STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of equity incentive program

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

	March 31, 2020
Common stock shares available for grant	3,080
Stock options outstanding	1,370
RSAs outstanding	71
RSUs outstanding	1,192

Summary of time-based stock options

The following summarizes activities for the time-based stock options for the three months ended March 31, 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	—		$	—
Canceled or expired	(53	)	$	9.74
Outstanding as of March 31, 2020	1,370		$	8.18	6.10	$	—
Vested and expected to vest at March 31, 2020	1,130		$	8.24	6.02	$	—
Exercisable at March 31, 2020	192		$	9.80	4.11	$	—

Summary of restricted stock units activities

The following summarizes RSU activities for the three months ended March 31, 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	458		$	5.92
Released	(190	)	$	9.67
Forfeited	(21	)	$	7.93
Outstanding at March 31, 2020	1,192		$	7.57	1.49	$	6,389

Summary of restricted stock awards activities

The following summarizes RSA activities for the three months ended March 31, 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	12		$	5.43
Released	—		$	—
Forfeited	(32	)	$	7.27
Outstanding at March 31, 2020	71		$	7.18	0.21

Summary of stock-based compensation expenses

The following table summarizes stock-based compensation expenses recognized for the three months ended March 31, 2020 and 2019 (in thousands):

	Three Months Ended March 31,
	2020		2019
Stock options	$	255	$	194
RSUs and RSAs	462		1,888
Employee stock purchase plan	12		21
Total	$	729	$	2,103
Sales and marketing	$	45	$	320
Research and development	168		630
General and administrative	516		1,153
Total	$	729	$	2,103

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 March 31,
	2020		2019
Expected life (in years)	4.2		4.5
Volatility	52	%	53	%
Interest rate	1.0	%	2.5	%
Dividend yield	N/A		N/A