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EQUITY INCENTIVE PLANS (Tables)
 6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of Restricted Stock Units and Performance-based Restricted Stock Units Activity
The following table summarizes RSU and PRSU activity during the six months ended June 30, 2022:
Number of
RSUs and PRSUs		Weighted Average Grant Date Fair Value
Outstanding at December 31, 20211,174,087 $2.53 
RSUs and PRSUs granted1,466,954 0.83 
RSUs and PRSUs vested(754,296)1.34 
RSUs and PRSUs canceled(52,950)2.78 
Outstanding at June 30, 20221,833,795 $1.65 
Summary of Stock Option Activity
The following table summarizes stock option activity during the six months ended June 30, 2022:
Number of
Shares
Weighted
Average
Exercise Price
Weighted
Average
Remaining
Contractual Life
in Years
Total Aggregate
Intrinsic Value (in thousands)
Outstanding at December 31, 20218,296,091 $3.21 6.31$— 
Options granted
2,005,700 0.80 
Options exercised
— — 
Options canceled
(1,109,875)3.11 
Outstanding at June 30, 20229,191,916 $2.70 7.03$— 
Vested and expected to vest at June 30, 20229,191,916 $2.70 7.03$— 
Exercisable at June 30, 20225,177,319 $3.54 5.79$— 
Schedule of Stock-based Compensation Expense
Stock-based compensation expense recognized for restricted shares, RSUs, PRSUs, stock options, and the ESPP has been reported in the statements of operations as follows (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Research and development$468 $399 $923 $790 
General and administrative384 472 1,267 960 
Total$852 $871 $2,190 $1,750