Liquidity and Going Concern	9 Months Ended
Liquidity and Going Concern	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Liquidity and going concern	2. Liquidity and going concern: For the nine months ended September 30, 2025, the Company reported operating losses of $10,498. Cash used in continuing operating activities was $18,694 for the nine months ended September 30, 2025 and was primarily driven by operating losses and decreases in working capital. The Company continues to use cash to support its business activities and support the growth of Cespira. As at September 30, 2025, the Company had cash and cash equivalents of $33,096 in continuing operations and long-term debt borrowed from Export Development Canada ("EDC") of $3,903, net of deferred financing fees, of which all is current. Under the term loan with EDC, the Company has a cash covenant with a consolidated cash requirement of $15,000. If the Company's cash and cash equivalents fall below the minimum cash requirement, the Company may be required to repay the outstanding amount of the term loan. On July 29, 2025, the Company closed the sale of the Light-Duty segment to a wholly-owned investment vehicle of Heliaca Investments ("Purchaser"), a Netherlands based investment firm supported by Ramphastos Investments Management B.V., a prominent Dutch venture capital and private equity firm for total consideration of $59,975 (€51,424) (note 5). On September 29, 2025, the Company filed a final short form base shelf prospectus (the "Shelf Prospectus") with the relevant Canadian securities regulatory authorities allowing the Company to offer up to USD $100,000 of common shares, preferred shares, subscription receipts, warrants, debt securities, or units, or any combination thereof during the 25-month period that the Shelf Prospectus will be effective. In connection with preparing consolidated financial statements for each annual and interim reporting period, the Company is required to evaluate whether there are conditions or events, considered in aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the consolidated financial statements are issued. Substantial doubt exists when conditions and events, considered in aggregate, indicate that it is probable a company will be unable to meet its obligations as they become due within one year after the date the consolidated financial statements are issued. This evaluation initially does not take into consideration the potential mitigating effect of management’s plans and actions that have not been fully implemented as of the date the consolidated financial statements are issued. When substantial doubt exists, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company’s ability to continue as a going concern. The mitigating effect of management’s plans, however, is only considered if both: (1) it is probable the plans will be effectively implemented within one year after the date the consolidated financial statements are issued; and (2) it is probable the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date the consolidated financial statements are issued. 2. Liquidity and going concern (continued): Based on the Company's projected capital expenditures, debt servicing obligations and operating requirements under its current business plan, management is projecting that its existing cash and cash equivalents will not be sufficient to fund its operations through the next twelve months from the date of the issuance of these condensed consolidated interim financial statements ("interim financial statements"). These conditions raise substantial doubt about the Company's ability to continue as a going concern within one year after the date these interim financial statements are issued. Management is currently evaluating several different options to improve Westport's liquidity position, including raising funds from the public markets, borrowing debt or other financing alternatives. These plans are not final and are subject to market and other conditions not in the Company's control. As such, there can be no assurances that Westport will be successful in obtaining sufficient funding. Accordingly, the Company concluded under the accounting standards that these plans do not alleviate the substantial doubt about Westport's ability to continue as a going concern. These interim financial statements have been prepared on a going concern basis, which contemplates the realization of assets and satisfaction of liabilities in the ordinary course of business. The interim financial statements do not include any adjustments related to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that may be necessary if the Company were unable to continue as a going concern.