Long term Debt - Schedule of long term debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt
Long-term Debt	$ 30,524	$ 30,243
OrbiMed Term Loans (related party)
Debt
Long Term Debt	30,000	30,000
End of term charge	3,000	3,000
Unamortized issuance costs	(2,476)	(2,757)
Long-term Debt	$ 30,524	$ 30,243

Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Amount, after accumulated amortization, of debt premium.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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