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Concentration and Risk (Details) ¥ in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 HKD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2016 CNY (¥)
Concentration and Risk
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 191,598	$ 114,082	¥ 1,263,623		¥ 1,333,872	¥ 794,218	¥ 1,102,842
PRC
Concentration and Risk
Deposits In Banks And Financial Institutions, Maximum Insurance Amount					500,000
Hong Kong
Concentration and Risk
Deposits In Banks And Financial Institutions, Maximum Insurance Amount | $				$ 500,000
RMB | PRC
Concentration and Risk
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents					654,946	429,266
U. S. Dollar | PRC
Concentration and Risk
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents					14,448	18,933
U. S. Dollar | Hong Kong
Concentration and Risk
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents					¥ 664,478	¥ 346,019
Maximum | Loan receivable balance
Concentration and Risk
Concentration Risk, Percentage	10.00%	10.00%	10.00%
Maximum | Revenue
Concentration and Risk
Concentration Risk, Percentage	10.00%	10.00%	10.00%

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The maximum amount of insurance on deposits in banks and financial institutions.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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