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Principal Accounting Policies - Share-based compensation (Details) - 12 months ended Dec. 31, 2019 ¥ in Millions, $ in Millions | CNY (¥) | USD ($)
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Accounting Policies [Abstract] |  |
Incremental compensation cost | ¥ 31.6 | $ 4.5

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- References No definition available. + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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