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Income Taxes - Group's loss before income taxes (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Income Taxes |  |  |  |
Loss before income tax expenses | $ (1,000,834) | ¥ (6,967,603) | ¥ (10,217,125) | ¥ (525,115)
Non-PRC |  |  |  |
Income Taxes |  |  |  |
Loss before income tax expenses | (393,751) | (2,741,219) | (7,083,904) | (108,086)
PRC |  |  |  |
Income Taxes |  |  |  |
Loss before income tax expenses | $ (607,083) | ¥ (4,226,384) | ¥ (3,133,221) | ¥ (417,029)

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