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Accounts Receivable, Net - Balance of accounts receivable (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Accounts Receivable Net [Abstract] |  |  |  |  |  |
Accounts receivable, gross | ¥ 757,158 | $ 108,759 | ¥ 562,797 |  |  |
Allowance for doubtful accounts | (118,886) | (17,077) | (78,684) | $ (11,302) | ¥ (65,454) | ¥ (91,348)
Accounts receivable, net | ¥ 638,272 | $ 91,682 | ¥ 484,113 |  |  |

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