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Organizations and Principal Activities (Details) - Schedule of consolidated financial statements of revenue - Subsidiaries [Member] ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Organizations and Principal Activities (Details) - Schedule of consolidated financial statements of revenue [Line Items] |  |  |  |
Net revenues | ¥ 846,298 | $ 129,701 | ¥ 1,147,942 | ¥ 448,508
Net loss | (396,494) | (60,765) | (736,149) | (445,155)
Net cash (used in)/provided by operating activities | 8,435 | 1,293 | (164,856) | (52,071)
Net cash (used in)/provided by investing activities | (41,915) | (6,424) | 36,329 | (29,685)
Net cash provided by/(used in) financing activities | ¥ (34,223) | $ (5,245) | ¥ 13,358 | ¥ 189,682

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