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Stock-based compensation - Preferred Stock Warrants (Details) - $ / shares | Sep. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2020 | Apr. 30, 2020
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Class of Warrant or Right [Line Items] |  |  |  |  |
Number of warrants outstanding (in shares) | 17,920,898 |  |  |  |
Weighted average exercise price (in usd per share) | $ 7.91 |  |  |  |
Preferred stock warrants |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Number of warrants outstanding (in shares) | 3,247,637 |  |  |  |
Weighted average exercise price (in usd per share) |  |  |  | $ 2.16 |
Number exercisable (in shares) | 1,299,055 |  |  |  |
Preferred stock warrants | DWave System [Member] |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Number of warrants outstanding (in shares) |  | 3,247,637 | 1,100,000 | 3,247,637 |
Weighted average exercise price (in usd per share) |  |  |  | $ 1.92 |
Number exercisable (in shares) |  | 1,299,055 |  |  |
Preferred stock warrants | Weighted average |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Weighted average exercise price (in usd per share) | $ 1.92 |  |  |  |
Preferred stock warrants | Weighted average | DWave System [Member] |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Weighted average exercise price (in usd per share) |  | $ 1.92 |  |  |
Common Stock Warrants [Member] | DWave System [Member] |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Number of warrants outstanding (in shares) |  | 617,972 |  |  | 617,972
Weighted average exercise price (in usd per share) |  | $ 1.75 |  |  | $ 1.75
Number exercisable (in shares) |  | 617,972 |  |  |

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- Definition Class Of Warrant Or Right, Exercisable + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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