STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement [Abstract]

Summary of equity incentive program

A summary of the Company's equity incentive program is as follows (in thousands):

	September 30, 2019
Common stock shares available for grant	3,172
Standard and market condition-based stock options outstanding	2,011
RSAs outstanding	91
RSUs outstanding	949

Summary of time-based stock options

The following summarizes activities for the time-based stock options for the nine months ended September 30, 2019 (in thousands except for weighted average exercise per share and weighted average remaining contractual life data):

	Number of Shares Underlying Stock Options		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2018	1,862		$	9.44	2.85	$	751
Granted	783		$	8.25
Exercised	(173	)	$	7.16
Canceled or expired	(733	)	$	9.78
Outstanding as of September 30, 2019	1,739		$	8.98	3.35	$	128
Vested and expected to vest at September, 2019	1,739		$	8.98	3.35	$	128
Exercisable at September 30, 2019	927		$	9.57	0.52	$	10

Summary of restricted stock units activities

The following summarizes RSU activities for the nine months ended September 30, 2019 (in thousands except for weighted average exercise per share and weighted average remaining contractual life data):

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2018	1,091		$	10.97	0.67	$	9,773
Granted	864		$	8.57
Released	(709	)	$	11.32
Forfeited	(297	)	$	9.84
Outstanding at September 30, 2019	949		$	8.88	1.47	$	7,259

Summary of restricted stock awards activities

The following summarizes RSA activities for the nine months ended September 30, 2019 (in thousands except for weighted average exercise per share and weighted average remaining contractual life data):

	Number of Restricted Stock Awards		Weighted Average Grant Date Fair Value		Weighted Average Remaining Recognition Period (Years)
Outstanding at December 31, 2018	55		$	13.02	0.46
Granted	114		$	7.06
Released	(62	)	$	12.63
Forfeited	(16	)	$	7.27
Outstanding at September 30, 2019	91		$	7.45	0.70

Summary of stock-based compensation expenses

The following table summarizes stock-based compensation expenses recognized for the three and nine months ended September 30, 2019 and 2018 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Stock options	$	200	$	286	$	516	$	960
RSUs and RSAs	971		2,206		3,798		5,234
Employee stock purchase plan	16		22		57		72
Total	$	1,187	$	2,514	$	4,371	$	6,266
Sales and marketing	$	207	$	377	$	700	$	675
Research and development	234		561		1,054		1,382
General and administrative	746		1,576		2,617		4,209
Total	$	1,187	$	2,514	$	4,371	$	6,266