Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE - Summary of RSUs (Details)

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EQUITY AND EARNINGS PER SHARE - Summary of RSUs (Details) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Number of RSUs    
Beginning balance (in shares) 259,238  
Granted (in shares) 149,660  
Released (in shares) (162,706)  
Forfeited (in shares) (53,002)  
Ending balance (in shares) 193,190 259,238
Weighted Average Grant Date Fair Value (per unit)    
Beginning balance (in dollars per share) $ 3.72  
Granted (in dollars per share) 1.47  
Released (in dollars per share) 3.45  
Forfeited (in dollars per share) 3.74  
Ending balance (in dollars per share) $ 2.20 $ 3.72
Vesting period   1 year
Non-employee    
Weighted Average Grant Date Fair Value (per unit)    
Vesting period 1 year