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STOCKHOLDERS' EQUITY - Summary of restricted shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Equity Incentive Plans Restricted Stock Activity [Line Items]      
Total compensation expense associated with restricted stock grants $ 19,185 $ 61,274 $ 80,289
Unvested restricted stock      
Equity Incentive Plans Restricted Stock Activity [Line Items]      
Number of shares, Outstanding at Beginning Balance 12,032,040 10,785,034 7,091,789
Number of shares, Granted 5,179,201 2,738,974 4,909,829
Number of shares, Vested (6,291,999) (1,302,737) (1,087,918)
Number of shares, Forfeited (2,186,956) (189,231) (128,666)
Number of shares, Outstanding at Ending Balance 8,732,286 12,032,040 10,785,034
Weighted-average grant date fair value, Outstanding at Beginning Balance $ 18.67 $ 13.38 $ 7.78
Weighted-average grant date fair value, Granted 12.75 39.49 20.34
Weighted-average grant date fair value, Vested 11.28 18.14 8.40
Weighted-average grant date fair value, Forfeited 22.44 21.80 8.70
Weighted-average grant date fair value, Outstanding at Ending Balance $ 16.12 $ 18.67 $ 13.38
Total compensation expense associated with restricted stock grants $ 15,800 $ 58,400 $ 74,200
Unrecognized compensation cost $ 29,200    
Expected weighted-average period in years of compensation cost to be recognized 2 years 7 months 6 days    
Milestone Based Restricted Stock      
Equity Incentive Plans Restricted Stock Activity [Line Items]      
Number of shares, Outstanding at Ending Balance 1,961,258