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STOCK AWARD PLAN AND STOCK-BASED COMPENSATION - Stock Option Activity for Employees and Non-Employees (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Shares Issuable Pursuant to Stock Options      
Granted (in shares) 0 0  
Employees and Non-Employees Stock Option      
Shares Issuable Pursuant to Stock Options      
Outstanding at the beginning of period (in shares) 9,040,328    
Exercised (in shares) (135,013)    
Forfeited (in shares) (105,356)    
Outstanding at the end of the period (in shares) 8,799,959   9,040,328
Exercisable at the end of the period (in shares) 5,614,559    
Available for future grant (in shares) 245,354    
Weighted-Average Exercise Price      
Outstanding at the beginning of period (in dollars per share) $ 6.98    
Exercised (in dollars per share) 5.91    
Forfeited (in dollars per share) 9.63    
Outstanding at the end of the period (in dollars per share) 6.96   $ 6.98
Exercisable at the end of the period (in dollars per share) $ 6.69    
Weighted-Average Remaining Contractual Term Outstanding (Years) 7 years 1 month 6 days   7 years 3 months 18 days
Weighted-Average Remaining Contractual Term Exercisable (Years) 6 years 4 months 24 days    
Total Intrinsic Value Outstanding at the begining of period $ 7,420    
Total Intrinsic Value Outstanding at the end of period 1,625   $ 7,420
Total Intrinsic Value Exercisable $ 1,586