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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Apr. 05, 2021
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]    
Summary of equity incentive program
A summary of our equity incentive program is as follows (in thousands):

 September 30,
2021
Common stock shares available for grant(1)
— 
Stock options outstanding 296 
PSUs outstanding90 
RSUs outstanding247 
RSAs outstanding— 
(1) We granted equity awards under the 2011 Equity Incentive Plan (the "2011 Plan") from July 2011 through November 2020. 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 September 30, 2021.
  
Summary of time-based stock options  
The following summarizes activities for the time-based stock options for the nine months ended September 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(206)$7.46 
Outstanding at September 30, 2021296 $7.96 3.85$171 
Vested and expected to vest at September 30, 2021272 $7.99 3.74$171 
Exercisable at September 30, 2021170 $8.20 2.95$171 
Summary of restricted stock units activities  
The following summarizes RSU activities for the nine months ended September 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(319)$7.45 
Forfeited(236)$6.67 
Outstanding at September 30, 2021247 $6.67 0.79$1,690 
Summary of restricted stock awards activities  
The following summarizes RSA activities for the nine months ended September 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 September 30, 2021— $— 0.00
Summary of PSU activities  
The following summarizes PSU activities for the nine months ended September 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
Forfeited(160)$6.20 
Outstanding at September 30, 202190 $6.20 1.33
Summary of stock-based compensation expenses  
The following table summarizes stock-based compensation expenses recognized for the three and nine months ended September 30, 2021 and 2020 (in thousands):

 Three Months Ended
September 30,		Nine Months Ended
September 30,
 2021202020212020
Stock options$123 $259 $317 $812 
RSUs, RSAs and PSUs286 1,065 1,635 2,583 
Employee stock purchase plan6 15 45 38 
Total$415 $1,339 $1,997 $3,433 
Sales and marketing$141 $205 $678 $593 
Research and development118 233 653 653 
General and administrative156 901 666 2,187 
Total$415 $1,339 $1,997 $3,433