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Accounts Receivable, Net - Schedule of accounts receivable (Detail) ¥ in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Sep. 30, 2020 USD ($)
Accounts receivable, net: |  |  |
Accounts receivable | ¥ 346,326 | ¥ 202,953 |
Allowance for doubtful accounts/expected credit losses: |  |  |
Balance at the beginning of year | (2,278) | (799) |
Additional provision charged to expenses | (9,719) | (1,897) |
Write-off |  | 418 |
Balance at the end of year/period | (11,997) | (2,278) |
Total | ¥ 334,329 | ¥ 200,675 | $ 49,241

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