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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Outstanding Award, Activity, Excluding Option For purposes of this table, vested RSUs represent the shares for which the service condition had been fulfilled as of March 31, 2022:
Number of
RSUs		Weighted
average grant
date fair value
Balance, December 31, 20211,087,608 $9.71 
Granted339,076 $15.93 
Vested(278,002)$11.92 
Forfeited(29,938)$52.51 
Balance, March 31, 20221,118,744 $9.90 
The following table summarizes the activity related to the Company's PSUs for the three months ended March 31, 2022.
Number of
PSUs		Weighted
average grant
date fair value
Balance, December 31, 2021— $— 
Granted116,113 $15.74 
Balance, March 31, 2022116,113 $15.74 
Share-based Payment Arrangement, Option, Activity
The following table summarizes the stock option activity for the three months ended March 31, 2022:
NumberWeighted
average
exercise price		Weighted
average grant
date fair value		Weighted average
remaining contractual
term (years)
Outstanding as of December 31, 2021720,549 $9.57 $2.21 7.37
Exercised(7,765)$9.04 $2.21 
Cancelled(90)$11.06 $9.89 
Forfeited(16,623)$11.51 $6.03 
Outstanding as of March 31, 2022696,071 $9.53 $2.12 6.84
Options exercisable as of March 31, 2022548,551 $8.56 $1.08 6.53
Vested and expected to vest as of March 31, 2022696,071 $9.53 $2.12 6.84
The following table summarizes the unvested stock option activity for the three months ended March 31, 2022:
NumberWeighted
average grant
date fair value
Unvested as of December 31, 2021202,515 $5.04 
Vested(38,372)$1.02 
Forfeited(16,623)$6.03 
Unvested as of March 31, 2022147,520 $5.98