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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of equity incentive program
A summary of our equity incentive program is as follows (in thousands):
 March 31,
2021
Common stock shares available for grant3,271 
Stock options outstanding 521 
PSUs outstanding250 
RSUs outstanding565 
RSAs outstanding130 
Summary of time-based stock options
The following summarizes activities for the time-based stock options for the three months ended March 31, 2021 (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, 2020828 $8.16 4.36$2,628 
Granted— $— 
Exercised(307)$8.87 
Canceled or expired— $— 
Outstanding at March 31, 2021521 $7.74 5.21$1,020 
Vested and expected to vest at March 31, 2021447 $7.76 5.18$866 
Exercisable at March 31, 2021129 $8.32 4.69$212 
Summary of restricted stock units activities
The following summarizes RSU activities for the three months ended March 31, 2021 (in thousands except for weighted average grant date fair value and weighted average remaining contractual life data):
Number of Restricted Stock UnitsWeighted Average Grant Date Fair ValueWeighted Average
Remaining Contractual Life
(Years)		Aggregate
Intrinsic Value
Outstanding at December 31, 2020802 $6.98 1.00$9,057 
Granted— $— 
Released(227)$7.49 
Forfeited(10)$6.74 
Outstanding at March 31, 2021565 $6.78 1.08$5,415 
Summary of restricted stock awards activities
The following summarizes RSA activities for the three months ended March 31, 2021 (in thousands except for weighted average grant date fair value and weighted average remaining recognition period):
Number of Restricted Stock AwardsWeighted Average Grant Date Fair ValueWeighted Average Remaining Recognition Period
(Years)
Outstanding at December 31, 2020130 $6.53 0.45
Granted— $— 
Released— $— 
Forfeited— $— 
Outstanding at March 31, 2021130 $6.53 0.20
Summary of stock-based compensation expenses
The following table summarizes stock-based compensation expenses recognized for the three months ended March 31, 2021 and 2020 (in thousands):
 Three Months Ended
March 31,
 20212020
Stock options$15 $255 
RSUs and RSAs497 462 
Employee stock purchase plan19 12 
Total$531 $729 
Sales and marketing$224 $45 
Research and development318 168 
General and administrative(11)516 
Total$531 $729 
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,
 
2021 (1)
2020
Expected life (in years)N/A4.2
VolatilityN/A52 %
Interest rateN/A1.0 %
Dividend yieldN/A— %