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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of equity incentive program
A summary of our equity incentive program as of June 30, 2022 is as follows (in thousands):
Common stock shares available for grant1,873 
Stock options outstanding 172 
RSUs outstanding592 
RSAs outstanding119 
PSUs outstanding618 
Summary of time-based stock options
The following summarizes activities for the time-based stock options for the six months ended June 30, 2022:
Number of Shares
Underlying Stock Options
(in thousands)		Weighted Average
Exercise Price
Per Share		Weighted Average
Remaining Contractual Life
(Years)		Aggregate
Intrinsic Value
(in thousands)
Outstanding at December 31, 2021242 $8.04 4.44$— 
Granted— — 
Exercised— — 
Canceled or expired(70)7.27 
Outstanding as of June 30, 2022172 $8.35 4.21$— 
Vested and expected to vest at June 30, 2022163 $4.62 3.68$— 
Exercisable at June 30, 2022116 $8.50 4.05$— 
Summary of restricted stock units activities
The following summarizes RSU activities for the six months ended June 30, 2022:
Number of Restricted Stock Units
 (in thousands)		Weighted Average Grant Date Fair Value Per Share
Weighted Average
Remaining Contractual Life
(Years)
Aggregate
Intrinsic Value
(in thousands)
Outstanding at December 31, 2021224 $6.66 0.56$1,280 
Granted600 4.78 
Released(171)6.22 
Forfeited(61)5.91 
Outstanding at June 30, 2022592 $4.94 1.20$3,163 
Summary of restricted stock awards activities
The following summarizes RSA activities for the six months ended June 30, 2022:
Number of Restricted Stock Awards
(in thousands)
Weighted Average Grant Date Fair Value Per ShareWeighted Average Remaining Recognition Period
(Years)
Outstanding at December 31, 2021— $— 0.00
Granted233 5.13 
Released(114)4.78 
Forfeited— — 
Outstanding at June 30, 2022119 $5.47 0.90
Share-based Payment Arrangement, Outstanding Award, Activity, Excluding Option
The following summarizes PSU activities for the six months ended June 30, 2022:

Number of Market Condition-Based Restricted Stock Units
(in thousands)		Weighted Average Grant Date Fair Value Per ShareWeighted Average Remaining Recognition Period
(Years)
Outstanding at December 31, 202167 $6.20 1.49
Granted600 3.63 
Released(8)6.20 
Forfeited(41)6.20 
Outstanding at June 30, 2022618 $3.71 1.37
The assumptions used to value market condition-based restricted stock units granted during the first half of 2022 under our equity incentive program are as follows:
Six Months Ended June 30, 2022
Expected life (in years)1.2
Volatility52%
Interest rate1.0%
Dividend yield—
Summary of stock-based compensation expenses The stock-based compensation related to all of our stock-based awards and ESPP for the three and six months ended June 30, 2022 and 2021 is as follows (in thousands):
 Three Months Ended
 June 30,		Six Months Ended
 June 30,
 2022202120222021
Stock options$52 $179 $15 $194 
RSUs, RSAs and PSUs734 852 1,915 1,349 
ESPP5 20 2 39 
Total$791 $1,051 $1,932 $1,582 
Sales and marketing$(99)$313 $(2)$537 
Research and development(23)217 81 535 
General and administrative913 521 1,853 510 
Total$791 $1,051 $1,932 $1,582