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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of cash and cash equivalents held by subsidiaries and VIEs of total cash and cash equivalents of the Group.

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No definition available.

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Time deposits represent deposits placed with banks with original maturities more than three months but less than one year.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Amount of cash restricted as to withdrawal or usage. 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.

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Significant Accounting Policies - Convenience Translation, Cash & cash equivalents and time deposits (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)
Cash and cash equivalents and time deposits
Convenience translation rate (RMB to USD)	6.5250			6.5250
Cash and cash equivalents and time deposits
Cash and cash equivalents	¥ 4,678,109,000	¥ 4,962,660,000	¥ 3,540,031,000	$ 716,952	$ 760,561		¥ 762,882,000
Time deposits	4,720,089,000	1,844,558,000	749,385,000	723,385
Restricted cash	0	0	0
PRC Subsidiaries and Variable Interest Entities
Cash and cash equivalents and time deposits
Cash and cash equivalents	¥ 2,144,500,000	¥ 1,596,000,000.0	¥ 377,800,000
Cash and cash equivalents held by PRC subsidiaries and VIEs (as a percent)	46.00%	32.00%	11.00%
Cash held in accounts managed by online payment platforms
Cash and cash equivalents and time deposits
Cash and cash equivalents	¥ 42,000,000.0	¥ 26,800,000	¥ 10,800,000
Denominated in US dollars
Cash and cash equivalents and time deposits
Cash and cash equivalents	3,798,500,000	4,674,600,000	3,305,300,000	582,200	670,100	$ 481,600
Time deposits	¥ 4,705,100,000	¥ 1,844,600,000	¥ 749,400,000	$ 721,100	$ 264,400	$ 109,200