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Revenue from contracts with customers - Receivables, Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Contract assets:      
Trade account receivable   $ 421 $ 590
Unbilled receivables, which are included in 'Prepaid expenses and other current assets' $ 41 17 10
Total contract assets 959 438 600
Contract liabilities:      
Deferred revenue, current 2,595 2,665 4,713
Deferred revenue, noncurrent 20 54 0
Customer deposit, which are included in 'Accrued expenses and other current liabilities' 21 21 0
Total contract liabilities 2,636 2,740 4,713
DWave System [Member]      
Contract assets:      
Trade account receivable 918 421 590
Contract liabilities:      
Deferred revenue, current 2,595 2,665 4,713
Deferred revenue, noncurrent $ 20 $ 54 $ 0