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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Outstanding Award, Activity, Excluding Option The following table summarizes the activity related to the Company's RSUs for the nine months ended September 30, 2021. For purposes of this table, vested RSUs represent the shares for which the service condition had been fulfilled as of September 30, 2021:
Number of
RSUs		Weighted
average grant
date fair value
Balance, January 1, 2021
1,857,444 $6.55 
Granted71,727 $58.82 
Vested(652,983)$6.89 
Balance, September 30, 2021
1,276,188 $9.32 
Share-based Payment Arrangement, Option, Activity
The following table summarizes the stock option activity for the nine months ended September 30, 2021:
NumberWeighted
average
exercise price		Weighted
average grant
date fair value		Weighted average
remaining contractual
term (years)
Outstanding as of January 1, 2021
922,796 $8.81 $1.78 8.08
Granted10,641 $59.03 $25.58 
Exercised(125,411)$8.43 $0.73 
Forfeited(8,982)$9.81 $5.25 
Outstanding as of September 30, 2021
799,044 $9.53 $2.23 7.43
Exercisable as of September 30, 2021
513,571 $8.51 $0.87 6.93
Unvested as of September 30, 2021
285,473 $11.35 $4.66 2.06
Vested and expected to vest as of September 30, 2021
799,044 $9.53 $2.23 7.43
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The weighted average assumptions for awards granted as of September 30, 2021 are as follows:
Estimated weighted-average fair value per stock option $59.03
Volatility45%
Risk-free rate0.85%
Dividend yieldNil
Expected term in years6.0