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Short-term investments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Short-term investments	$ 0	$ 744,676
Investments, allowance for credit losses		$ 0
Maturities of Time Deposits, Description	time deposits with original maturities between three months and one year.
Minimum
Schedule Of Available For Sale Securities [Line Items]
Time deposits, Maturity period	3 months
Maximum
Schedule Of Available For Sale Securities [Line Items]
Time deposits, Maturity period	1 year

X

- Definition

Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Description of time deposit maturities, including certificates of deposit.

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Period of time between issuance and maturity of customer deposits, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher SEC
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No definition available.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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