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Short-term investments - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Short-term investments | $ 102,847 | $ 196,538
Time deposits [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term investments | 102,555 | 141,059
Investments in financial instruments [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term investments | $ 292 | $ 55,479

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