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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
	Dec. 31, 2016	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Quarterly Financial Data [Line Items]
Change in fair value of derivative liability					$ (18,886)	$ (26,278)	$ 0	$ 0
Pfizer [Member]
Quarterly Financial Data [Line Items]
Revenue recognized upon termination of Pfizer collaboration and license agreement	$ 5,600
Second Tranche Transaction [Member]
Quarterly Financial Data [Line Items]
Change in fair value of derivative liability		$ (18,900)	$ (24,000)	$ (2,300)
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

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- Definition

Revenue recognized upon termination of collaboration agreement.

+ References

No definition available.

+ Details

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- 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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