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Subsequent Events - Additional Information (Detail) - USD ($)		12 Months Ended
	Jan. 28, 2019	Dec. 31, 2018
Maximum
Subsequent Event [Line Items]
Milestone payables		$ 1,000,000,000
Voyager Therapeutics | Collaboration and License Agreement
Subsequent Event [Line Items]
Collaborative arrangement right description		Under the terms of the agreement, on a program-by-program basis, upon the achievement of milestones or metrics specified in the agreement for VY-AADC and VY-FXN01, Voyager will have the option to co-develop and co-commercialize such program with the Company in the U.S. under cost- and profit-sharing arrangements, and Voyager agrees to forfeit certain milestones and royalties related to such program for which Voyager has exercised its co-develop and co-commercialize option.
Voyager Therapeutics | Subsequent Event | Collaboration and License Agreement
Subsequent Event [Line Items]
Up-front cash payable	$ 115,000,000
Collaborative agreement equity investment amount	50,000,000
Voyager Therapeutics | Subsequent Event | Collaboration and License Agreement | Development, Regulatory and Commercial Milestone Payment | Maximum
Subsequent Event [Line Items]
Milestone payables	$ 1,700,000,000

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- Definition

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+ References

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- Definition

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+ References

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- Definition

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 808
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434

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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

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