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SHARE-BASED COMPENSATION - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Number of Shares under Option (in thousands)    
Outstanding at beginning of period (in shares) 6,236  
Granted (in shares) 3,468  
Exercised (in shares) 0  
Canceled or forfeited (in shares) 0  
Outstanding at end of period (in shares) 9,704 6,236
Exercisable at end of period (in shares) 2,284  
Weighted-average Exercise Price per Option    
Outstanding at beginning of period (in dollars per share) $ 1.52  
Granted (in dollars per share) 0.89  
Exercised (in dollars per share) 0.00  
Canceled or forfeited (in dollars per share) 0.00  
Outstanding at end of period (in dollars per share) 1.29 $ 1.52
Exercisable (in dollars per share) $ 2.11  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Weighted-average Remaining Contractual Life (in years), Outstanding 9 years 8 years 9 months 18 days
Weighted-average Remaining Contractual Life (in years), Exercisable 8 years  
Aggregate Intrinsic Value, Outstanding $ 0 $ 358
Aggregate Intrinsic Value, Exercisable $ 0