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Restructuring - Additional Information (Detail) - Position		12 Months Ended
	May 23, 2019	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Number of positions reduced in global workforce	80
Percentage of reduction in global workforce	36.00%
Restructuring completion date		Dec. 31, 2020

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- References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-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

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- Definition

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

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- Definition

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).

+ References

No definition available.

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