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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 | 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 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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