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BUSINESS COMBINATIONS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 03, 2020
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Business Acquisition [Line Items]          
Cash payments to acquire business, net of cash acquired     $ 6,658 $ 0  
Equity interests issued or issuable to previous investors $ 8,400        
Acquired developed technology          
Business Acquisition [Line Items]          
Developed technology useful life (in years)     9 years 2 months 12 days   9 years 10 months 24 days
Paradigm & Viomics          
Business Acquisition [Line Items]          
Business combination, consideration transferred   $ 40,400      
Cash payments to acquire business, net of cash acquired $ 8,200        
Issuance of common stock to acquire business   $ 28,800 $ 32,200    
Amount of shares held for future issuance     $ 3,400    
Equity interests issued or issuable to previous investors, vesting period 4 years        
Paradigm & Viomics | Acquired developed technology          
Business Acquisition [Line Items]          
Developed technology useful life (in years) 15 years