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SHARE-BASED PAYMENTS - Summary of share-based compensation expense (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
SHARE-BASED PAYMENTS |  |  |  |
Share-based compensation expense | ¥ 181,645 | $ 25,584 | ¥ 359,835 | ¥ 434,350
Cost of revenues |  |  |  |
SHARE-BASED PAYMENTS |  |  |  |
Share-based compensation expense | 9,757 | 1,374 | 15,618 | 17,481
Selling and marketing expenses |  |  |  |
SHARE-BASED PAYMENTS |  |  |  |
Share-based compensation expense | 6,977 | 983 | 68,562 | 72,594
General and administrative expenses |  |  |  |
SHARE-BASED PAYMENTS |  |  |  |
Share-based compensation expense | 114,766 | 16,164 | 187,843 | 193,886
Research and development expenses |  |  |  |
SHARE-BASED PAYMENTS |  |  |  |
Share-based compensation expense | ¥ 50,145 | $ 7,063 | ¥ 87,812 | ¥ 150,389

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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