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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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