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Subsequent events (Details) - Convertible Debt
$ in Millions
Mar. 12, 2021
USD ($)
Subsequent Event [Line Items]  
Aggregate principal amount $ 165.0
Interest rate payable annually 1.00%
Convertible Notes | Subsequent Event  
Subsequent Event [Line Items]  
Aggregate principal amount $ 165.0
Proceeds from issuance of convertible debt $ 162.4
Interest rate payable annually 1.00%