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Revenue from contracts with customers - Change in Deferred Revenue (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Contract With Customer, Liability [Roll Forward]      
Balance at beginning of period $ 2,719 $ 4,713 $ 4,921
Deferral of revenue 2,906 4,092 4,513
Recognition of deferred revenue (3,010) (6,086) (4,721)
Balance at end of period $ 2,615 $ 2,719 $ 4,713