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Revenue from contracts with customers - Receivables, Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Contract assets:      
Trade account receivable $ 740 $ 421  
Unbilled receivables, which are included in 'Prepaid expenses and other current assets' 252 17  
Total contract assets 992 438  
Contract liabilities:      
Deferred revenue, current 1,989 2,665  
Deferred revenue, noncurrent 0 54  
Customer deposit, which are included in 'Accrued expenses and other current liabilities' 21 21  
Total contract liabilities $ 2,010 2,740  
DWave System [Member]      
Contract assets:      
Trade account receivable   421 $ 590
Unbilled receivables, which are included in 'Prepaid expenses and other current assets'   17 10
Total contract assets   438 600
Contract liabilities:      
Deferred revenue, current   2,665 4,713
Deferred revenue, noncurrent   54 0
Customer deposit, which are included in 'Accrued expenses and other current liabilities'   21 0
Total contract liabilities   $ 2,740 $ 4,713