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Fair Value of Financial Assets and Liabilities - Summary of Long-term Debt Carried at Amortized Cost on Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Derivative liability - exchange option and change of control | $ 9,183 | $ 28,865
Long-term royalty linked notes, less current portion | 18,403 |
Book Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Current portion of long-term debt | 3,244 | 6,374
Long-term debt, less current portion |  | 1,626
Long-term exchangeable note | 6,134 | 20,836
Derivative liability - exchange option and change of control | 9,183 | 28,865
Current portion of royalty-linked notes |  | 114
Long-term royalty linked notes, less current portion | 18,403 | 13,389
Total | 36,964 | 71,204
Approximate Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Current portion of long-term debt | 3,244 | 6,374
Long-term debt, less current portion |  | 1,512
Long-term exchangeable note | 8,685 | 31,493
Derivative liability - exchange option and change of control | 9,183 | 28,865
Current portion of royalty-linked notes |  | 114
Long-term royalty linked notes, less current portion | 18,403 | 16,379
Total | 39,515 | 84,737
Level 2 | Approximate Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Current portion of long-term debt | 3,244 | 6,374
Long-term debt, less current portion |  | 1,512
Long-term exchangeable note | 8,685 | 31,493
Total | 11,929 | 39,379
Level 3 | Approximate Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Derivative liability - exchange option and change of control | 9,183 | 28,865
Current portion of royalty-linked notes |  | 114
Long-term royalty linked notes, less current portion | 18,403 | 16,379
Total | $ 27,586 | $ 45,358

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