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STOCK BASED COMPENSATION - RSUs (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 09, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Stock-based compensation        
Stock-based compensation expense   $ 1,312 $ 325 $ 300
Unrecognized stock-based compensation balance for unvested options expected to be recognized (in years)   1 year 7 months 6 days 2 years 3 months 18 days  
Restricted Stock Units (RSUs)        
Stock-based compensation        
Awards granted (in shares) 36,464      
Vesting period 3 years      
Fair value of awards (in dollars) $ 1,300      
Fair value of awards (in dollars per share) $ 34.28      
Stock-based compensation expense   $ 19    
Unrecognized stock-based compensation balance for unvested awards   $ 1,200    
Unrecognized stock-based compensation balance for unvested options expected to be recognized (in years)   3 years 10 months 24 days    
Restricted Stock Units (RSUs) | Tranche one        
Stock-based compensation        
Vesting percentage 25.00%      
Vesting period 1 year      
Restricted Stock Units (RSUs) | Tranche two        
Stock-based compensation        
Vesting percentage 25.00%      
Vesting period 1 year      
Restricted Stock Units (RSUs) | Tranche three        
Stock-based compensation        
Vesting percentage 25.00%      
Vesting period 1 year      
Restricted Stock Units (RSUs) | Tranche four        
Stock-based compensation        
Vesting percentage 25.00%      
Vesting period 1 year