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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Share-based compensation expense | ¥ 47,405 |  | ¥ 72,203 | ¥ 43,168
Research and Development Expenses |  |  |  |
Share-based compensation expense | 32,609 | $ 5,117 | 49,996 | 23,564
Selling and Marketing Expenses |  |  |  |
Share-based compensation expense | 5,666 | 889 | 10,904 | 12,322
General and Administrative Expenses |  |  |  |
Share-based compensation expense | ¥ 9,130 | $ 1,433 | ¥ 11,303 | ¥ 7,282

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