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Income Taxes - Components of deferred tax assets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Bad debt provision $ 63 ¥ 431 ¥ 179
Impairment of a long term investment 364 2,500 2,500
Donations 436 3,000  
Accrued expenses and other liabilities 1,505 10,345 18,766
Advertising expenses 61,360 421,883 89,529
Tax losses 50,005 343,809 52,486
Less: valuation allowance (113,733) (781,968) ¥ (163,460)
PRC      
Taxable losses $ 225,627 1,551,301  
Undistributed earnings of subsidiaries   0  
Accrued withholding tax on earnings of subsidiaries   ¥ 0