based compensation options vested in period (shares)			0
Stock-based compensation expense					$ 0
2016 Performance Metric \| PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted in period (shares)			13,000

Stock-Based Compensation - Restricted Stock Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restricted Stock Units (RSUs)
Number of Shares
Granted (shares)			194,000
Weighted-Average Grant Date Fair Value per Share
Vesting period			4 years
Restricted Stock Awards
Number of Shares
Unvested, beginning balance (shares)			46,000
Granted (shares)			9,000
Vested (shares)			(38,000)
Forfeited (shares)			0
Unvested, ending balance (shares)	17,000		17,000
Weighted-Average Grant Date Fair Value per Share
Unvested, beginning balance (usd per share)			$ 8.55
Granted (usd per share)			33.30
Vested (usd per share)			9.33
Forfeited (usd per share)			0.00
Unvested, ending balance (usd per share)	$ 19.79		$ 19.79
Stock-based compensation expense	$ 84	$ 113	$ 274	$ 342
Remaining stock-based compensation expense for unvested shares, not yet recognized	$ 268		$ 268
Stock-based compensation expense, weighted average recognition period			9 months
Employee \| Restricted Stock Awards
Weighted-Average Grant Date Fair Value per Share
Vesting period			4 years
Non-Employee Director \| Restricted Stock Awards
Weighted-Average Grant Date Fair Value per Share
Vesting period			1 year

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
U.S Federal statutory rate			34.00%
Income tax expense	$ 52	$ 11	$ 93	$ 48
Pre-tax income (loss)	$ 3,734	$ (1,114)	$ 7,232	$ (6,944)
Effective tax rate	1.40%	1.00%	1.30%	0.70%

Revenue and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Product Information [Line Items]
Revenue	$ 37,903	$ 28,162	$ 105,906	$ 77,576
Core solutions
Product Information [Line Items]
Revenue	14,670	11,302	41,682	31,637
Value plus services
Product Information [Line Items]
Revenue	21,752	15,684	60,053	42,338
Other
Product Information [Line Items]
Revenue	$ 1,481	$ 1,176	$ 4,171	$ 3,601
Minimum \| Core solutions
Product Information [Line Items]
Subscriptions revenue recognition term			1 month
Maximum \| Core solutions
Product Information [Line Items]
Subscriptions revenue recognition term			1 year