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Intangible Assets - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Sep. 30, 2020 USD ($)
Impairment of intangible assets | ¥ 0 | ¥ 0 |
IPR&D [Member] |  |  |
Fair value of intangible asset | ¥ 26,844 |  | $ 3,954

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