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Financial Instruments - Schedule of fair value (Detail) ¥ in Thousands, $ in Thousands | Sep. 30, 2020 CNY (¥) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | ---
Fair Value, by Balance Sheet Grouping [Line Items] |  |  |
Time deposits | ¥ 817,475 | $ 120,401 | ¥ 1,325,737
Short-term investments | 237,418 | $ 34,968 | 121,126
Fair Value Recurring [Member] |  |  |
Fair Value, by Balance Sheet Grouping [Line Items] |  |  |
Time deposits | 817,475 |  | 1,325,737
Short-term investments | 237,418 |  | 121,126
Total | 1,054,893 |  | 1,446,863
Fair Value Recurring [Member] | Quoted prices in active market for identical assets (Level 1) [Member] |  |  |
Fair Value, by Balance Sheet Grouping [Line Items] |  |  |
Time deposits | 817,475 |  | 1,325,737
Total | 817,475 |  | 1,325,737
Fair Value Recurring [Member] | Significant other observable inputs (Level 2) [Member] |  |  |
Fair Value, by Balance Sheet Grouping [Line Items] |  |  |
Short-term investments | 237,418 |  | 121,126
Total | ¥ 237,418 |  | ¥ 121,126

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