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Financial instruments and fair value measurements - Investments in fixed maturity securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financial instruments and fair value measurements    
Amortized Cost $ 342,920 $ 302,950
Gross Unrealized Gains 3  
Gross Unrealized Losses (2,582) (602)
Fair Value 340,341 302,348
U.S. Treasury    
Financial instruments and fair value measurements    
Amortized Cost 104,173 80,052
Gross Unrealized Losses (1,427) (300)
Fair Value 102,746 79,752
Corporate bonds    
Financial instruments and fair value measurements    
Amortized Cost 238,747 222,898
Gross Unrealized Gains 3  
Gross Unrealized Losses (1,155) (302)
Fair Value $ 237,595 $ 222,596