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Other income (expenses) - Schedule of Other Nonoperating Income by Component (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Other Income, Nonoperating [Abstract]        
Government grants ¥ 20,879 $ 3,276 ¥ 10,346 ¥ 12,546
Gain on an equity investment sold 0 0 0 6,778
Unrealized gain on equity investments held       17,298
Impairment for long-term investments (25,370) (3,981) (39,181)  
Impairment for loan receivables (528) (83) (4,500) 0
Income from ADR profit-sharing program 2,111 332 2,257 2,190
Others     264  
Total ¥ (2,908) $ (456) ¥ (30,814) ¥ 38,812