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STOCK BASED COMPENSATION - Plans (Details) - shares
1 Months Ended
May 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Stock-based compensation      
Options outstanding (in shares)   4,079,888 1,202,979
2019 Plan      
Stock-based compensation      
Shares reserved (in shares) 1,749,192    
New shares reserved (in shares) 1,618,841    
Reserved shares available from 2016 Plan (in shares) 2,911,159    
Increase in number of shares reserved and available for issuance (as a percent) 5.00%    
Expiration period 10 years    
Vesting period 4 years    
2019 Plan | Maximum      
Stock-based compensation      
Shares reserved (in shares) 4,530,000    
2019 Plan | Options      
Stock-based compensation      
Maximum number of shares authorized for issuance 13,000,000