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Cash and cash equivalents (Details 1) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Cash And Cash Equivalents [Line Items] |  |
Short-term investments, classified as cash equivalents | $ 210,378 | $ 327,233
Legg Mason - Western Asset Institutional Cash Reserves [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short-term investments, classified as cash equivalents | 107,625 | 181,155
JP Morgan US dollar Liquidity Fund Institutional [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short-term investments, classified as cash equivalents | $ 102,753 | $ 146,078

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- Definition A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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- Details
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