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Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-Term Debt    
Net carrying amount $ 0 $ 9,628
2019 Mezzanine Term Loan    
Long-Term Debt    
Principal amount of debt 0 10,000
Unamortized debt discount $ 0 $ (372)