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Restructuring - Summary of Restructuring Charges by Category (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 4,019	$ 4,019
Cash [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	3,939
Non-Cash [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	80
Research and Development [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	3,926
Research and Development [Member] | Cash [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	3,846
Research and Development [Member] | Non-Cash [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	80
General and Administrative [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	93
General and Administrative [Member] | Cash [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 93

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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