Equity and Employee Stock Plans (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Reserved Shares of Common Stock

The Company has reserved shares of common stock, on an as-converted basis, for future issuance as follows:

	June 30, 2019	December 31, 2018
Equity Incentive Plans
Shares underlying outstanding stock options	8,411,868	9,435,349
Shares underlying outstanding restricted stock units	3,936,774	3,264,702
Shares available for future equity grants	8,562,903	5,068,013
Total shares reserved for issuance	20,911,545	17,768,064

2017 Employee Stock Purchase Plan
Shares available for issuance on January 1, 2019 and 2018, respectively	2,890,973		2,414,688
Shares issued since January 1, 2019 and 2018, respectively	(262,110	)	(425,228	)
Total shares available for future issuance	2,628,863		1,989,460

Schedule of Stock Option Activity

The following table summarizes activity for stock options for the six months ended June 30, 2019:

	Number Of Options	Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2018	9,435,349	$	6.48	6.06	$	74,669
Options granted	150,000	27.50
Options exercised	(1,099,599)	5.25
Options forfeited	(71,588)	9.21
Options canceled	(2,294)	8.36
Outstanding at June 30, 2019	8,411,868	6.99		5.82	93,834
Options exercisable at June 30, 2019	7,146,358	6.21		5.49	84,134

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes activity for restricted stock units for the six months ended June 30, 2019:

	Restricted Stock Units		Weighted-Average Grant Date Fair Value
Unvested outstanding at December 31, 2018	3,264,702		$	19.68
Granted	1,238,075		17.54
Vested	(366,915	)	21.29
Forfeited or canceled	(199,088	)	20.32
Unvested outstanding at June 30, 2019	3,936,774		18.82

Schedule of Allocation of Share-based Compensation Costs

The following table details the Company's stock-based compensation (i) net of forfeitures, and the amount capitalized in internally developed software and (ii) includes changes to the probability of achieving outstanding performance-based equity awards, as included in the Company’s condensed consolidated statements of operations for the periods indicated below:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Cost of revenue	$	1,328	$	1,392	$	2,793	$	2,691
Technology and development	2,685		1,726		5,341		3,200
Marketing	349		157		635		276
General and administrative	1,514		1,503		3,513		2,808
Total stock-based compensation	$	5,876	$	4,778	$	12,282	$	8,975