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Short-term investments - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Short-term investments | $ 117,821 | $ 102,847
Time deposits [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term investments | 68,828 | 102,555
Investments in financial instruments [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term investments | $ 48,993 | $ 292

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