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Convertible Notes and Term Loan - 2022 Convertible Notes Future Payments (Details) - 8.2% Convertible Notes due 2022 - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument    
Remainder of 2021 $ 2,050  
2022 111,050  
Total minimum payments 113,100  
Less amount representing interest (4,100)  
2026 Convertible Notes, principal amount 109,000  
Less debt discount and debt issuance costs on 2026 Convertible Notes (1,030)  
Net carrying amount of 2026 Convertible Notes 107,970  
Senior unsubordinated notes    
Debt Instrument    
Less debt discount and debt issuance costs on 2026 Convertible Notes $ (772) $ (1,865)