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STOCK-BASED COMPENSATION - Summary of RSU Activity (Details) - Restricted Stock Units - $ / shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of RSUs, Unvested beginning of period 1,695 3,578
Number of RSUs, Granted 0 0
Number of RSUs, Forfeited 0 (189)
Number of RSUs, Vested 0 0
Number of RSUs, Unvested end of period 1,695 3,389
Weighted Average Grant Date Fair Value, Unvested RSUs beginning of period $ 70.00 $ 70.00
Weighted Average Grant Date Fair Value, Granted 0.00 0.00
Weighted Average Grant Date Fair Value, Forfeited 0.00 70.00
Weighted Average Grant Date Fair Value, Vested 0.00 0.00
Weighted Average Grant Date Fair Value, Unvested RSUs end of period $ 70.00 $ 70.00