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Subsequent events (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Oct. 27, 2022
Oct. 13, 2022
Mar. 03, 2022
Nov. 10, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Oct. 26, 2022
Jun. 16, 2022
Mar. 31, 2022
Subsequent Event [Line Items]                      
Exercise of stock options (in shares)         174,378            
Proceeds from issuance of common stock upon exercise of stock options         $ 72,000 $ 66,000          
ELOC, right to sell common stock                   $ 150,000,000  
DWave System [Member]                      
Subsequent Event [Line Items]                      
Exercise of stock options (in shares)             105,203        
Proceeds from issuance of common stock upon exercise of stock options             $ 85,000 $ 5,000      
DWave System [Member] | Venture Loan Agreement [Member]                      
Subsequent Event [Line Items]                      
Debt Instrument, Face Amount                     $ 25,000,000
Subsequent Event                      
Subsequent Event [Line Items]                      
Exercise of stock options (in shares)       764,796              
Proceeds from issuance of common stock upon exercise of stock options       $ 696,000              
ELOC, right to sell common stock                 $ 150,000,000    
Subsequent Event | Restricted Stock Units (RSUs) [Member] | Employees                      
Subsequent Event [Line Items]                      
Awards granted (in shares) 3,578,590 4,496,833                  
Subsequent Event | Restricted Stock Units (RSUs) [Member] | Members of board of directors                      
Subsequent Event [Line Items]                      
Awards granted (in shares) 167,605                    
Subsequent Event | DWave System [Member] | Venture Loan Agreement [Member]                      
Subsequent Event [Line Items]                      
Debt Instrument, Face Amount     $ 25,000,000                
Debt Instrument, Maturity Date     Dec. 31, 2022                
Percentage of the aggregate amount of the advances made under the venture loan agreement     5.00%                
Subsequent Event | DWave System [Member] | Venture Loan Agreement [Member] | Minimum [Member]                      
Subsequent Event [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage     7.25%                
Subsequent Event | DWave System [Member] | Venture Loan Agreement [Member] | Maximum [Member]                      
Subsequent Event [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage     10.50%                
Subsequent Event | DWave System [Member] | First Tranche Loan [Member]                      
Subsequent Event [Line Items]                      
Debt Instrument, Face Amount     $ 15,000,000                
Subsequent Event | DWave System [Member] | Second Tranche Loan [Member]                      
Subsequent Event [Line Items]                      
Debt Instrument, Face Amount     5,000,000                
Subsequent Event | DWave System [Member] | Third Tranche Loan [Member]                      
Subsequent Event [Line Items]                      
Debt Instrument, Face Amount     $ 5,000,000