Basis of Presentation and Summary of Significant Accounting Policies - Other Narrative (Details)					3 Months Ended			9 Months Ended
	Apr. 14, 2023 USD ($) Tranche	Apr. 13, 2023 USD ($)	Feb. 13, 2023 $ / shares shares	Aug. 05, 2022 USD ($) shares	Dec. 31, 2022 shares	Sep. 30, 2022 USD ($) board_member $ / shares shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) board_member segment $ / shares shares	Sep. 30, 2021 USD ($)	Apr. 17, 2023 $ / shares	Jun. 16, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares
Accounting Policies [Line Items]
Number of board members | board_member						7		7
Common stock, par value (in usd per share) | $ / shares						$ 0.0001		$ 0.0001				$ 0.0001
Accumulated deficit						$ 364,008,000		$ 364,008,000				$ 325,268,000
Working capital						7,900,000		7,900,000
Net loss						13,311,000	$ 4,209,000	38,740,000	$ 17,705,000
Net cash outflows from operations								34,339,000	27,615,000
Cash						$ 13,764,000		13,764,000				9,483,000
Gross proceeds received from Merger				$ 49,000,000
Payment of loan obligations								$ 20,000,000	23,000
Payment of merger transaction costs				14,200,000
Right to sell common stock											$ 150,000,000
Ownership restriction percentage											9.90%
Floor stock price (in usd per share) | $ / shares											$ 1
Cap on common stock issuable per warrant						0.361		0.361
Number of operating segments | segment								1
Number of reportable segments | segment								1
Foreign currency transaction gain						$ 956,000	29,000	$ 1,322,000	538,000
Marketable investments						$ 1,200,000		$ 1,200,000				$ 1,200,000
Warrants, quoted price (in usd per share) | $ / shares						$ 0.31		$ 0.31
Warrants outstanding (in shares) | shares						17,920,898		17,920,898
SR&ED investment tax credit						$ 0	$ 500,000	$ 100,000	$ 1,200,000
Term Loan and Security Agreement [Member]
Accounting Policies [Line Items]
Maturity date								Mar. 31, 2027
Term Loan and Security Agreement [Member] | Subsequent Event
Accounting Policies [Line Items]
Aggregate principal amount		$ 50,000,000
Number of tranches | Tranche	3
Amount of non-dilutive financing		$ 25,000,000
Interest rate payable in cash		10.00%
Interest rate payable in kind		11.00%
Percentage of prepayment premium due equal to repayment of term loan prior to closing of first anniversary		3.00%
Percentage of prepayment premium due equal to repayment of term loan after first anniversary and before closing of second anniversary		2.00%
Percentage of prepayment premium due equal to repayment of term loan after second anniversary and before closing of third anniversary		1.00%
Percentage of prepayment premium due equal to repayment of term loan thereafter		0.00%
Percentage of additional prepayment premium due		10.00%
Tranche One [Member]
Accounting Policies [Line Items]
Period for cash runaway in initial tranche								2 months
Tranche One [Member] | Subsequent Event
Accounting Policies [Line Items]
Aggregate principal amount		$ 15,000,000
Proceeds from term loan	$ 15,000,000
Percentage of drawdown fee	2.00%
Tranche Two [Member] | Subsequent Event
Accounting Policies [Line Items]
Aggregate principal amount		15,000,000
Percentage of drawdown fee	2.00%
Tranche Three [Member] | Subsequent Event
Accounting Policies [Line Items]
Aggregate principal amount		$ 20,000,000
Percentage of drawdown fee	2.00%
Venture Loan [Member]
Accounting Policies [Line Items]
Payment of loan obligations				$ 21,800,000
Lincoln Park Purchase Agreement
Accounting Policies [Line Items]
Issuance of common stock (in shares) | shares				127,180				381,540
Lincoln Park Purchase Agreement | Subsequent Event
Accounting Policies [Line Items]
Issuance of common stock (in shares) | shares					13,239,654
Number of additional common shares to be registered (in shares) | shares			35,000,000
Lincoln Park Purchase Agreement | Maximum [Member] | Subsequent Event
Accounting Policies [Line Items]
Floor stock price (in usd per share) | $ / shares			$ 1
Lincoln Park Purchase Agreement | Minimum [Member] | Subsequent Event
Accounting Policies [Line Items]
Floor stock price (in usd per share) | $ / shares										$ 1
Board member designated by DCPM
Accounting Policies [Line Items]
Number of board members | board_member						1		1
Board member retained from D-Wave Systems' board
Accounting Policies [Line Items]
Number of board members | board_member						3		3
Independent board members
Accounting Policies [Line Items]
Number of board members | board_member						3		3
D-Wave Systems Existing Stockholders
Accounting Policies [Line Items]
Voting interest						91.00%		91.00%