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Financial instruments fair value - Fair Value Measurements of Other Financial Instruments (Details) - 2026 Notes - Convertible Debt - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Net Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 363,885 $ 362,031
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 305,290 $ 398,044