Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

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

Share-based compensation expense included in costs and expenses

	Years Ended December 31,
	2016		2015		2014
	(in thousands)
Share-based compensation expense:
Cost of revenues	$	67	$	150	$	69
Sales and marketing		1,777		713		544
Technology support		601		518		251
General and administrative		1,982		1,185		562
Share-based compensation expense		4,427		2,566		1,426
Amount capitalized to internal use software		15		9		5
Total share-based compensation expense	$	4,412	$	2,557	$	1,421

Fair value of stock options granted using the following weighted average assumptions

	Years Ended December 31,
	2016			2015			2014
Expected volatility		58	%		56	%		56	%
Expected risk-free interest rate		1.2	%		1.3	%		1.4	%
Expected life (years)		4.4			4.4			4.3

Outstanding stock options

	Number of Options			Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
						(years)		(thousands)
Outstanding at December 31, 2015		2,351,941		$	8.70		4.2
Granted		933,900			16.29
Exercised		(386,001	)		7.91
Forfeited or expired		(157,309	)		12.76
Outstanding at December 31, 2016		2,742,531		$	11.15		4.3	$	10,215
Vested and expected to vest at December 31, 2016		2,637,620		$	10.97		4.2	$	10,177
Exercisable at December 31, 2016		1,719,255		$	8.49		3.2	$	9,876

Shares reserved for issuance

	Number of Shares
Stock options outstanding		2,742,531
Authorized for future grants under stock-based incentive plans		1,470,155
Reserved for conversion of preferred shares issued in relation to AutoWeb		1,680,070
Reserved for exercise of warrants		1,552,330
Reserved for conversion of promissory notes		61,200
Total		7,506,286