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Income Taxes (Movement of valuation allowance of deferred tax assets) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Income Taxes [Abstract] |  |  |  |
Balance as of January 1 | ¥ 4,676 | $ 673 | ¥ 7,101 | ¥ 5,569
Additions | 6,838 | 985 | 2,121 | 3,153
Reversals | (112) | (16) | (4,546) | (1,621)
Balance as of December 31 | ¥ 11,402 | $ 1,642 | ¥ 4,676 | ¥ 7,101

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- Definition Amount of additions in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
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- Definition Amount of reversals in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
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- Definition Amount of valuation allowance of deferred tax asset attributable to deductible temporary differences and carryforwards, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31917-109318 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31928-109318 + Details
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