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Short-term debt - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 CNY (¥) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Short-term Debt [Line Items] |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | ¥ 256,945 |
Proceeds from issuance of common stock |  |  | ¥ 256,945 | ¥ 7,313
Adjustments to Additional Paid in Capital, Warrant Issued | ¥ 13,697 |  |  |
Investor [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  | $ 10,000 |  |
Number of days from signing off of Sales and purchase agreement | 30 days | 30 days |  |
Consideration received from sale of stock | ¥ 69,861 | $ 10,000 |  |
Proceeds from issuance of common stock | 69,861 |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued | 13,697 | 1,986 |  |
Debt Issued During the Period | 56,164 | 8,143 |  |
Interest Expense, Debt | ¥ 1,674 | $ 243 |  |
Investor [Member] | Common Class A [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues | shares | 3,466,204 | 3,466,204 |  |

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