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STOCK-BASED COMPENSATION PLANS - RSA and RSU Activity (Details) - $ / shares
1 Months Ended 12 Months Ended
Apr. 30, 2019
Dec. 31, 2019
Change in unvested restricted stock awards    
Vested (in shares) (292,500)  
RSAs    
Change in unvested restricted stock awards    
Unvested balance at the beginning of the period (in shares)   1,508,011
Granted (in shares)   0
Vested (in shares)   (967,291)
Forfeited (in shares)   (52,744)
Unvested balance at the end of the period (in shares)   487,976
Weighted average grant-date fair value    
Unvested balance at the beginning of the period (in dollars per share)   $ 6.90
Granted (in dollars per share)   0.00
Vested (in dollars per share)   6.90
Forfeited (in dollars per share)   7.04
Unvested balance at end of the period (in dollars per share)   $ 6.87
RSUs    
Change in unvested restricted stock awards    
Unvested balance at the beginning of the period (in shares)   636,300
Granted (in shares)   2,828,832
Vested (in shares)   (537,416)
Forfeited (in shares)   (137,656)
Unvested balance at the end of the period (in shares)   2,790,060
Weighted average grant-date fair value    
Unvested balance at the beginning of the period (in dollars per share)   $ 6.52
Granted (in dollars per share)   4.98
Vested (in dollars per share)   6.04
Forfeited (in dollars per share)   5.35
Unvested balance at end of the period (in dollars per share)   $ 5.11