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

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	Jun. 30, 2020	Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative liability - exchange option and change of control	$ 25,371
Long-term royalty linked notes, less current portion	13,046
Book Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Current portion of long-term debt	5,930	$ 5,800
Long-term debt, less current portion	5,366	7,625
Long-term exchangeable note	15,565
Derivative liability - exchange option and change of control	25,371
Current portion of royalty linked notes	53
Long-term royalty linked notes, less current portion	11,826
Total	64,111	13,425
Approximate Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Current portion of long-term debt	5,930	5,800
Long-term debt, less current portion	5,079	7,213
Long-term exchangeable note	28,578
Derivative liability - exchange option and change of control	25,371
Current portion of royalty linked notes	53
Long-term royalty linked notes, less current portion	12,993
Total	78,004	13,013
Level 2 \| Approximate Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Current portion of long-term debt	5,930	5,800
Long-term debt, less current portion	5,079	7,213
Long-term exchangeable note	28,578
Total	39,587	$ 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	25,371
Current portion of royalty linked notes	53
Long-term royalty linked notes, less current portion	12,993
Total	$ 38,417

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)