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Mainland China Employee Contribution Plan (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Mainland China Employee Contribution Plan |  |  |  |
Total expenses incurred for government statutory employee benefit plans | $ 48,038 | ¥ 334,434 | ¥ 133,699 | ¥ 30,795

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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