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Principal Accounting Policies - Operating leases and Adoption of ASU (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 CNY (¥)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets, net | ¥ 85,790 |  | ¥ 0 |  | $ 12,323 |
Lease liability | ¥ 90,263 |  |  |  | $ 12,965 |
Operating lease weighted average remaining lease term | 2 years 4 months 13 days |  |  |  | 2 years 4 months 13 days |
Operating lease, weighted average discount rate | 5.60% |  |  |  | 5.60% |
Rent expense under operating lease |  |  | ¥ 37,600 | ¥ 37,000 |  |
Operating lease cost and expenses | ¥ 40,400 | $ 5,800 |  |  |  |
Short term lease cost and expenses | ¥ 1,900 | $ 300 |  |  |  |
ASU 2016-02 |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets, net |  |  |  |  |  | ¥ 99,500
Lease liability |  |  |  |  |  | ¥ 99,500

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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