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Income Taxes - Summary of Reconciliations of Income Tax Expenses (Detail) ¥ / shares in Units, $ / shares in Units, ¥ 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 (¥) ¥ / shares | Dec. 31, 2020 CNY (¥) ¥ / shares
Income Tax Disclosure [Abstract] |  |  |  |
Loss before income tax expense | ¥ (329,252) | $ (47,737) | ¥ (313,762) | ¥ (91,835)
PRC statutory tax rate | 25.00% | 25.00% | 25.00% | 25.00%
Income tax benefits at PRC statutory tax rate of 25% | ¥ (82,313) | $ (11,934) | ¥ (78,440) | ¥ (22,959)
Effect of different tax rates in different jurisdictions | 32,886 | 4,768 | 31,370 | 14,347
Non-deductible expenses | 6,758 | 980 | 5,455 | 1,195
Additional deduction for qualified R&D expenses | (20,731) | (3,006) | (24,197) | (13,646)
Effect on adoption of preferential tax rate | 3 | 0 | 22 | (12)
Changes in tax rate in measurement of deferred tax | 0 | 0 | 0 | 3,345
Statutory expense | 2,151 | 312 | 2,636 | (1,855)
Others | 79 | 11 | 134 | 133
Change in valuation allowance | 61,246 | 8,880 | 63,154 | 19,658
Total income tax expenses | ¥ 79 | $ 11 | ¥ 134 | ¥ 206
Effect of preferential tax rate inside the PRC on basic and dilutive loss per share | (per share) | ¥ 0 | $ 0 | ¥ 0 | ¥ 0

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