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Investments and fair value measurements - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Exercise price of warrants (in USD per share)     $ 0.196
Fair value of warrants     $ 0.2
Impairment of strategic investment $ 2.9 $ 2.9  
Series A-1 Preferred Stock      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Issuance of convertible preferred stock, net of issuance costs (in shares)     12,595