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Debt - Carrying Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jul. 31, 2019	Dec. 31, 2018
Debt
Net carrying value of debt, Current Portion	$ 72		$ 5,977
Net carrying value of debt, Long-term debt	7,676		6,509
2017 Credit Facility
Debt
Debt, Current Portion	200		6,000
Less: Debt issuance costs, Current Portion	(128)		(33)
Net carrying value of debt, Current Portion	72		5,967
Debt, including end of term fee, Long-term debt	8,220		6,840
Less: Unamortized debt discounts, Long-term debt	(544)		(341)
Net carrying value of debt, Long-term debt	7,676		6,499
Total principal amount	8,420	$ 8,000	12,840
Less: Discount attributable to warrants, end of term fee and debt issuance costs, Total	(672)		(374)
Net carrying value of debt, Total	$ 7,748		$ 12,466

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Long-term debt before unamortized (discount) premium, current.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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