Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Assets and Liabilities - Summary of Long-term Debt Carried at Amortized Cost on Condensed Consolidated Balance Sheet (Details)

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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
Mar. 31, 2021
Dec. 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative liability - exchange option and change of control $ 28,868 $ 28,865
Long-term royalty linked notes, less current portion 28,988  
Book Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Current portion of long-term debt 6,431 6,374
Long-term debt, less current portion   1,626
Long-term exchangeable note 6,094 20,836
Derivative liability - exchange option and change of control 28,868 28,865
Current portion of royalty linked notes 190 114
Long-term royalty linked notes, less current portion 28,798 13,389
Total 70,381 71,204
Approximate Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Current portion of long-term debt 6,431 6,374
Long-term debt, less current portion   1,512
Long-term exchangeable note 9,105 31,493
Derivative liability - exchange option and change of control 28,868 28,865
Current portion of royalty linked notes 190 114
Long-term royalty linked notes, less current portion 28,798 16,379
Total 73,392 84,737
Level 2 | Approximate Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Current portion of long-term debt 6,431 6,374
Long-term debt, less current portion   1,512
Long-term exchangeable note 9,105 31,493
Total 15,536 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 28,868 28,865
Current portion of royalty linked notes 190 114
Long-term royalty linked notes, less current portion 28,798 16,379
Total $ 57,856 $ 45,358