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Short-term loans (Narrative) (Details) ¥ in Thousands, $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 HKD ($)	Dec. 31, 2018 CNY (¥)
Number of loans borrowed | loan	3
Short-term deposits	$ 93,802	¥ 653,034		¥ 0
Loans Payable
Debt Instrument, Face Amount	39,000	557,000	$ 320
Line of Credit Facility, Maximum Borrowing Capacity	$ 40,000		$ 320
Short-term deposits | ¥		¥ 650,000
Debt Instrument, Maturity Date, Description	These loans were all with a maturity of less than one year
Loans Payable | Minimum
Debt Instrument, Interest Rate, Stated Percentage	2.38%	2.38%	2.38%
Loans Payable | Maximum
Debt Instrument, Interest Rate, Stated Percentage	3.77%	3.77%	3.77%

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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Number of loans borrowed under agreements with banks.

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