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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Summary of equity incentive program
A summary of our equity incentive program is as follows (in thousands):

 June 30,
2021
Common stock shares available for grant(1)
— 
Stock options outstanding 375 
PSUs outstanding190 
RSUs outstanding364 
RSAs outstanding— 
(1) We granted equity awards under the 2011 Equity Incentive Plan (the "2011 Plan") from July 2011 through April 2021. The 2011 Plan expired on April 5, 2021, and the remaining 3,708,238 authorized shares were cancelled on the 2011 Plan expiration date. We do not have an active equity incentive plan as of June 30, 2021.
Summary of time-based stock options
The following summarizes activities for the time-based stock options for the six months ended June 30, 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 
Exercised(326)$8.79 
Canceled or expired(127)$7.46 
Outstanding at June 30, 2021375 $7.85 4.80$431 
Vested and expected to vest at June 30, 2021375 $7.85 4.80$431 
Exercisable at June 30, 2021158 $8.21 4.24$161 
Summary of restricted stock units activities
The following summarizes RSU activities for the six months ended June 30, 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 
Released(310)$7.45 
Forfeited(128)$6.63 
Outstanding at June 30, 2021364 $6.71 1.01$3,197 
Summary of restricted stock awards activities
The following summarizes RSA activities for the six months ended June 30, 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(130)$6.53 
Forfeited— $— 
Outstanding at June 30, 2021— $— 0.00
Summary of PSU activities
The following summarizes PSU activities for the six months ended June 30, 2021 (in thousands except for weighted average grant date fair value and weighted average remaining recognition period):

Number of Market Condition-Based Restricted Stock UnitsWeighted Average Grant Date Fair ValueWeighted Average Remaining Recognition Period
(Years)
Outstanding at December 31, 2020250 $6.20 2.08
Granted— $— 
Released— $— 
Forfeited(60)$6.20 
Outstanding at June 30, 2021190 $6.20 1.58
Summary of stock-based compensation expenses
The following table summarizes stock-based compensation expenses recognized for the three and six months ended June 30, 2021 and 2020 (in thousands):

 Three Months Ended
June 30,		Six Months Ended
June 30,
 2021202020212020
Stock options$179 $298 $194 $553 
RSUs, RSAs and PSUs852 1,056 1,349 1,518 
Employee stock purchase plan20 11 39 23 
Total$1,051 $1,365 $1,582 $2,094 
Sales and marketing$313 $343 $537 $388 
Research and development217 251 535 420 
General and administrative521 771 510 1,286 
Total$1,051 $1,365 $1,582 $2,094