Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Schedule of stock option activity

A summary of the Company’s stock option activity under all Plans is as follows:

	Number of Options Outstanding		Weighted– Average Exercise Price		Weighted– Average Remaining Contractual Life (In Years)	Weighted- Average Fair Value per Share
Outstanding at December 31, 2014	665,210		$	4.39	8.78	$	2.37
Options granted	420,616		6.93			6.93
Options exercised	(106,338	)	2.17			2.24
Options forfeited	(201,100	)	5.62			4.99
Outstanding at December 31, 2015	778,388		$	5.75	8.39	$	5.75
Options granted	137,586		7.74			3.23
Options exercised	(43,101	)	4.93			2.54
Options forfeited	(75,251	)	7.01			3.69
Options expired	(37,903	)	4.94			4.90
Outstanding at December 31, 2016	759,719		$	6.06	7.73	$	2.84
Options granted	44,514		22.23			7.47
Options exercised	(221,156	)	5.50			5.76
Options forfeited	(32,050	)	10.09			15.03
Options expired	(1,120	)	4.97			2.65
Outstanding at December 31, 2017	549,907		$	7.36	7.30	$	3.77
Options vested and expected to vest at December 31, 2015	769,142		$	5.72	8.37
Options vested and exercisable at December 31, 2015	244,631		$	3.78	6.91
Options vested and expected to vest at December 31, 2016	747,736		$	6.04	7.70
Options vested and exercisable at December 31, 2016	482,731		$	5.41	7.25
Options vested and expected to vest at December 31, 2017	545,122		$	7.31	7.28
Options vested and exercisable at December 31, 2017	470,368		$	6.46	7.10

Schedule of restricted stock activity

A summary of the Company’s restricted stock activity under the 2010 and 2014 Plan is as follows:

	Number of Restricted Shares Outstanding	Weighted-Average Remaining Vesting Term (Years)	Weighted-Average Grant Date Fair Value	Total Fair Value of Shares Vested During the Year
Unvested balances at December 31, 2015	513,943	2.4	$8.15
Awards granted	778,097		$7.13
Awards vested	(385,895)		$7.72	$3,253,660
Awards forfeited	(66,668)		$6.98
Unvested balances at December 31, 2016	839,477	1.9	$7.55
Awards granted	855,665		$17.10
Awards vested	(588,214)		$10.78	$12,575,851
Awards forfeited	(59,448)		$10.89
Unvested balances at December 31, 2017	1,047,480	2.0	$13.35

Schedule of allocated share-based compensation expense

The Company recognized share-based compensation expense from all awards in the following expense categories (in thousands):

	Year Ended December 31,
	2017		2016		2015
Cost of revenue	$	436	$	44	$	42
Research and development	796		204		203
Sales and marketing	232		105		65
General and administrative	8,513		3,980		2,431
Total	$	9,977	$	4,333	$	2,741