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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Derivative liability, current $ 1,633   $ 1,633   $ 0
Derivative liability, noncurrent 10,305   10,305   0
Fair value of warrants 399   399   $ 0
Gain on fair value of warrant liabilities (373) $ 0 (1,447) $ 0  
2026 Notes | Convertible notes          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair value of derivative liability 11,900   11,900    
Derivative liability, current 1,600   1,600    
Derivative liability, noncurrent 10,300   10,300    
Gain on fair value of derivative liability $ 49,900   $ 49,900    
Private Placement Warrants          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair value price of warrants (in dollars per share) $ 0.46   $ 0.46    
Fair value of warrants $ 300   $ 300    
Gain on fair value of warrant liabilities $ 300   $ 100    
PIPE Warrants          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair value price of warrants (in dollars per share) $ 0.46   $ 0.46    
Fair value of warrants $ 100   $ 100    
Gain on fair value of warrant liabilities $ 100   $ 1,300