Subsequent Events (unaudited) - Additional Information (Detail) $ in Millions	Mar. 30, 2020 USD ($)
Revenue From Collaborative Arrangement Excluding Revenue From Contract With Customer	$ 32.5
HK Tainuo [Member] \| Collaborative Arrangement [Member]
License agreement upfront payment.	$ 10.0

Amount of revenue from collaborative arrangement. Excludes revenue from contract with customer under Topic 606.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 808
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=118644919&loc=SL5834089-161433

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 808
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration