Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Schedule of Number of Shares of Common Stock Reserved for Future Issuance

The Company has reserved for future issuance the following number of shares of common stock:

	June 30, 2018		December 31, 2017
Unvested restricted stock		956,247		1,164,040
Common stock options		385,974		666,717
Shares available for issuance under the 2013 Stock Option and    Incentive Plan		4,618,038		3,273,334
Shares available for issuance under the 2013 Employee Stock    Purchase Plan		788,503		788,503
		6,748,762		5,892,594

Summary of Roll Forward of Restricted Stock Activity Pursuant to the 2010 and 2013 Stock Plan

The following table shows a roll forward of restricted stock activity pursuant to the 2010 Stock Plan and the 2013 Stock Plan:

	Number of Shares
Unvested at December 31, 2017		1,164,040
Granted		296,005
Vested		(332,586	)
Forfeited		(171,212	)
Unvested at June 30, 2018		956,247

Summary of Stock Option Activity Under the 2010 Stock Plan and the 2013 Stock Plan

A summary of stock option activity under the 2010 Stock Plan and the 2013 Stock Plan for the six months ended June 30, 2018 is as follows:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (In Years)		Aggregate Intrinsic Value
								(in thousands)
Outstanding as of December 31, 2017		666,717		$	19.53		5.6	$	32,450
Granted		—			—
Exercised		(272,917	)		19.48
Forfeited		(7,826	)		34.10
Outstanding as of June 30, 2018		385,974		$	19.27		5.3	$	45,325
Exercisable as of June 30, 2018		360,495		$	18.40		5.1	$	42,646

Recorded Stock-Based Compensation Expense in the Consolidated Statements of Operations and Comprehensive Loss

The Company recorded stock-based compensation expense in the statements of operations and comprehensive loss as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cost of revenue	$	309	$	563	$	547	$	1,658
Selling and marketing		957		1,297		1,869		2,517
General and administrative		1,813		3,159		3,094		5,937
Research and development		1,006		1,707		1,783		3,013
Total	$	4,085	$	6,726	$	7,293	$	13,125