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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Aug. 14, 2019
Jan. 01, 2019
Jul. 02, 2018
Class of Stock [Line Items]        
Property and equipment, useful life 3 years      
Operating lease ROU assets $ 9,376 $ 8,100 $ 2,300  
Operating lease liabilities $ 9,855 $ 8,100 $ 2,500  
Convertible Preferred Stock        
Class of Stock [Line Items]        
Convertible preferred stock, shares outstanding (in shares)       104,225,638
Common Stock        
Class of Stock [Line Items]        
Number of common stock issued upon conversion (in shares)       26,187,321