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STOCKHOLDERS' EQUITY - Stock Options (Details) - Stock option - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2022
Number of Options  
Outstanding, beginning balance 12,520,865
Issued 2,976,652
Exercised (203,579)
Expired/Forfeited (434,264)
Outstanding, ending balance 14,859,674
Ending vested and expected to vest 14,859,674
Options exercisable 8,916,117
Weighted Average Exercise Price  
Outstanding, beginning balance $ 25.05
Issued 14.24
Exercised 8.06
Expired/Forfeited 29.90
Outstanding, ending balance 22.98
Ending vested and expected to vest 22.98
Options exercisable $ 22.22
Weighted Average Remaining Contractual Life  
Options outstanding, remaining term 7 years 5 months 4 days
Ending vested and expected to vest, remaining term 7 years 5 months 4 days
Options exercisable, remaining term 6 years 5 months 4 days
Aggregate Intrinsic Value  
Option at ending balance $ 3,728
Ending vested and expected to vest 3,728
Option exercisable $ 3,633