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Other Income (Expenses), Net - Summary of Other Income (Expenses), Net (Detail) ¥ in Thousands, $ in Thousands | 9 Months Ended
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Sep. 30, 2020 CNY (¥) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 CNY (¥)
Other Income and Expenses [Abstract] |  |  |
Fair value change of short-term investments | ¥ 2,557 | $ 377 | ¥ 332
Income of incentive payment from depository bank | 1,731 | 255 |
Net foreign exchange gains (losses) | (1,760) | (260) | 1,489
Subsidy income | 10,658 | 1,570 | 180
Fair value change of other financial assets |  |  | (145)
Gains on deconsolidation of a subsidiary (Note 7) | 407,598 | 60,033 |
Others | 116 | 17 | (98)
Other Income (Expenses), Net | ¥ 420,900 | $ 61,992 | ¥ 1,758

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