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Loans and borrowings - Summary of Senior convertible notes (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Dec. 31, 2020
Disclosure of Detailed Information Of Senior Convertible Notes Explanatory [Line Items] |  |
Proceeds from Issue of Convertible Notes |  | $ 342,900
Senior Convertible Notes [Member] |  |
Disclosure of Detailed Information Of Senior Convertible Notes Explanatory [Line Items] |  |
Debt Instrument Maturity Date | Apr. 15, 2025 | Apr. 30, 2020
Nominal issue | $ 350,000 | $ 350,000
Borrowing costs recognised as expense |  | (7,102)
Proceeds from Issue of Convertible Notes |  | $ 342,898

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