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Income Taxes - Components and reconciliation of the income tax expense (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 |  |  |  |
Current income tax expenses or benefits | $ 0 | ¥ 0 | ¥ 0 | ¥ 0
Deferred income tax expenses or benefits | 0 | 0 | 0 | 0
Reconciliations of the income tax expenses |  |  |  |
Loss before income tax expenses | $ (1,000,834) | ¥ (6,967,603) | ¥ (10,217,125) | ¥ (525,115)
PRC statutory tax rate (in percent) | 25.00% | 25.00% | 25.00% | 25.00%
Income tax benefits at PRC statutory tax rate | $ (250,208) | ¥ (1,741,901) | ¥ (2,554,281) | ¥ (131,279)
International tax rate differential | 105,580 | 735,028 | 1,779,100 | 27,074
Preferential tax rate | 51,538 | 358,796 | 197,828 |
Non-deductible expenses | (859) | (5,980) | 36,726 | 6,890
Non-taxable income | (8,784) | (61,151) | (20,973) | (11,962)
Loss not recognized |  |  |  | 22,747
Deferred tax items tax rate differential | (81,930) | (570,382) | (34,236) |
Additional deduction of research and development expenses | (9,714) | (67,628) | (22,672) |
Change in valuation allowance | $ 194,377 | ¥ 1,353,218 | ¥ 618,508 | ¥ 86,530

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