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STOCKHOLDERS' EQUITY - Stock option activity (Details)
9 Months Ended
Sep. 30, 2021
shares
Stock options  
Equity Incentive Plans Stock Option Activity [Line Items]  
Equity awards outstanding, beginning of year 2,526
Number of shares, Exercised/Vested (53)
Number of shares, Expired/Forfeited (6)
Equity awards outstanding, end of period 2,467
Unvested restricted stock  
Equity Incentive Plans Stock Option Activity [Line Items]  
Equity awards outstanding, beginning of year 10,785
Number of shares, Granted. 2,464
Number of shares, Exercised/Vested (1,106)
Number of shares, Expired/Forfeited (150)
Equity awards outstanding, end of period 11,993