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Quarterly Financial Data - Summary of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2018	Jun. 30, 2018
Quarterly Financial Data [Line Items]
Change in fair value of derivative liability				$ (18,886)	$ (45,164)	$ (26,278)
Second Tranche Transaction [Member]
Quarterly Financial Data [Line Items]
Change in fair value of derivative liability	$ (18,900)	$ (2,300)	$ (24,000)
Overstatement (understatement) of change in fair value of derivative		$ 1,200	$ (1,200)

X

- Definition

represents the amount of overstatement (understatement) of change in fair value of derivative.

+ References

No definition available.

+ Details

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- Definition

Quarterly Financial Data [Line Items]

+ References

No definition available.

+ Details

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X

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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