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STOCK-BASED COMPENSATION - Summary of Stock Options (Details)
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of options  
Outstanding, beginning of period (in shares) | shares 4,938,943
Granted (in shares) | shares 894,980
Exercised (in shares) | shares (109,415)
Canceled and forfeited (in shares) | shares (190,793)
Outstanding, end of period (in shares) | shares 5,533,715
Weighted average exercise price  
Outstanding, beginning of period (in dollars per share) | $ / shares $ 5.46
Granted (in dollars per share) | $ / shares 9.37
Exercised (in dollars per share) | $ / shares 6.26
Canceled and forfeited (in dollars per shares) | $ / shares 8.22
Outstanding, end of period (in dollars per share) | $ / shares $ 5.98