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Fair Value Measurement of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
May 12, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative liability extinguished upon debt conversion   $ 100    
Fair value of embedded derivative   900 $ 4,900  
Gain on change in fair value of embedded derivative   3,800    
Loss on change in fair value of embedded derivative     600  
2025 Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Value of converted amount $ 13,500 5,000    
2025 Notes | Convertible debt        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value of embedded derivative   926 4,898  
Carrying amount of debt   $ 161,898 $ 166,898 $ 180,400