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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 8 Months Ended 12 Months Ended
Aug. 31, 2019
Aug. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2017
Series B          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative liabilities       $ 4,000  
Issuance of convertible preferred stock, net (in shares) 11,294,902   11,751,154 11,166,572  
Change in fair value   $ 6,393      
Series A          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Derivative liabilities         $ 500
Issuance of convertible preferred stock, net (in shares)       10,000,000  
Number of shares into which the warrant may be converted         32,442