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Income Taxes - Summary of Significant Components of Deferred Tax Assets (Labilities) (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Non-current deferred tax assets |  |  |  |  |  |
Tax losses | ¥ 203,259 | $ 29,470 | ¥ 151,160 |  | ¥ 103,721 |
Allowance for doubtful accounts | 29,288 | 4,246 | 17,376 |  | 3,047 |
Lease liabilities | 18,858 | 2,734 | 0 |  | 0 |
Welfare payables | 7,362 | 1,067 | 5,807 |  | 4,308 |
Inventory provision | 2,472 | 359 | 7,172 |  | 7,360 |
Accrued expenses and other liabilities | 1,573 | 228 | 1,329 |  | 1,354 |
Intangible assets | 23 | 3 | 43 |  | 0 |
Unrealized loss on long-term investment | 20 | 3 | 69 |  | 0 |
Unrealized profit arising from elimination of inter-company transactions | 206 | 30 | 474 |  | 466 |
Deferred government subsidies | 0 | 0 | 15 |  | 35 |
Total deferred tax assets | 263,061 | 38,140 | 183,445 |  | 120,291 |
Less: valuation allowance | (244,691) | (35,477) | (183,445) | $ (26,597) | (120,291) | ¥ (100,633)
Deferred tax assets, net of valuation allowance | 18,370 | 2,663 | 0 |  | 0 |
Non-current deferred tax liabilities |  |  |  |  |  |
Right-of-use assets | (18,370) | (2,663) | 0 |  | 0 |
Unrealized gain on long-term investment | (292) | (42) | (292) |  | (292) |
Total deferred tax liabilities | (18,662) | (2,705) | (292) |  | (292) |
Deferred tax assets (liabilities), net of valuation allowance | ¥ (292) | $ (42) | ¥ (292) |  | ¥ (292) |

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