Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Schedule of Interest Expense Information Related to Long-term Debt (Details)

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Long-Term Debt - Schedule of Interest Expense Information Related to Long-term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Contractual interest expense $ 278 $ 441
Amortization of debt issuance costs 19 32
Accretion of final payment 49 82
Amortization of initial success fee 23 39
Total $ 369 $ 594