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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 48 Months Ended
Jan. 01, 2020
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized for issuance (in shares)               4,182,404
Expiration period       10 years        
Percent of common stock authorized under plan       4.00%        
Additional shares authorized for plan (in shares) 1,394,475           3,530,773  
Outstanding, exercisable equity awards (in shares)         4,095,970      
Remaining equity awards available for future issuances (in shares)         1,541,083      
Unrecognized employee stock-based compensation costs         $ 3.9      
Remaining weighted-average period for RSUs         2 years 4 months 9 days      
Options to Purchase Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding (in shares)         5,159,000   3,497,000  
Expiration period           10 years    
Vesting period (up to)           48 months    
Weighted average fair value per option (in usd per share)         $ 0.65 $ 2.33    
Options to Purchase Common Stock | Initial Vesting Period                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percent           25.00%    
Options to Purchase Common Stock | Subsequent Vesting Period                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percent           75.00%    
Vesting period (up to)           36 months    
Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Purchase price of common stock, percentage of fair market value       85.00%        
Stock purchase offering period       6 months        
Number of shares available for issuance under ESPP (in shares)         947,793      
Issuance of common stock for cash under employee stock purchase plan (in shares)   23,171 34,167   145,061      
2008 Equity Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares outstanding (in shares)         1,063,002      
2016 Equity Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Basis for equity incentive plan (in shares)               1,681,294