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
Sep. 30, 2020
Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative liability - exchange option and change of control $ 26,097  
Long-term royalty linked notes, less current portion 15,782  
Book Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Current portion of long-term debt 6,084 $ 5,800
Long-term debt, less current portion 3,757 7,625
Long-term exchangeable note 17,896  
Derivative liability - exchange option and change of control 26,097  
Current portion of royalty linked notes 74  
Long-term royalty linked notes, less current portion 12,492  
Total 66,400 13,425
Approximate Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Current portion of long-term debt 6,084 5,800
Long-term debt, less current portion 3,541 7,213
Long-term exchangeable note 30,027  
Derivative liability - exchange option and change of control 26,097  
Current portion of royalty linked notes 74  
Long-term royalty linked notes, less current portion 15,708  
Total 81,531 13,013
Level 2 | Approximate Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Current portion of long-term debt 6,084 5,800
Long-term debt, less current portion 3,541 7,213
Long-term exchangeable note 30,027  
Total 39,652 $ 13,013
Level 3 | Approximate Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative liability - exchange option and change of control 26,097  
Current portion of royalty linked notes 74  
Long-term royalty linked notes, less current portion 15,708  
Total $ 41,879