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Debt - Long-term debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt    
Term loan (matures October 1, 2023)   $ 10,000
Debt issuance costs, net of amortization   (222)
Accrued final payment fee   16
Long-term debt, net   $ 9,794
Annual interest rate 7.85%  
Effective interest rate on long-term debt 9.85% 9.81%