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Summary of Significant Accounting Policy - Additional Information (Detail) $ in Thousands, ¥ in Millions	1 Months Ended		3 Months Ended
	Mar. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 CNY (¥)	Mar. 31, 2019 CNY (¥)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Restricted cash	$ 137		$ 137			$ 100	$ 137
Deferred license agreement cost	800		800
Cost incurred related to license agreement			900
Deductions for aggregate write-downs			0
Asset Impairment Charges			750
MEDINET Co Ltd Member
Summary Of Significant Accounting Policies [Line Items]
Non-refundable upfront cash payment under license agreement		$ 10,000
Remaining performance obligations	10,000		10,000
Deferred revenue			10,000
Development milestone payments	2,900		2,900		¥ 330.0
Regulatory payments	$ 1,000		7,400	¥ 720.0
Commercial Milestones Payment			$ 64,100	¥ 7,300.0

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Summary Of Significant Accounting Policies [Line Items]

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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