STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of equity incentive program

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

	December 31, 2020
Common stock shares available for grant	3,254
Stock options outstanding	828
RSAs outstanding	130
RSUs outstanding	802
PSUs outstanding	250

Summary of time-based stock options

The following summarizes activities for the time-based stock options for the year ended December 31, 2020:

	Number of Shares Underlying Stock Options (in thousands)	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	(76)	7.62
Canceled or expired	(519)	8.46
Outstanding as of December 31, 2020	828	$	8.16	4.36	$	2,628
Vested and expected to vest at December 31, 2020	734	$	8.24	4.20	$	2,273
Exercisable at December 31, 2020	362	$	8.26	2.71	$	887

Summary of restricted stock units activities

The following summarizes RSUs activities for the year ended December 31, 2020:

	Number of Restricted Stock Unis	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	(367)	9.01
Forfeited	(291)	8.53
Outstanding at December 31, 2020	802	$	6.98	1.00	$	9,057

Summary of restricted stock awards activities

The following summarizes RSA activities for the year ended December 31, 2020:

	Number of Restricted Stock Awards (in thousands)	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 December 31, 2020	130	$	6.53	0.45

Summary of stock-based compensation expenses

The stock-based compensation related to all of our stock-based awards and ESPP for the years ended December 31, 2020 and 2019 is as follows (in thousands):

	For the Years Ended December 31,
	2020		2019
Stock options	$	1,062	$	701
RSUs, RSAs and PSUs	3,638		4,692
ESPP	56		71
Total	$	4,756	$	5,464
Sales and marketing	$	846	$	947
Research and development	870		1,304
General and administrative	3,040		3,213
Total	$	4,756	$	5,464

Summary of assumptions used to value option grants

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

Time-based stock options:
	For the Year Ended December 31,
	2020	2019
Expected life (in years)	4.2	4.4
Volatility	52%	55%
Interest rate	1.0%	2.0%
Dividend yield	—	—

Market condition based restricted stock units:
	For the Year Ended December 31,
	2020	2019 1
Expected life (in years)	1.2	N/A
Volatility	52%	N/A
Interest rate	1.0%	N/A
Dividend yield	—	N/A

(1) No market condition based restricted stock units were granted during the year ended December 31, 2019.