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Restructuring - Additional Information (Detail) $ in Thousands		3 Months Ended	9 Months Ended
	May 23, 2019 Position	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Restructuring And Related Activities [Abstract]
Number of positions reduced in global workforce | Position	80
Percentage of reduction in global workforce	36.00%
Restructuring completion date			Dec. 31, 2019
Accelerated depreciation charges		$ 3,000
Estimated restructuring cost remaining		$ 754	$ 754

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- Definition

Date the exit and disposal activities were completed or are expected to be completed, in CCYY-MM-DD format.

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

Reference 2: 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(a))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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Amount of expected cost remaining for the specified restructuring cost.

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The number of positions eliminated during the period as a result of restructuring activities.

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The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s).

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Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

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