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Subsequent Events - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Aug. 06, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Subsequent Event [Line Items]
Upfront payment		$ 3,562,000	$ 2,224,000	$ 5,715,000	$ 4,487,000
Subsequent Event | License | Neuren | North America
Subsequent Event [Line Items]
Upfront payment	$ 10,000,000
Subsequent Event | License | Neuren | Maximum | North America
Subsequent Event [Line Items]
Milestone payments payable	$ 455,000,000

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- Definition

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+ References

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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