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DEBT - Future Payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt    
2019 (remainder of year) $ 0  
2020 0  
2021 0  
Total principal payments 0  
Less unamortized debt issuance costs 0 $ (20)
Total debt 0  
Capital leases    
2019 (remainder of the year) 5  
2020 24  
2021 13  
Total principal payments 42  
Total debt    
2019 (remainder of the year) 5  
2020 24  
2021 13  
Total principal payments 42  
Less unamortized debt issuance costs 0 $ (20)
Total debt $ 42