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LONG-TERM DEBT - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
LONG-TERM DEBT.    
Long-term debt $ 30,000  
End of term fee 975  
Long-term debt, gross 30,975  
Less: unamortized debt issuance costs (1,774)  
Long-term Debt 29,201  
Long-term debt non-current $ 29,201 $ 28,970