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Development Derivative Liability - Schedule of Development Derivative Liability (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Balance at fair market value, January 1,	$ 134,839
Amounts received under the SFJ agreement and SFJ amendment	20,000	$ 60,000
Loss recorded in loss from remeasurement of development derivative liability	68,406	736
Balance at fair market value, March 31,	$ 223,245	$ 60,736

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- Definition

Development derivative liabilities noncurrent.

+ References

No definition available.

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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=109980867&loc=SL5618551-113959

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