STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Summary of equity incentive program

A summary of our equity incentive program is as follows (in thousands):

	September 30, 2020
Common stock shares available for grant	2,814
Stock options outstanding	1,367
RSAs outstanding	130
RSUs outstanding	1,067

Summary of time-based stock options

The following summarizes activities for the time-based stock options for the nine months ended September 30, 2020 (in thousands except for weighted average exercise price 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, 2019	967	$	8.55	5.63	$	16
Granted	456	$	7.58
Exercised	(2)	$	8.13
Canceled or expired	(54)	$	9.71
Outstanding at September 30, 2020	1,367	$	8.18	5.59	$	—
Vested and expected to vest at September 30, 2020	1,192	$	8.23	5.53	$	—
Exercisable at September 30, 2020	393	$	8.82	4.61	$	—

Summary of restricted stock units activities

The following summarizes RSU activities for the nine months ended September 30, 2020 (in thousands except for weighted average grant date fair value 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, 2019	945	$	8.81	1.25	$	7,020
Granted	515	$	5.95
Released	(337)	$	8.99
Forfeited	(56)	$	8.31
Outstanding at September 30, 2020	1,067	$	7.39	1.20	$	7,524

Summary of restricted stock awards activities

The following summarizes RSA activities for the nine months ended September 30, 2020 (in thousands except for weighted average grant date fair value and weighted average remaining recognition period):

	Number of Restricted Stock Awards	Weighted Average Grant Date Fair Value		Weighted Average Remaining Recognition Period (Years)
Outstanding at December 31, 2019	91	$	7.45	0.45
Granted	142	$	6.43
Released	(71)	$	7.18
Forfeited	(32)	$	7.27
Outstanding at September 30, 2020	130	$	6.53	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, 2020 and 2019 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Stock options	$	259	$	200	$	812	$	516
RSUs and RSAs	1,065		971		2,583		3,798
Employee stock purchase plan	15		16		38		57
Total	$	1,339	$	1,187	$	3,433	$	4,371
Sales and marketing	$	205	$	207	$	593	$	700
Research and development	233		234		653		1,054
General and administrative	901		746		2,187		2,617
Total	$	1,339	$	1,187	$	3,433	$	4,371

Summary of assumptions used to value options granted

The assumptions used to value options granted under our equity incentive program are as follows:

	Three Months Ended September 30,			Nine Months Ended September 30,
	2020 (1)	2019		2020		2019
Expected life (in years)	N/A	4.3		4.2		4.3
Volatility	N/A	53	%	52	%	53	%
Interest rate	N/A	1.8	%	1.0	%	1.7	%
Dividend yield	N/A	—	%	—	%	—	%