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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes |
Schedule of Group's loss before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the years ended December 31,
​ |  | 2017 | ​ | 2018 |  | 2019 |  | 2019
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
Non-PRC | ​ | (108,086) | ​ | (7,083,904) |  | (2,741,219) |  | (393,751)
PRC | ​ | (417,029) | ​ | (3,133,221) |  | (4,226,384) |  | (607,083)
​ | ​ | (525,115) | ​ | (10,217,125) |  | (6,967,603) |  | (1,000,834)
Schedule of reconciliations of the income tax expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31, |
​ |  | 2017 |  | 2018 |  | 2019 |  | 2019 |
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$ |
Loss before income tax expense |  | (525,115) | ​ | (10,217,125) |  | (6,967,603) |  | (1,000,834) | ​
PRC statutory tax rate |  | 25 | % | 25 | % | 25 | % | 25 | %
Income tax benefits at PRC statutory tax rate |  | (131,279) | ​ | (2,554,281) |  | (1,741,901) |  | (250,208) | ​
International tax rate differential |  | 27,074 | ​ | 1,779,100 |  | 735,028 |  | 105,580 | ​
Preferential tax rate | ​ | — | ​ | 197,828 | ​ | 358,796 | ​ | 51,538 | ​
Non-deductible expenses |  | 6,890 | ​ | 36,726 |  | (5,980) |  | (859) | ​
Non-taxable income |  | (11,962) | ​ | (20,973) |  | (61,151) |  | (8,784) | ​
Loss not recognized | ​ | 22,747 | ​ | — | ​ | — | ​ | — | ​
Deferred tax items tax rate differential | ​ | — | ​ | (34,236) | ​ | (570,382) | ​ | (81,930) | ​
Additional deduction of research and development expenses | ​ | — | ​ | (22,672) | ​ | (67,628) | ​ | (9,714) | ​
Change in valuation allowance |  | 86,530 | ​ | 618,508 |  | 1,353,218 |  | 194,377 | ​
Income tax expenses |  | — | ​ | — |  | — |  | — | ​
Schedule of significant components of the Group's deferred tax assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2018 |  | 2019 |  | 2019
​ | ​ | RMB | ​ | RMB | ​ | US$
Deferred tax assets | ​ | ​ | ​ | ​ | ​ | ​
Tax losses carried forward | ​ | 343,809 |  | 1,840,246 |  | 264,335
Carryforwards of non-deductible advertising expenses and donations | ​ | 424,883 | ​ | 251,829 | ​ | 36,173
Others | ​ | 13,276 | ​ | 43,111 | ​ | 6,193
Less: valuation allowance | ​ | (781,968) |  | (2,135,186) |  | (306,701)
Deferred tax assets, net | ​ | — |  | — |  | —
​

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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