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Taxation (Details 3) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Deferred Tax Asset Valuation Allowance [Roll Forward] |  |  |  |  |  |
Balance at January 1 |  | ¥ (48,555) | $ (48,555) | ¥ (39,613) | $ (39,613) | $ (32,914)
Addition | [1] | (14,159) |  | (8,942) |  | (6,699)
Balance at December 31 |  | ¥ (62,714) | $ (62,714) | ¥ (48,555) | $ (48,555) | $ (39,613)
[1] | Additional valuation allowance was due to the increase of deferred tax assets recognised for accrued expense, other payables, advertising expenses in excess of deduction limit and net operating tax loss carry forwards.

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- Definition Deferred Tax Asset Valuation Allowance [Roll Forward]. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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