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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Statement of Comprehensive Income [Abstract] |  |  |  |
Revenues - related parties | ¥ 100 | $ 16 |  | ¥ 266
Cost of revenues - related party |  |  |  | ¥ 11,600

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