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Development Derivative Liability - Schedule of Development Derivative Liability (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |  |  |  |  |  |
Balance at fair market value | $ 220,475 | $ 223,245 | $ 134,839 | $ 109,840 | $ 60,736 |  | $ 134,839 |
Amounts received under the SFJ agreement and SFJ amendment |  |  | 20,000 | 20,000 | 40,000 | $ 60,000 |  |
(Gain)/loss recorded in loss from remeasurement of development derivative liability | (2,697) | (2,770) | 68,406 | 263 | 9,104 | 736 | 62,939 | $ 10,103
Balance at fair market value | $ 217,778 | $ 220,475 | $ 223,245 | $ 130,103 | $ 109,840 | $ 60,736 | $ 217,778 | $ 130,103

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- Definition Development derivative liabilities noncurrent. + References No definition available. + Details
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- Definition Minimum payment of additional funding amount. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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