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Income Taxes - Components of deferred tax assets (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Tax losses carried forward | $ 264,335 |  |  | ¥ 1,840,246 | ¥ 343,809
Carryforwards of non-deductible advertising expenses and donations | 36,173 |  |  | 251,829 | 424,883
Others | 6,193 |  |  | 43,111 | 13,276
Less: valuation allowance | (306,701) |  |  | (2,135,186) | (781,968)
Unrecognized tax benefit on interest expense | $ | 0 | $ 0 | $ 0 |  |
Unrecognized tax benefit on accumulated interest expense | $ | 0 | $ 0 |  |  |
PRC |  |  |  |  |
Taxable losses | $ 1,174,170 |  |  | 8,174,339 | 1,551,301
Undistributed earnings of subsidiaries | ¥ |  |  |  | 0 | 0
Accrued withholding tax on earnings of subsidiaries | ¥ |  |  |  | ¥ 0 | ¥ 0
Minimum |  |  |  |  |
Period for extension | 5 years |  |  |  |
Maximum |  |  |  |  |
Period for extension | 10 years |  |  |  |

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- Definition Extended period for taxable profit in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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