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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 |

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