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Debt - Carrying Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt    
Net carrying value of debt, Current Portion $ 1,271 $ 670
Net carrying value of debt, Long-term debt 6,621 7,149
2019 Credit Facility    
Debt    
Debt, Current Portion 1,400 800
Less: Debt issuance costs, Current Portion (129) (130)
Net carrying value of debt, Current Portion 1,271 670
Debt, including end of term fee, Long-term debt 7,020 7,620
Less: Unamortized debt discounts, Long-term debt (399) (471)
Net carrying value of debt, Long-term debt 6,621 7,149
Total principal amount 8,420 8,420
Less: Discount attributable to warrants, end of term fee and debt issuance costs, Total (528) (601)
Net carrying value of debt, Total $ 7,892 $ 7,819