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)
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Number of RSUs  
Beginning balance (in shares) 520,618
Granted (in shares) 110,206
Released (in shares) (211,445)
Forfeited (in shares) (160,141)
Ending balance (in shares) 259,238
Weighted Average Grant Date Fair Value (per unit)  
Beginning balance (in dollars per share) | $ / shares $ 4.66
Granted (in dollars per share) | $ / shares 2.45
Released (in dollars per share) | $ / shares 4.69
Forfeited (in dollars per share) | $ / shares 4.62
Ending balance (in dollars per share) | $ / shares $ 3.72
Vesting period 1 year
Non-employee  
Number of RSUs  
Granted (in shares) 110,206
Weighted Average Grant Date Fair Value (per unit)  
Vesting period 1 year