Westport Fuel Systems (WPRT) 40-F 25 Mar 24 2023 FY Annual report (Canada) Financial data

Cover

Cover	12 Months Ended
	Dec. 31, 2023 shares
Entity Addresses [Line Items]
Document Type	40-F
Document Registration Statement	false
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2023
Entity File Number	001-34152
Entity Registrant Name	WESTPORT FUEL SYSTEMS INC.
Entity Incorporation, State or Country Code	A0
Entity Address, Address Line One	1691 West 75th Avenue
Entity Address, City or Town	Vancouver
Entity Address, State or Province	BC
Entity Address, Country	CA
Entity Address, Postal Zip Code	V6P 6P2
City Area Code	604
Local Phone Number	718-2000
Annual Information Form	true
Audited Annual Financial Statements	true
Entity Common Stock, Shares Outstanding	17,174,502
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Document Financial Statement Error Correction [Flag]	false
ICFR Auditor Attestation Flag	true
Entity Central Index Key	0001370416
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Us Agent Contact
Entity Addresses [Line Items]
Entity Address, Address Line One	111 Eighth Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10011
City Area Code	212
Local Phone Number	590-9070
Contact Personnel Name	Dan Sceli

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Name	KPMG LLP
Auditor Location	Vancouver, BC, Canada
Auditor Firm ID	85

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents (including restricted cash, note 3(c))	$ 54,853	$ 86,184
Accounts receivable (note 4)	88,077	101,640
Inventories (note 5)	67,530	81,635
Prepaid expenses	6,323	7,760
Total current assets	216,783	277,219
Long-term investments (note 7)	4,792	4,629
Property, plant and equipment (note 8)	69,489	62,641
Operating lease right-of-use assets (note 13)	22,877	23,727
Intangible assets (note 9)	6,822	7,817
Deferred income tax assets (note 19(b))	11,554	10,430
Goodwill (note 10)	3,066	2,958
Other long-term assets (note 11)	20,365	18,030
Total assets	355,748	407,451
Current liabilities:
Accounts payable and accrued liabilities (note 12)	95,374	98,863
Current portion of operating lease liabilities (note 13)	3,307	3,379
Short-term debt (note 14)	15,156	9,102
Current portion of long-term debt (note 15)	14,108	11,698
Current portion of long-term royalty payable (note 16)	0	1,162
Current portion of warranty liability (note 17)	6,892	11,315
Total current liabilities	134,837	135,519
Long-term operating lease liabilities (note 13)	19,300	20,080
Long-term debt (note 15)	30,957	32,164
Long-term royalty payable (note 16)	0	4,376
Warranty liability (note 17)	1,614	2,984
Deferred income tax liabilities (note 19(b))	3,477	3,282
Other long-term liabilities	5,115	5,080
Total liabilities	195,300	203,485
Share capital (Adjusted, note 18):
Unlimited common shares, no par value: 151,722,963 (2019 - 144,069,972) common shares issued and outstanding	1,244,539	1,243,272
Other equity instruments	9,672	9,212
Additional paid-in-capital	11,516	11,516
Accumulated deficit	(1,074,434)	(1,024,716)
Accumulated other comprehensive loss	(30,845)	(35,318)
Total shareholders' equity	160,448	203,966
Total liabilities and shareholders' equity	355,748	407,451
Commitments and contingencies (note 21)

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Common shares par value (in dollars per share)	$ 0	$ 0
Preferred shares par value (in dollars per share)	$ 0	$ 0
Common shares, shares outstanding (in shares)	17,174,502	17,130,316
Common shares, shares issued (in shares)	17,174,502	17,130,316

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue	$ 331,799	$ 305,698
Cost of revenue and expenses:
Cost of revenue	282,862	269,496
Research and development	26,003	23,497
General and administrative	44,234	37,042
Sales and marketing	16,278	15,073
Foreign exchange loss	3,974	6,378
Depreciation and amortization (notes 8 and 9)	4,299	4,416
Loss on sale of assets	32	62
Cost of revenue and expenses	377,682	355,964
Loss from operations	(45,883)	(50,266)
Income from investments accounted for by the equity method	780	930
Gain on sale of investment (note 6)	0	19,119
Loss on extinguishment of royalty payable (note 16)	(2,909)	0
Interest on long-term debt and accretion of royalty payable	(2,981)	(3,351)
Impairment of long-term investment (note 7)	413	0
Other income, net	0	879
Interest income, net of bank charges	2,690	1,406
Loss before income taxes	(48,716)	(31,283)
Income tax expense (recovery) (note 19(a)):
Current	1,786	1,852
Deferred	(784)	(440)
Income tax expense (recovery)	1,002	1,412
Net loss for the year	(49,718)	(32,695)
Other comprehensive income (loss):
Cumulative translation adjustment	4,473	(1,824)
Comprehensive loss	$ (45,245)	$ (34,519)
Loss per share:
Net loss per share, basic (in dollars per share)	$ (2.90)	$ (1.91)
Net loss per share, diluted (in dollars per share)	$ (2.90)	$ (1.91)
Weighted average common shares outstanding:
Basic (in shares)	17,173,016	17,122,531
Diluted (in shares)	17,173,016	17,122,531

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock	Other equity instruments	Additional paid in capital	Accumulated deficit	Accumulated other comprehensive loss
Balance (in shares) at Dec. 31, 2021		17,079,932
Balance at Dec. 31, 2021	$ 236,419	$ 1,242,006	$ 8,412	$ 11,516	$ (992,021)	$ (33,494)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares on exercise of share units (in shares)		50,384
Issuance of common shares on exercise of share units	0	$ 1,266	(1,266)
Stock-based compensation	2,066		2,066
Net loss for the year	(32,695)				(32,695)
Other comprehensive income (loss)	$ (1,824)					(1,824)
Balance (in shares) at Dec. 31, 2022	17,130,316	17,130,316
Balance at Dec. 31, 2022	$ 203,966	$ 1,243,272	9,212	11,516	(1,024,716)	(35,318)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares on exercise of share units (in shares)		44,186
Issuance of common shares on exercise of share units	0	$ 1,267	(1,267)
Stock-based compensation	1,727		1,727
Net loss for the year	(49,718)				(49,718)
Other comprehensive income (loss)	$ 4,473					4,473
Balance (in shares) at Dec. 31, 2023	17,174,502	17,174,502
Balance at Dec. 31, 2023	$ 160,448	$ 1,244,539	$ 9,672	$ 11,516	$ (1,074,434)	$ (30,845)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating activities:
Net loss for the year	$ (49,718)	$ (32,695)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	12,490	11,800
Stock-based compensation expense	1,727	2,066
Foreign exchange loss	3,974	6,378
Deferred income tax	(784)	(440)
Income from investments accounted for by the equity method	(780)	(930)
Interest on long-term debt and accretion of royalty payable	9	314
Impairment on long lived assets (note 7)	413	0
Change in inventory write-downs to net realizable value (note 5)	7,066	722
Gain on sale of investment (note 6)	0	(19,119)
Net loss on sale of assets	32	62
Other income, net	0	(879)
Loss on extinguishment of royalty payable (note 16)	2,909	0
Change in bad debt expense	56	810
Changes in operating assets and liabilities:
Accounts receivable	5,340	(1,528)
Inventories	9,481	(3,505)
Prepaid expenses	2,869	(134)
Accounts payable and accrued liabilities	(2,448)	122
Warranty liability	(5,829)	2,341
Net cash used in operating activities	(13,193)	(34,615)
Investing activities:
Purchase of property, plant and equipment	(15,574)	(14,242)
Purchase of intangible assets	0	(287)
Proceeds on sale of investments (note 6)	0	31,445
Proceeds on sale of assets	161	731
Net cash (used in) provided by investing activities	(15,413)	17,647
Financing activities:
Drawings on operating lines of credit and long-term facilities	46,367	41,218
Repayment of operating lines of credit and long-term facilities	(39,904)	(55,441)
Repayment of royalty payable	(8,687)	(5,200)
Net cash used in financing activities	(2,224)	(19,423)
Effect of foreign exchange on cash and cash equivalents	(501)	(2,317)
Net decrease in cash and cash equivalents	(31,331)	(38,708)
Cash and cash equivalents, beginning of year (including restricted cash)	86,184	124,892
Cash and cash equivalents, end of year (including restricted cash)	54,853	86,184
Supplementary information:
Interest paid	2,972	3,037
Taxes paid, net of refunds	$ 2,302	$ 1,795

Company organization and operat

Company organization and operations	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Company organization and operations	1. Company organization and operations: Westport Fuel Systems Inc. (the “Company”) was incorporated under the Business Corporations Act (Alberta) on March 20, 1995. The Company is a global company focused on engineering, manufacturing, and supplying alternative fuel systems and components for transportation applications. The Company’s diverse product offerings sold under a wide range of established global brands enable the use of a number of alternative fuels in the transportation sector that provide environmental and/or economic advantages as compared to diesel, gasoline, batteries or fuel cell powered vehicles. The Company's fuel systems and associated components control the pressure and flow of alternative fuels, including liquid petroleum gas ("LPG"), compressed natural gas ("CNG"), liquified natural gas ("LNG"), renewable natural gas ("RNG") or biomethane, and hydrogen. The Company supplies its products in more than 70 countries through a network of distributors, service providers for the aftermarket and directly to original equipment manufacturers (“OEMs”) and Tier 1 and Tier 2 OEM suppliers. The Company’s products and services are available for passenger car and light-, medium- and heavy-duty truck and off-road applications.

Liquidity and Going Concern

Liquidity and Going Concern	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Liquidity and Going Concern	2. Liquidity and Going Concern: 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 that the financial statements are issued. Substantial doubt exists when conditions and events, considered in aggregate, indicate that it is probable that a company will be unable to meet its obligations as they become due within one year after the date that 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 that the 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 that the plans will be effectively implemented within one year after the date that the financial statements are issued; and (2) it is probable that 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 that the financial statements are issued. Generally, to be considered probable of being effectively implemented, the plans must have been approved before the date that the financial statements are issued. Management's evaluation has concluded that there are no known or currently foreseeable conditions or events that raise substantial doubt about the Company's ability to continue as a going concern within one year after the date these consolidated financial statements are issued. These consolidated financial statements have therefore been prepared on the basis that the Company will continue as a going concern. The assessment of the liquidity and going concern requires the Company to make judgments about the existence of conditions or events that raise substantial doubt about the ability to continue as a going concern within one year after the date that the consolidated financial statements are issued. This includes judgments about the Company's future activities and the timing thereof and estimates of future cash flows. Significant assumptions used in the Company's forecasted model of liquidity include forecasted sales, including forecasted increases in sales of the heavy-duty OEM business, forecasted costs and capital expenditures, amongst others. Changes in the assumptions could have a material impact on the forecasted liquidity and going concern assessment. The Company continues to sustain operating losses and negative cash flows from operating activities. As at December 31, 2023, the Company has cash and cash equivalents of $54,853 and during the year ended December 31, 2023, the Company used cash in operating activities of $13,193, primarily driven by operating losses of $45,883 partially offset by decreases in working capital of $9,413. The Company's short-term and long-term debt was $59,944, net of deferred financing fees, of which $29,264 matures within one year from December 31, 2023. The Company has a term loan with Export Development Canada (“EDC”). In September 2023, the Company amended the minimum cash covenant under the EDC term loan reducing the minimum cash requirement from $40,000 to $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, which was $10,763 at December 31, 2023. The Company is incurring inflationary pressure on production input costs from sourcing semiconductors, raw materials and parts, higher energy costs in operating the Company's factories and increased labor costs that are impacting margins. The Company sources components globally and is exposed to price risk and inflation risk, which may affect the Company's liquidity. 2. Liquidity and Going Concern (continued): Management is closely monitoring its financial condition and is working on initiatives to reduce its working capital and increase profitability to improve its cash flow from operating activities. The Company’s current financial projections expect meaningful collections of accounts receivable from key customers and a reduction in inventory levels across the Company’s operations. The ability to continue as a going concern beyond March 2025 will depend on the Company's ability to generate sufficient positive cash flows from its operations, specifically through working capital improvement, profitable and sustainable growth, and the Company's ability to finance its long-term strategic objectives and operations. If, as a result of future events, the Company was to determine it was no longer able to continue as a going concern, significant adjustments would be required to the carrying value of assets and liabilities in the accompanying, consolidated financial statements and the adjustments could be material.

Significant accounting policies

Significant accounting policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Significant accounting policies	3. Significant accounting policies: (a) Basis of presentation: The consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany balances and transactions have been eliminated on consolidation. These consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). (b) Foreign currency translation: The Company’s functional currency is the Canadian dollar and its reporting currency for its consolidated financial statement presentation is the United States dollar ("U.S. Dollar"). The functional currencies for the Company's subsidiaries include the following: U.S. dollar, Canadian dollar, Euro, Argentine Peso, Chinese Renminbi (“RMB”), Swedish Krona, Indian Rupee and Polish Zloty. The Company translates assets and liabilities of non-U.S. dollar functional currency operations using the period end exchange rates, shareholders’ equity balances using the weighted average of historical exchange rates, and revenues and expenses using the monthly average rate for the period with the resulting exchange differences recognized in other comprehensive income (loss). Transactions that are denominated in currencies other than the functional currencies of the Company’s or its subsidiaries' operations are translated at the rates in effect on the date of the transaction. Foreign currency denominated monetary assets and liabilities are translated to the applicable functional currency at the exchange rates in effect on the balance sheet date. Non-monetary assets and liabilities are translated at the historical exchange rate. All foreign exchange gains and losses are recognized in the consolidated statements of operations, except for the translation gains and losses arising from available-for-sale instruments, which are recorded through other comprehensive income (loss) until realized through disposal or impairment. 3. Significant accounting policies (continued): Except as otherwise noted, all amounts in these financial statements are presented in U.S. dollars. For the years presented, the Company used the following exchange rates: Year-end exchange rate as at: Average for the year ended: December 31, 2023 December 31, 2022 December 31, 2023 December 31, 2022 Canadian dollar 1.32 1.35 1.35 1.30 Euro 0.90 0.94 0.92 0.95 RMB 7.10 6.90 7.08 6.72 Polish Zloty 3.92 4.39 4.59 4.44 Swedish Krona 10.04 10.42 10.60 10.08 Indian Rupee 83.18 82.69 82.57 78.50 Argentine Peso 806.72 176.79 285.97 127.11 (c) Cash and cash equivalents (including restricted cash): Cash and cash equivalents include cash on hand, term deposits, banker acceptances and guaranteed investment certificates with maturities of ninety days or less when acquired. Cash and cash equivalents at December 31, 2023 include restricted cash of $103 (2022 - $98). Restricted cash at December 31, 2023 and 2022 is related to cash used to secure a letter of credit. (d) Accounts receivable, net: The accounts receivable balance reflects invoiced and accrued revenue and is presented net of an allowance for credit losses. The Company expects most of its accounts receivable balances to continue to come from large customers as it supplies the majority of its products and services through a network of distributors and OEMs and provides Delayed OEM ("DOEM") services. The Company establishes current expected credit losses ("CECL") for pools of assets with similar risk characteristics by evaluating historical levels of credit losses, current economic conditions that may affect a customer's ability to pay, and creditworthiness of significant customers. When specific customers are identified as no longer sharing the same risk profile as their current pool, they are removed from the pool and evaluated separately. The Company, in the normal course of business, monitors the financial condition of its customers and reviews the credit history of each new customer. When the Company becomes aware of a specific customer's inability to meet its financial obligations to the Company (such as in the case of bankruptcy filings or material deterioration in the customer's operating results or financial position, and payment experiences), the Company records a specific credit loss provision to reduce the customer's related accounts receivable to its estimated net realizable value. If circumstances related to specific customers change, the Company's estimates of the recoverability of accounts receivable balances could be further adjusted. (e) Inventories: The Company’s inventories consist of the Company’s fuel system products (finished goods), work-in-progress, purchased parts and assembled parts. Inventories are recorded at the lower of cost and net realizable value. The cost of fuel system product inventories, assembled parts and work-in-progress includes materials, labour and production overhead, including depreciation. The Company records inventory write-downs based on an analysis of excess and obsolete inventories determined primarily by future demand forecasts. In addition, the Company records a liability for firm, noncancellable, and unconditional purchase commitments with manufacturers for quantities in excess of the Company’s future demand forecast consistent with its valuation of excess and obsolete inventory. 3. Significant accounting policies (continued): (f) Property, plant and equipment: Property, plant and equipment are stated at cost. Depreciation is provided for as follows: Assets Basis Rate Buildings Straight-line 10 years Computer equipment and software Straight-line 3 years Furniture and fixtures Straight-line 5 years Machinery and equipment Straight-line 5 - 10 years Leasehold improvements Straight-line Shorter of lease term or estimated useful life Depreciation expense on machinery and equipment used in the production and manufacturing process is included in cost of revenue. All other depreciation is included in depreciation and amortization expense in the consolidated statements of operations and comprehensive loss. (g) Long-term investments: The Company accounts for investments in which it has significant influence, including variable interest entities ("VIEs") for which the Company is not the primary beneficiary, using the equity method of accounting. Under the equity method, the Company recognizes its share of income from equity accounted investees in the statement of operations with a corresponding increase in long-term investments. Any dividends paid or payable are credited against long-term investments. (h) Financial liabilities: Accounts payable and accrued liabilities, short-term debt, long-term debt and long-term royalty payable are measured at amortized cost. Transaction costs relating to long-term debt are netted against long-term debt and are amortized using the effective interest rate method. (i) Research and development costs: Research and development costs are expensed as incurred and are recorded net of funding received or receivable. (j) Intangible assets: Intangible assets consist primarily of the estimated value of intellectual property, trademarks, technology, customer contracts and non-compete agreements acquired through acquisitions. Intangible assets are amortized over their estimated useful lives, which range from 5 to 20 years. (k) Impairment of long-lived assets: The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. If such conditions exist, assets are considered impaired if the sum of the undiscounted expected future cash flows expected to result from the use and eventual disposition of an asset is less than its carrying amount. An impairment loss is measured at the amount by which the carrying amount of the asset exceeds its fair value. When quoted market prices are not available, the Company uses the expected future cash flows discounted at a rate commensurate with the risks associated with the recovery of the asset as an estimate of fair value. 3. Significant accounting policies (continued): (l) Goodwill: Goodwill is recorded at the time of purchase for the excess of the amount of the purchase price over the fair values of the identifiable assets acquired and liabilities assumed. The fair value is determined using the estimated discounted future cash flows of the reporting unit. Goodwill is not amortized and instead is tested at least annually for impairment, or more frequently when events or changes in circumstances indicate that goodwill might be impaired. This impairment test is performed annually at December 31. Future adverse changes in market conditions or poor operating results of underlying assets could result in an inability to recover the carrying value of the goodwill, thereby possibly requiring an impairment charge. (m) Warranty liability: (n) Revenue recognition: The Company generates revenues primarily from product sales. Product revenues are derived from standard product sales contracts and from long-term fixed price contracts. The Company recognizes revenue when a customer obtains control of the goods. Determining the timing of the transfer of control, at a point in time or over time, requires judgment. On standard product sales contracts, revenues are recognized when customers obtain control of the product, that is when transfer of title and risks and rewards of ownership of goods have passed and when obligation to pay is considered certain. Invoices are generated and revenue is recognized at that point in time. Provisions for warranties are made at the time of sale. Service revenue is recognized over time as performance obligations are satisfied. (o) Income taxes: The Company accounts for income taxes using the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based on the temporary differences between the accounting basis and tax basis of the assets and liabilities and for loss carry-forwards, tax credits and other tax attributes, using the enacted tax rates in effect for the years in which the differences are expected to reverse. The effect of a change in tax rates on deferred income tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company recognizes deferred income tax assets to the extent the assets are more-likely-than-not to be realized. In making such a determination, the Company considers all available positive and negative evidence including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies and results of recent operations. If it is determined that, based on all available evidence, it is more-likely-than-not that some or all of the deferred income tax assets will not be realized, a valuation allowance is provided to reduce the deferred income tax assets. 3. Significant accounting policies (continued): (o) Income taxes (continued): The Company uses a two-step process to recognize and measure the income tax benefit of uncertain tax positions taken or expected to be taken in a tax return. The tax benefit from an uncertain tax position is recognized if it is more-likely-than-not that the position will be sustained upon examination by a tax authority based solely on the technical merits of the position. A tax benefit that meets the more-likely-than-not recognition threshold is measured as the largest amount that is greater than 50% likely to be realized upon settlement with the tax authority. To the extent a full benefit is not expected to be realized, an income tax liability is established. Any change in judgment related to the expected resolution of an uncertain tax position is recognized in the year of such a change. Interest and penalties related to income taxes are included as a component of income tax expense. (p) Leases: The Company determines if an arrangement is a lease or contains a lease at inception. Operating leases with lease terms greater than 12 months are included in current and non-current assets, current and non-current liabilities in the consolidated balance sheet. Assets under finance leases are included in property, plant and equipment and the related lease liabilities in current and non-current liabilities in the consolidated balance sheets. Operating lease and finance lease right-of-use (“ROU”) assets and operating lease liabilities are recognized based on the present value of the future lease payments over the lease term at the commencement date. As the rate implicit in the lease is not readily determinable for the Company’s operating leases, an incremental borrowing rate is generally used to determine the present value of future lease payments. The incremental borrowing rate for each lease is based on the Company’s estimated borrowing rate over a similar term to that of the lease payments, adjusted for various factors including collateralization, location and currency. The operating lease expenses are recognized on a straight-line basis over the lease term and included in general and administration expenses. Short-term leases, which have an initial term of 12 months or less, are not recorded in the consolidated balance sheets. (q) Stock-based compensation: The Company measures stock-based awards at fair value on the date of the grant and expense the awards over the requisite service period of employees or consultants. The fair value of stock options is determined using the fair market value at the time of grant. The fair value of restricted stock units (“RSU”s) and Deferred Share Units (“DSU”s) are determined using the share price of the Company at the date of grant. The fair value of performance based restricted stock units (“PRSU”) is determined using the Monte Carlo Simulation Model. Stock-based compensation expense related to stock option awards is recognized over the requisite service period on a graded vesting basis. Forfeitures are accounted for as they occur. Stock-based awards are either equity settled or cash settled. Cash-settled awards are recorded as a liability based on the Company's share price on the date of grant and remeasured at the end of each reporting period over the vesting term. The Company’s estimates may be impacted by certain variables including, but not limited to, stock price volatility, employee stock option exercise behaviors, additional stock option grants, the Company’s performance and related tax impacts. 3. Significant accounting policies (continued): (r) Earnings (loss) per common share: Basic earnings or loss per share includes no potential dilution and is computed by dividing the earnings or loss attributable to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings or loss per share reflect the potential dilution of securities that could share in the earnings or loss of our Company. Dilutive securities are excluded from the calculation of our diluted weighted average common shares outstanding if their effect would be anti-dilutive based on the treasury stock method or due to a net loss from continuing operations. Common Shares that have not been released under the Company’s stock based plan or are being held in trust for purposes of the Company’s restricted stock unit program have been excluded from the calculation of basic earnings per share.

Accounts receivable

Accounts receivable	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
Accounts receivable	4. Accounts receivable: December 31, 2023 2022 Customer trade receivables $ 83,175 $ 82,533 Other receivables 6,709 19,355 Income tax receivable 1,369 818 Due from related parties (note 20) 1,671 3,974 Allowance for credit losses (4,847) (5,040) $ 88,077 $ 101,640

Inventories

Inventories	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
Inventories	5. Inventories: December 31, 2023 2022 Purchased parts and materials $ 50,770 $ 61,213 Work-in-progress 2,801 2,423 Finished goods 13,959 17,999 $ 67,530 $ 81,635

Sale of investment

Sale of investment	12 Months Ended
	Dec. 31, 2023
Discontinued Operations and Disposal Groups [Abstract]
Sale of investment	6. Sale of investment On February 7, 2022, the Company sold 100% of its shares in Cummins Westport Inc. ("CWI") to Cummins Inc. ("Cummins") for proceeds of $22,200, with Cummins continuing to operate the business as the sole owner. As part of the agreement, Cummins agreed to purchase the Company's interest in the intellectual property with proceeds to the Company of $20,000. The Company received proceeds of $31,445, net of a $10,800 holdback, after the closing date. The holdback will be retained by Cummins for a term of three years to satisfy any extended warranty obligations in excess of the recorded extended warranty obligation. Any unused amounts will be repaid to the Company at the end of three-year term and, in the event that the holdback is not sufficient to cover the extended warranty obligations, the Company may also be required to supplement this holdback amount to cover valid extended warranty claims. December 31, 2022 Proceeds from sale of investment $ 31,445 Holdback receivable 1 9,713 Less: carrying value of investment 22,039 Gain on sale of investment $ 19,119 1 Holdback receivable is included in other long-term assets in the consolidated balance sheets. 7. Long-term investments: December 31, 2023 2022 Weichai Westport Inc. (a) $ 1,411 $ 1,824 Minda Westport Technologies Limited (b) 3,234 2,657 Other equity accounted investees 147 148 $ 4,792 $ 4,629 (a) Weichai Westport Inc. ("WWI"): The Company, indirectly through its wholly-owned subsidiary, Westport Innovations (Hong Kong) Limited (“Westport HK”), is currently the registered holder of a 23.33% equity interest in WWI. In April 2016, the Company sold to Cartesian Capital Group (“Cartesian”) a derivative economic interest granting it the right to receive an amount of future income received by Westport HK from WWI equivalent to having an 18.78% equity interest in WWI and concurrently granted a Cartesian entity an option to acquire all of the equity securities of Westport HK for a nominal amount. The Company retained the right to transfer any equity interest held by Westport HK in WWI that was in excess of an 18.78% interest in the event that such option was exercised. As a result of such transactions, the Company’s residual 23.33% equity interest in WWI currently corresponds to an economic interest in WWI equivalent to 4.55%. In December 2023, the Company, through is wholly-owned subsidiary, Westport HK, signed an equity transfer agreement with WWI for the 4.55% economic interest. As at December 31, 2023, the Company recognized an impairment loss of $413 (December 31, 2022 - nil) since the fair value of the investment was assessed to be lower than the carrying amount. (b) Minda Westport Technologies Limited ("MWTL"): The Company, indirectly through its wholly owned subsidiary, Westport Fuel Systems Italia S.R.L., is currently the registered holder of a 50% equity interest in MWTL. In September 2023, the Company entered into an amended and restated joint venture agreement with Uno Minda Limited ("Minda"). The parties have agreed to enter into a share purchase agreement to sell 26% share capital held by the Company to Minda. As at December 31, 2023, the Company has assessed the carrying amount to be equal to the fair value of the investment.

Long-term investments

Long-term investments	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Long-term investments	6. Sale of investment On February 7, 2022, the Company sold 100% of its shares in Cummins Westport Inc. ("CWI") to Cummins Inc. ("Cummins") for proceeds of $22,200, with Cummins continuing to operate the business as the sole owner. As part of the agreement, Cummins agreed to purchase the Company's interest in the intellectual property with proceeds to the Company of $20,000. The Company received proceeds of $31,445, net of a $10,800 holdback, after the closing date. The holdback will be retained by Cummins for a term of three years to satisfy any extended warranty obligations in excess of the recorded extended warranty obligation. Any unused amounts will be repaid to the Company at the end of three-year term and, in the event that the holdback is not sufficient to cover the extended warranty obligations, the Company may also be required to supplement this holdback amount to cover valid extended warranty claims. December 31, 2022 Proceeds from sale of investment $ 31,445 Holdback receivable 1 9,713 Less: carrying value of investment 22,039 Gain on sale of investment $ 19,119 1 Holdback receivable is included in other long-term assets in the consolidated balance sheets. 7. Long-term investments: December 31, 2023 2022 Weichai Westport Inc. (a) $ 1,411 $ 1,824 Minda Westport Technologies Limited (b) 3,234 2,657 Other equity accounted investees 147 148 $ 4,792 $ 4,629 (a) Weichai Westport Inc. ("WWI"): The Company, indirectly through its wholly-owned subsidiary, Westport Innovations (Hong Kong) Limited (“Westport HK”), is currently the registered holder of a 23.33% equity interest in WWI. In April 2016, the Company sold to Cartesian Capital Group (“Cartesian”) a derivative economic interest granting it the right to receive an amount of future income received by Westport HK from WWI equivalent to having an 18.78% equity interest in WWI and concurrently granted a Cartesian entity an option to acquire all of the equity securities of Westport HK for a nominal amount. The Company retained the right to transfer any equity interest held by Westport HK in WWI that was in excess of an 18.78% interest in the event that such option was exercised. As a result of such transactions, the Company’s residual 23.33% equity interest in WWI currently corresponds to an economic interest in WWI equivalent to 4.55%. In December 2023, the Company, through is wholly-owned subsidiary, Westport HK, signed an equity transfer agreement with WWI for the 4.55% economic interest. As at December 31, 2023, the Company recognized an impairment loss of $413 (December 31, 2022 - nil) since the fair value of the investment was assessed to be lower than the carrying amount. (b) Minda Westport Technologies Limited ("MWTL"): The Company, indirectly through its wholly owned subsidiary, Westport Fuel Systems Italia S.R.L., is currently the registered holder of a 50% equity interest in MWTL. In September 2023, the Company entered into an amended and restated joint venture agreement with Uno Minda Limited ("Minda"). The parties have agreed to enter into a share purchase agreement to sell 26% share capital held by the Company to Minda. As at December 31, 2023, the Company has assessed the carrying amount to be equal to the fair value of the investment.

Property, plant and equipment

Property, plant and equipment	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, plant and equipment	8. Property, plant and equipment: Accumulated Net Book December 31, 2023 Cost Depreciation Value Land and buildings $ 9,206 $ 2,635 $ 6,571 Computer equipment and software 9,386 6,773 2,613 Furniture and fixtures 8,326 6,103 2,223 Machinery and equipment 129,642 75,111 54,531 Leasehold improvements 13,221 9,670 3,551 $ 169,781 $ 100,292 $ 69,489 Accumulated Net Book December 31, 2022 Cost Depreciation Value Land and buildings $ 8,455 $ 2,107 $ 6,348 Computer equipment and software 8,756 6,740 2,016 Furniture and fixtures 7,283 5,606 1,677 Machinery and equipment 115,235 66,272 48,963 Leasehold improvements 13,874 10,237 3,637 $ 153,603 $ 90,962 $ 62,641

Intangible assets

Intangible assets	12 Months Ended
	Dec. 31, 2023
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible assets	9. Intangible assets: Accumulated Intangible December 31, 2023 Cost Amortization Assets, net Patents and trademarks $ 20,417 $ 13,724 $ 6,693 Technology 4,094 3,965 129 Customer contracts 11,646 11,646 — Total $ 36,157 $ 29,335 $ 6,822 Accumulated Intangible December 31, 2022 Cost Amortization Assets, net Patents and trademarks $ 19,799 $ 12,189 $ 7,610 Technology 3,952 3,745 207 Customer contracts 11,242 11,242 — Total $ 34,993 $ 27,176 $ 7,817

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	10. Goodwill: Changes in the carrying amount of goodwill are as follows: December 31, 2023 2022 Balance, beginning of year $ 2,958 $ 3,121 Impact of foreign exchange changes 108 (163) Balance, end of year $ 3,066 $ 2,958 Goodwill of $3,066 (December 31, 2022 - $2,958), relates to the acquisition of Westport Fuel Systems Netherlands Holding B.V. (formerly known as Prins Autogassystemen Holding B.V.) in 2014. The Company completed its annual assessment of impairment and concluded that goodwill of $3,066 related to the independent aftermarket business segment was not impaired as at December 31, 2023.

Other long-term assets

Other long-term assets	12 Months Ended
	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other long-term assets	11. Other long-term assets December 31, 2023 2022 Other assets $ 9,083 $ 6,657 Prepaid capital asset deposits — 788 Property lease deposits 310 288 Holdback receivable (note 6) 10,363 10,003 Other investments 609 294 Total $ 20,365 $ 18,030

Accounts payable and accrued li

Accounts payable and accrued liabilities	12 Months Ended
	Dec. 31, 2023
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts payable and accrued liabilities	12. Accounts payable and accrued liabilities: December 31, 2023 2022 Trade accounts payable $ 70,567 $ 72,934 Accrued payroll 18,129 17,069 Taxes payable 4,302 4,425 Deferred revenue 2,376 4,435 $ 95,374 $ 98,863

Operating leases right-of-use a

Operating leases right-of-use assets and lease liabilities	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Operating leases right-of-use assets and lease liabilities	13. Operating leases right-of-use assets and lease liabilities: The Company has entered into various non-cancellable operating lease agreements primarily for its manufacturing facilities and offices. The Company's leases have lease terms expiring between 2024 and 2038. Many leases include one or more options to renew. The Company does not assume renewals in its determination of the lease term unless the renewals are deemed to be reasonably assured at lease commencement. The average remaining lease term is approximately six years and the present value of the outstanding operating lease liability was determined applying a weighted average discount rate of 3.0% based on incremental borrowing rates applicable in each location. During the year ended December 31, 2023, the Company recognized additional right-of-use assets of $1,657 in exchange for operating lease liabilities (December 31, 2022 - $699). The components of lease cost are as follows: Years ended December 31, 2023 2022 Amortization of right-of-use assets $ 3,041 $ 3,529 Interest 666 717 Total lease cost $ 3,707 $ 4,246 The maturities of lease liabilities as of December 31, 2023 are as follows: 2024 $ 3,307 2025 2,836 2026 2,586 2027 2,512 2028 2,241 Thereafter 12,433 Total undiscounted cash flows 25,915 Less: imputed interest 3,308 Present value of operating lease liabilities 22,607 Less: current portion 3,307 Long-term operating lease liabilities $ 19,300

Short-term debt

Short-term debt	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Short-term debt	14. Short-term debt: December 31, 2023 2022 Revolving financing facilities $ 15,156 $ 9,102

Long-term debt

Long-term debt	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Long-term debt	15. Long-term debt: December 31, 2023 2022 Term loan facilities, net of debt issuance costs (a) $ 42,879 $ 41,934 Other bank financing (b) 531 512 Capital lease obligations (c) 1,655 1,416 Balance, end of year 45,065 43,862 Less: current portion 14,108 11,698 Long-term portion $ 30,957 $ 32,164 (a) On December 13, 2021, the credit facility and non-revolving term facility with Export Development Canada ("EDC") were refinanced into one $20,000 term loan. The refinanced term loan provides an extension of the maturity to September 15, 2026, an interest rate of U.S. Prime Rate plus 2.01% per annum and both principal and interest repayments are quarterly. The Company incurred costs of $300 related to this amendment, which are being amortized over the remainder of the loan term from the debt modification date using the effective interest rate method. As at December 31, 2023, the amount outstanding for this loan was $10,763 net of transaction costs (December 31, 2022 - $14,683). The loan is secured by share pledges over Westport Fuel Systems Canada Inc., Fuel Systems Solutions, Inc., Westport Luxembourg S.a.r.l and by certain of the Company's property, plant and equipment. On October 9, 2018 and November 28, 2019, the Company entered into Euro denominated loan agreements with UniCredit S.p.A. ("UniCredit"). On April 29, 2021, the Company and UniCredit amended the terms of these Euro denominated loan agreements to combine the facilities into one $8,803 loan facility. This loan matures on March 31, 2027, bears interest at an annual rate of 1.65%, and interest is paid quarterly. As at December 31, 2023, the amount outstanding for this loan was $6,793 (December 31, 2022 - $8,044). On May 20, 2020, the Company entered into a Euro denominated loan agreement with UniCredit. The effective interest rate of this loan is 1.70% with a maturity date of May 31, 2025. As at December 31, 2023, the amount outstanding for this loan was $1,693 (December 31, 2022 - $2,699). There is no security on the loan as it was made as part of the Italian government's COVID-19 Decreto Liquidità to help Italian companies to secure liquidity to continue operating while mitigating some of the impact of COVID-19. On July 17, 2020, the Company entered into a Euro denominated loan agreement with UniCredit. The effective interest rate of this loan is 1.75% with a maturity date of July 31, 2026. As at December 31, 2023, the amount outstanding for this loan was $8,313 (December 31, 2022 - $11,273). There is no security on the loan as it was made as part of the Italian government’s COVID-19 Decreto Liquidità. On August 11, 2020, the Company entered into a Euro denominated loan agreement with Deutsche Bank. The effective interest rate of this loan is 1.7% with a maturity date of August 31, 2026. As at December 31, 2023, the amount outstanding for this loan was $3,867 (December 31, 2022 - $5,235). There is no security on the loan as it was made as part of the Italian government’s COVID-19 Decreto Liquidità. On November 28, 2023, the Company entered into a Euro denominated loan agreement with Banca de Credito Cooperativo. The loan matures on December 31, 2028, bears interest at the 3-month Euribor rate plus 1.75% and both interest and principle repayments are quarterly. As at December 31, 2023, the amount outstanding for this loan was $2,192 (December 31, 2022 - nil). There is no security on the loan as it was made as part of the Italian government's guarantee program administered by the Servizi Assicurativi del Commercio Estero ("SACE"). 15. Long-term debt (continued): On November 29, 2023, the Company entered into a Euro denominated loan agreement with Deutsche Bank. The loan matures on September 30, 2029, bears interest at the 3-month Euribor rate plus 1.90% and both interest and principle repayments are quarterly. As at December 31, 2023, the amount outstanding for this loan was $7,710 (December 31, 2022 - nil). There is no security on the loan as it was made as part of the Italian government's SACE guarantee program. On December 4, 2023, the Company entered into a Euro denominated loan agreement with Rabobank. The loan matures on December 31, 2028, bears interest at an annual rate of 4.70% and repayments are monthly. As at December 31, 2023, the amount outstanding for this loan was $1,548 (December 31, 2022 - nil). The loan is secured by certain property owned by the Company. The Company has entered into interest rate swaps with Unicredit and Deutsche Bank, which are directly associated with its Unicredit (2020 and 2021) and Deutsche Bank (2020) term loans. These interest rate swaps serve as a hedging mechanism against potential fluctuations in future interest rates, ensuring stability in loan repayments. As of December 31, 2023, the Unicredit interest rate swaps have maturity dates ranging from 2025 to 2027 and a total notional value of $16,731. Additionally, the Deutsche Bank interest rate swap has a maturity date of June 30, 2027, with a notional value of $3,871. The notional value of these interest rate swaps is adjusted concurrently with scheduled principal payments on the corresponding loans. These interest rate swaps have been designated as cash flow hedges and have been structured to be highly effective. As of December 31, 2023, the fair value of the interest rate swaps amounted to $822, which is included in other long-term assets (December 31, 2022 - $1,612). (b) Other bank financing consists of an unsecured bank financing arrangement with an interest rate of 0.55% and matures in 2027. (c) The Company has capital lease obligations that have terms of two Throughout the term of certain of these financing arrangements, the Company is required to meet certain financial and non-financial covenants. As of December 31, 2023, the Company is in compliance with all covenants under the financing arrangements. The principal repayment schedule of long-term debt is as follows as at December 31, 2023: Term loan facilities Other bank financing Capital lease obligations Total 2024 $ 13,396 $ 133 $ 579 $ 14,108 2025 13,670 133 405 14,208 2026 9,733 133 194 10,060 2027 2,793 132 182 3,107 2028 and thereafter 3,287 — 295 3,582 $ 42,879 $ 531 $ 1,655 $ 45,065

Long-term royalty payable

Long-term royalty payable	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Long-term royalty payable	16. Long-term royalty payable: December 31, 2023 2022 Balance, beginning of year $ 5,538 $ 9,947 Accretion expense 240 791 Repayment (8,687) (5,200) Loss on extinguishment 2,909 — Balance, end of year — 5,538 Less: current portion — 1,162 Long-term portion $ — $ 4,376 In April 2023, the Company and Cartesian Capital Group ("Cartesian") entered into a settlement agreement to terminate the Tranche 1 Financing and the Consent Agreement in exchange for mutual releases and cash consideration, which included the release of the security interest in the Company's HPDI 2.0 TM fuel system intellectual property. The Company repaid Cartesian $8,687 on April 3, 2023 and recorded a $2,909 loss on extinguishment during the year ended December 31, 2023.

Warranty liability

Warranty liability	12 Months Ended
	Dec. 31, 2023
Product Warranties Disclosures [Abstract]
Warranty liability	17. Warranty liability: A continuity of the warranty liability is as follows: Years ended December 31, 2023 2022 Balance, beginning of year $ 14,299 $ 18,791 Warranty claims (6,826) (11,081) Warranty accruals 5,152 4,338 Change in estimate (2,204) 3,559 Impact of foreign exchange changes (1,915) (1,308) Balance, end of year 8,506 14,299 Less: current portion 6,892 11,315 Long-term portion $ 1,614 $ 2,984

Share capital, stock options an

Share capital, stock options and other stock-based plans	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Share capital, stock options and other stock-based plans	18. Share capital, stock options and other stock-based plans: On June 1, 2023, the Company completed a consolidation of its issued and outstanding common shares on the basis of one new post-consolidation common share for every ten existing pre-consolidation common shares (the "Consolidation"). No fractional common shares were issued and any fractional shares were rounded down to the nearest whole common shares. The number of outstanding common shares and share units issued have been retroactively adjusted for all periods presented. During the year ended December 31, 2023, the Company issued 44,186 common shares, net of cancellations, upon exercises of share units (year ended December 31, 2022 – 50,384 common shares). The Company issues shares from treasury to satisfy share unit exercises. (a) Share Units ("Units"): The value assigned to issued Units and the amounts accrued are recorded as other equity instruments. As Units are exercised or vested and the underlying shares are issued from treasury of the Company, the value is reclassified to share capital. During the year ended December 31, 2023, the Company recognized $1,727 (year ended December 31, 2022 - $2,066) of stock-based compensation associated with the Westport Omnibus Plan. The Westport Omnibus Plan aims to advance the Company's interests by encouraging employees, consultants and non-employee directors to receive equity-based compensation and incentives. The plan outlines the stock-based options types, eligibility and vesting terms. A continuity of the Units issued under the Westport Omnibus Plan are as follows: December 31 December 31 2023 2022 Number of Weighted Number of Weighted Outstanding, beginning of year 317,432 $ 24.15 186,643 $ 29.80 Granted 435,128 13.78 254,109 18.32 Vested and exercised (44,186) 38.76 (50,384) 31.94 Forfeited/expired (229,731) 19.26 (72,936) 12.77 Outstanding, end of year 478,643 $ 15.68 317,432 $ 24.15 Units outstanding and exercisable, end of year — — — — During the year ended December 31, 2023, 435,128 share units were granted to directors, executives and employees (year ended December 31, 2022 - 254,109). This included 147,557 Restricted Share Units ("RSUs") (year ended December 31, 2022 - 99,470) and 185,365 Performance Share Units ("PSUs") (year ended December 31, 2022 - 122,139) and 102,206 Deferred Share Units ("DSUs") (year ended December 31, 2022 - 32,500 DSUs). Values of PSUs are determined using the Monte – Carlo Simulation Model. RSUs typically vest over a three-year period so the actual value received by the individual depends on the share price on the day such RSUs are settled for common shares, not the date of grant. PSU awards do not have a certain number of common shares that will be issued over time but are based on future performance and other conditions tied to the payout of the PSU. Vesting of DSUs shall occur immediately prior to the resignation, retirement or termination of directorship, in accordance with the terms of Westport's Omnibus Plan. For the year ended December 31, 2023 the Company awarded 102,206 DSU's to be cash-settled when the vesting conditions are met (year ended December 31, 2022 - 32,500 to be equity -settled when the vesting conditions are met). As at December 31, 2023, $2,054 of compensation expense related to Units has yet to be recognized in results from operations and will be recognized ratably over two years. (b) Aggregate intrinsic values: The aggregate intrinsic value of the Company’s share units are as follows: December 31, 2023 2022 CDN$ CDN$ Share units: Outstanding $ 3,283 $ 3,310 Exercisable — — Exercised 386 524 (c) Stock-based compensation: Stock-based compensation associated with the Unit plans is included in operating expenses as follows: Years ended December 31, 2023 2022 Cost of revenue $ 26 $ 184 Research and development 570 336 General and administrative 1,806 1,638 Sales and marketing 228 232 $ 2,630 $ 2,390 For the year ended December 31, 2023 the Company recognized stock-based compensation of $1,727 (December 31, 2022 - $2,066) for stock-based awards settled in shares and stock-based compensation of $903 for stock-based awards settled in cash for the year ended (year ended December 31, 2022 - $324).

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income taxes	19. Income taxes: (a) The Company’s income tax provision differs from that calculated by applying the combined enacted Canadian federal and provincial statutory income tax rate of 27% for the year ended December 31, 2023 (year ended December 31, 2022 – 27%) as follows: Years ended December 31, 2023 2022 Expected income tax expense (recovery) $ (13,153) $ (8,446) Non-deductible stock-based compensation 301 233 Other permanent differences 86 5 Withholding taxes and other foreign taxes 709 621 Change in enacted tax rates 221 294 Foreign tax rate differences, foreign exchange and other adjustments 103 392 Change in valuation allowance 9,505 (3,249) Expired losses 1,445 11,562 Foreign-derived income inclusion 1,785 — Income tax expense (recovery) $ 1,002 $ 1,412 19. Income taxes (continued): (b) The significant components of the deferred income tax assets and liabilities are as follows: December 31, 2023 2022 Deferred income tax assets: Net loss carry forwards $ 225,659 $ 208,399 Intangible assets 3,854 4,015 Property, plant and equipment 20,292 18,392 Warranty liability 2,017 3,631 Foreign tax credits 620 620 Inventory 3,271 1,933 Research and development 5,074 5,001 Tax realignment due to Italian tax law changes 9,353 7,713 Financing and share issuance cost 767 1,106 Other 9,224 8,859 Total gross deferred income tax assets 280,131 259,669 Valuation allowance (268,577) (249,239) Total deferred income tax assets $ 11,554 $ 10,430 Deferred income tax liabilities: Intangible assets $ (430) $ (430) Property, plant and equipment (306) (15) Other (2,741) (2,837) Total deferred income tax liabilities $ (3,477) $ (3,282) Total net deferred income tax assets $ 8,077 $ 7,148 The valuation allowance is reviewed on a quarterly basis to determine if, based on all available evidence, it is more-likely-than-not that some or all of the deferred income tax assets will not be realized. The ultimate realization of deferred income tax assets is dependent on the generation of sufficient taxable income during the future periods in which those temporary differences are expected to reverse. If the evidence does not exist that the deferred income tax assets will be fully realized, a valuation allowance has been provided. The deferred income tax assets have been reduced by the uncertain tax position presented in note 19(f). 19. Income taxes (continued): (c) The components of the Company’s income tax expense (recovery) are as follows: Income tax expense (recovery) Net income (loss) before income taxes Current Deferred Total Year ended December 31, 2023 Italy $ 4,531 $ 84 $ (828) $ (744) United States (4,088) 14 — 14 Canada (40,934) 590 — 590 Netherlands 3,391 744 (25) 719 Poland 2,228 253 69 322 Other (13,844) 101 — 101 $ (48,716) $ 1,786 $ (784) $ 1,002 Year ended December 31, 2022 Italy $ 1,023 $ 20 $ (511) $ (491) United States 15,136 6 — 6 Canada (46,657) 372 — 372 Netherlands 3,103 601 (25) 576 Poland 3,002 512 118 630 Other (6,890) 341 (22) 319 $ (31,283) $ 1,852 $ (440) $ 1,412 (d) The Company has loss carry-forwards in various tax jurisdictions available to offset future taxable income that expire in the following years, as follows: 2024 2025 2026 2027 and later Total Canada $ — $ — $ — $ 660,110 $ 660,110 Italy — — — 15,670 15,670 United States — — — 72,311 72,311 Sweden — — — 10,976 10,976 China 921 2,203 — 3,295 6,419 India — — — 5,354 5,354 Australia and Other — — 205 7,463 7,668 Total $ 921 $ 2,203 $ 205 $ 775,179 $ 778,508 Certain tax attributes are subject to an annual limitation as a result of the acquisition of Fuel Systems which constitutes a change of ownership as defined under Internal Revenue Code Section 382. (e) The Company has not recognized a deferred income tax liability for certain undistributed earnings of foreign subsidiaries which are essentially investments in those foreign subsidiaries and are permanent in duration. 19. Income taxes (continued): (f) The Company records uncertain tax positions in accordance with ASC No. 740, Income Taxes. As at December 31, 2023, the total amount of the Company’s uncertain tax benefits was $5,552 (December 31, 2022 - $5,352). If recognized in future periods, the uncertain tax benefits would affect our effective tax rate. The Company files income tax returns in Canada, the U.S., Italy, and various other foreign jurisdictions. All taxation years remain open to examination by the Canada Revenue Agency, the 2020 to 2023 taxation years remain open to examination by the Internal Revenue Service, the 2018 to 2023 taxation years remain open to examination by the Italian Revenue Agency, and various years remain open in the other foreign jurisdictions.

Related party transactions

Related party transactions	12 Months Ended
	Dec. 31, 2023
Related Party Transactions [Abstract]
Related party transactions	20. Related party transactions: The Company's related parties are Minda Westport Technologies Limited, directors, officers and shareholders that own greater than 10% of the Company's shares.

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	21. Commitments and contingencies: (a) Contractual commitments The Company is a party to a variety of agreements in the ordinary course of business under which it is obligated to indemnify a third party with respect to certain matters. Typically, these obligations arise as a result of contracts for sale of the Company’s product to customers where the Company provides indemnification against losses arising from matters such as product liabilities. The potential impact on the Company’s financial results is not subject to reasonable estimation because considerable uncertainty exists as to whether claims will be made and the final outcome of potential claims. To date, the Company has not incurred significant costs related to these types of indemnifications. (b) Contingencies The Company is engaged in certain legal actions and tax audits in the ordinary course of business and believes that, based on the information currently available, the ultimate outcome of these actions will not have a material adverse effect on our operating results, liquidity or financial position.

Segment information

Segment information	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Segment information	22. Segment information: The Company manages and reports the results of its business through three segments: OEM, Independent Aftermarket ("IAM"), and Corporate. This reflects the manner in which operating decisions and assessing business performance is currently managed by the Chief Operating Decision Maker ("CODM"). . Financial information by business segment as follows: Year ended December 31, 2023 Revenue Operating income (loss) Depreciation & amortization Equity income OEM $ 222,741 $ (31,222) $ 9,471 $ 780 IAM 109,058 2,583 2,479 — Corporate — (17,244) 540 — Total consolidated $ 331,799 $ (45,883) $ 12,490 $ 780 Year ended December 31, 2022 Revenue Operating income (loss) Depreciation & amortization Equity income OEM $ 198,036 $ (32,000) $ 8,205 $ 930 IAM 107,662 2,340 3,162 — Corporate — (20,606) 433 — Total consolidated $ 305,698 $ (50,266) $ 11,800 $ 930 Years ended December 31, 2023 2022 Total additions to long-lived assets, excluding business combinations: OEM $ 13,285 $ 11,178 IAM 1,613 2,754 Corporate 676 597 Total consolidated $ 15,574 $ 14,529 Revenues are attributable to geographical regions based on the location of the Company’s customers and are presented as a percentage of the Company's revenues, as follows: % of total revenue Years ended December 31, 2023 2022 Europe 70 % 64 % Americas 13 % 12 % Asia 10 % 15 % Africa 3 % 5 % Other 4 % 4 % During the year ended December 31, 2023, total revenue of $53,671 (year ended December 31, 2022 - $43,265), or 16% (year ended December 31, 2022 - 14%) of total revenue, was generated from the Company's OEM launch partner. As at December 31, 2023, total goodwill of $3,066 (December 31, 2022 - $2,958) was allocated to the IAM segment. As at December 31, 2023, total long-term investments of $1,558 (December 31, 2022 - $1,972) were allocated to the Corporate segment and $3,234 (December 31, 2022 - $2,657) to the OEM segment. Total assets are allocated as follows : Total assets by operating segment Years ended December 31, 2023 2022 OEM $ 201,348 $ 241,795 IAM 145,640 145,377 Corporate 8,760 20,279 Total consolidated assets $ 355,748 $ 407,451 The Company’s long-lived assets consist of property, plant and equipment, intangible assets and goodwill. Long-lived assets information by geographic area: December 31, 2023 Property, plant and equipment Intangible assets and goodwill Total Italy $ 25,883 $ 6,705 $ 32,588 Canada 24,098 117 24,215 Rest of Europe 11,042 3,066 14,108 Asia Pacific 8,466 — 8,466 Total consolidated long-lived assets 69,489 9,888 79,377 December 31, 2022 Property, plant and equipment Intangible assets and goodwill Total Italy $ 20,382 $ 7,688 $ 28,070 Canada 25,199 129 25,328 Rest of Europe 9,032 2,958 11,990 Asia Pacific 8,028 — 8,028 Total consolidated long-lived assets $ 62,641 $ 10,775 $ 73,416

Financial instruments

Financial instruments	12 Months Ended
	Dec. 31, 2023
Financial Instruments Disclosure [Abstract]
Financial instruments	23. Financial instruments: Financial risk management The Company has exposure to liquidity risk, credit risk, foreign currency risk and interest rate risk. Liquidity risk Liquidity risk is the risk that the Company will not be able to meet its financial obligations as they are due. The Company has a history of losses and negative cash flows from operations since inception. At December 31, 2023, the Company has $54,853 of cash, cash equivalents and short-term investments, including $103 in restricted cash (see note 3(c)). The following are the contractual maturities of financial obligations as at December 31, 2023: Carrying Contractual < 1 year 1-3 years 4-5 years >5 years Accounts payable and accrued liabilities $ 95,374 $ 95,374 $ 95,374 $ — $ — $ — Short-term debt (note 14) 15,156 15,156 15,156 — — — Term loan facilities (note 15(a)) 42,879 47,689 15,873 25,538 5,212 1,066 Other bank financing (note 15(b)) 531 538 139 133 133 133 Capital lease obligations (note 15(c)) 1,655 1,670 596 598 182 294 Operating lease commitments (note 13) 22,607 25,915 3,307 5,422 4,753 12,433 $ 178,202 $ 186,342 $ 130,445 $ 31,691 $ 10,280 $ 13,926 Credit risk Credit risk arises from the potential that a counterparty to a financial instrument fails to meet its contractual obligations and arises principally from the Company’s cash and cash equivalents, short-term investments and accounts receivable. The Company manages credit risk associated with cash and cash equivalents by regularly investing primarily in liquid short-term paper issued by major banks. The Company monitors its portfolio and its policy is to diversify its investments to manage this potential risk. The Company is also exposed to credit risk with respect to uncertainties as to timing and amount of collectability of accounts receivable and other receivables. As at December 31, 2023, 88% (December 31, 2022 - 76%) of accounts receivable relate to customer receivables, and 12% (December 31, 2022 - 24%) relates to amounts due from related parties and income tax authorities for value added taxes and other tax related refunds. In order to minimize the risk of loss for customer receivables, the Company’s extension of credit to customers involves review and approval by senior management as well as progress payments as contracts are executed. Most sales are invoiced with payment terms in the range of 30 days to 90 days. Refer to note 3(d) for the Company's policy with respect to an allowance for credit losses. Foreign currency risk Foreign currency risk is the risk that the fair value of future cash flows of financial instruments will fluctuate because of changes in foreign currency exchange rates. The Company conducts a significant portion of its business activities in foreign currencies, primarily the U.S. dollar and the Euro. The Company are subject to foreign currency exchange rate risk to the extent that our costs are denominated in currencies other than those in which the Company earn revenues. In addition, since the Company's consolidated financial statements are denominated in U.S. dollars, changes in foreign currency exchange rates between the U.S. dollar and other currencies have had, and will continue to have, an impact on the Company's results of operations, financial condition and cash flows. Cash and cash equivalents, short-term investments, accounts receivable, accounts payable, and long-term debt that are denominated in foreign currencies will be affected by changes in the exchange rate between the Canadian dollar and these foreign currencies. The Company’s functional currency is the Canadian dollar. A 5% increase/decrease in the relative value of the U.S. dollar against the Canadian dollar and Euro compared to the exchange rates in effect for the year ended December 31, 2023 would have resulted in lower/higher income from operations of approximately $100. This assumes a consistent 5% appreciation in the U.S. dollar against the Canadian dollar and the Euro throughout the fiscal year. The timing of changes in the relative value of the U.S. dollar can affect the magnitude of the impact that fluctuations in foreign exchange rates have on our income from operations. Interest rate risk Interest rate risk is the risk that the fair value of future cash flows of a financial instrument will fluctuate because of changes in market interest rates. The Company is subject to interest rate risk on certain short-term and long-term debt with variable rates of interest. The Company limits its exposure to interest rate risk by entering into interest rate swaps that serve as a hedging mechanism against potential fluctuations in future interest rates on certain financial instruments and continually monitoring and adjusting portfolio duration to align to forecasted cash requirements and anticipated changes in interest rates. If interest rates for the year ended December 31, 2023 had increased or decreased by 200 basis points, with all other variables held constant, net loss for the year ended December 31, 2023 would have increased or decreased by $716. 23. Financial instruments (continued): Fair value of financial instruments The carrying amounts reported in the balance sheets for cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the short-term period to maturity of these instruments. The long-term investments represent the Company's interests in Minda Westport Technologies Limited, Weichai Westport Inc.and other investments. Minda Westport Technologies Limited is the most significant of the investments and is accounted for using the equity method. WWI and other investments are accounted for at fair value. The carrying values reported in the consolidated balance sheets for obligations under capital and operating leases, which are based upon discounted cash flows, approximate their fair values. The carrying values of the term loan facilities, and other bank financing included in the long-term debt (note 15) are carried at amortized costs, which approximate their respective fair values as at December 31, 2023. The Company categorizes its fair value measurements for items measured at fair value on a recurring basis into three categories as follows: Level 1 – Unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 – Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 – Inputs for the asset or liability that are not based on observable market data (unobservable inputs). When available, the Company uses quoted market prices to determine fair value and classify such items in Level 1. When necessary, Level 2 valuations are performed based on quoted market prices for similar instruments in active markets and/or model–derived valuations with inputs that are observable in active markets. Level 3 valuations are undertaken in the absence of reliable Level 1 or Level 2 information. As at December 31, 2023, cash and cash equivalents are measured at fair value on a recurring basis and are included in Level 1.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	24. Subsequent Events Long-term debt On January 10, 2024, the Company entered into a Euro denominated loan agreement with UniCredit for $3,835. The loan matures on December 31, 2028, bears interest at the 3-month Euribor rate plus 1.52% and both interest and principle repayments are quarterly, with the first payment due in 2025. There is no security on the loan as it was made as part of the Italian government's guarantee program administered by the Servizi Assicurativi del Commercio Estero ("SACE"). HPDI Joint Venture On March 11, 2024, the Company entered into agreements to establish a joint venture ("JV") with the Volvo Group. As part of the formation of the JV, the Company will contribute certain HPDI™ assets and liabilities, including related fixed assets, intellectual property, and net working capital. The Volvo Group will acquire a 45% interest in the JV for an initial consideration of $28,350. The JV is to be jointly controlled by both parties, and is intended to enhance the commercialization of Westport’s HPDI™ fuel system technology and to accelerate the decarbonization efforts of global OEM customers. Upon closing of the JV with Volvo Group, the HPDI business will be operated through the joint venture. The Company's preliminary assessment is the interest in the JV is to be accounted for using the equity method. Under this method, the Company's initial investment in the JV is recognized at cost and subsequently adjusted for the Company's share of the JV's net income or loss and other comprehensive income, as well as for dividends or distributions received from the JV. The Company's financial statements do not reflect the effects of the JV formation and share sale as of the reporting date. An estimate of the financial impact cannot be made, however these transactions are expected to have a material impact on the Company's financial position, results of operations, and cash flows in future periods.

Significant accounting polici_2

Significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation: The consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany balances and transactions have been eliminated on consolidation. These consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”).
Foreign currency translation	Foreign currency translation: The Company’s functional currency is the Canadian dollar and its reporting currency for its consolidated financial statement presentation is the United States dollar ("U.S. Dollar"). The functional currencies for the Company's subsidiaries include the following: U.S. dollar, Canadian dollar, Euro, Argentine Peso, Chinese Renminbi (“RMB”), Swedish Krona, Indian Rupee and Polish Zloty. The Company translates assets and liabilities of non-U.S. dollar functional currency operations using the period end exchange rates, shareholders’ equity balances using the weighted average of historical exchange rates, and revenues and expenses using the monthly average rate for the period with the resulting exchange differences recognized in other comprehensive income (loss). Transactions that are denominated in currencies other than the functional currencies of the Company’s or its subsidiaries' operations are translated at the rates in effect on the date of the transaction. Foreign currency denominated monetary assets and liabilities are translated to the applicable functional currency at the exchange rates in effect on the balance sheet date. Non-monetary assets and liabilities are translated at the historical exchange rate. All foreign exchange gains and losses are recognized in the consolidated statements of operations, except for the translation gains and losses arising from available-for-sale instruments, which are recorded through other comprehensive income (loss) until realized through disposal or impairment.
Cash and cash equivalents (including restricted cash)	Cash and cash equivalents (including restricted cash): Cash and cash equivalents include cash on hand, term deposits, banker acceptances and guaranteed investment certificates with maturities of ninety days or less when acquired. Cash and cash equivalents at December 31, 2023 include restricted cash of $103 (2022 - $98). Restricted cash at December 31, 2023 and 2022 is related to cash used to secure a letter of credit.
Accounts receivable, net	Accounts receivable, net: The accounts receivable balance reflects invoiced and accrued revenue and is presented net of an allowance for credit losses. The Company expects most of its accounts receivable balances to continue to come from large customers as it supplies the majority of its products and services through a network of distributors and OEMs and provides Delayed OEM ("DOEM") services. The Company establishes current expected credit losses ("CECL") for pools of assets with similar risk characteristics by evaluating historical levels of credit losses, current economic conditions that may affect a customer's ability to pay, and creditworthiness of significant customers. When specific customers are identified as no longer sharing the same risk profile as their current pool, they are removed from the pool and evaluated separately. The Company, in the normal course of business, monitors the financial condition of its customers and reviews the credit history of each new customer. When the Company becomes aware of a specific customer's inability to meet its financial obligations to the Company (such as in the case of bankruptcy filings or material deterioration in the customer's operating results or financial position, and payment experiences), the Company records a specific credit loss provision to reduce the customer's related accounts receivable to its estimated net realizable value. If circumstances related to specific customers change, the Company's estimates of the recoverability of accounts receivable balances could be further adjusted.
Inventories	Inventories:The Company’s inventories consist of the Company’s fuel system products (finished goods), work-in-progress, purchased parts and assembled parts. Inventories are recorded at the lower of cost and net realizable value. The cost of fuel system product inventories, assembled parts and work-in-progress includes materials, labour and production overhead, including depreciation. The Company records inventory write-downs based on an analysis of excess and obsolete inventories determined primarily by future demand forecasts. In addition, the Company records a liability for firm, noncancellable, and unconditional purchase commitments with manufacturers for quantities in excess of the Company’s future demand forecast consistent with its valuation of excess and obsolete inventory.
Property, plant and equipment	Property, plant and equipment: Property, plant and equipment are stated at cost. Depreciation is provided for as follows: Assets Basis Rate Buildings Straight-line 10 years Computer equipment and software Straight-line 3 years Furniture and fixtures Straight-line 5 years Machinery and equipment Straight-line 5 - 10 years Leasehold improvements Straight-line Shorter of lease term or estimated useful life Depreciation expense on machinery and equipment used in the production and manufacturing process is included in cost of revenue. All other depreciation is included in depreciation and amortization expense in the consolidated statements of operations and comprehensive loss.
Long-term investments	Long-term investments:The Company accounts for investments in which it has significant influence, including variable interest entities ("VIEs") for which the Company is not the primary beneficiary, using the equity method of accounting. Under the equity method, the Company recognizes its share of income from equity accounted investees in the statement of operations with a corresponding increase in long-term investments. Any dividends paid or payable are credited against long-term investments.
Financial liabilities	Financial liabilities: Accounts payable and accrued liabilities, short-term debt, long-term debt and long-term royalty payable are measured at amortized cost. Transaction costs relating to long-term debt are netted against long-term debt and are amortized using the effective interest rate method.
Research and development costs	Research and development costs:Research and development costs are expensed as incurred and are recorded net of funding received or receivable.
Intangible assets	Intangible assets: Intangible assets consist primarily of the estimated value of intellectual property, trademarks, technology, customer contracts and non-compete agreements acquired through acquisitions. Intangible assets are amortized over their estimated useful lives, which range from 5 to 20 years.
Impairment of long-lived assets	Impairment of long-lived assets: The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. If such conditions exist, assets are considered impaired if the sum of the undiscounted expected future cash flows expected to result from the use and eventual disposition of an asset is less than its carrying amount. An impairment loss is measured at the amount by which the carrying amount of the asset exceeds its fair value. When quoted market prices are not available, the Company uses the expected future cash flows discounted at a rate commensurate with the risks associated with the recovery of the asset as an estimate of fair value.
Goodwill	Goodwill:Goodwill is recorded at the time of purchase for the excess of the amount of the purchase price over the fair values of the identifiable assets acquired and liabilities assumed. The fair value is determined using the estimated discounted future cash flows of the reporting unit. Goodwill is not amortized and instead is tested at least annually for impairment, or more frequently when events or changes in circumstances indicate that goodwill might be impaired. This impairment test is performed annually at December 31. Future adverse changes in market conditions or poor operating results of underlying assets could result in an inability to recover the carrying value of the goodwill, thereby possibly requiring an impairment charge.
Warranty liability	Warranty liability:Estimated warranty costs are recognized at the time the Company sells its products and are included in cost of revenue. The Company provides warranty coverage on products sold from the date the products are put into service by customers. Warranty liability represents the Company’s best estimate of warranty costs expected to be incurred during the warranty period.  Furthermore, the current portion of warranty liability represents the Company’s best estimate of the costs to be incurred in the next twelve-month period. The Company uses historical failure rates and costs to repair defective products to estimate the warranty liability. New product launches require a greater use of judgment in developing estimates until claims experience becomes available. Product specific experience is typically available four or five quarters after product launch, with a clear experience trend not evident until eight to twelve quarters after launch. The Company records warranty expense for new products using historical experience from previous generations in the first year, a blend of actual product and historical experience in the second year and product specific experience thereafter. The amount payable by the Company and the timing will depend on actual failure rates and cost to repair failures of its products.
Revenue recognition	Revenue recognition: The Company generates revenues primarily from product sales. Product revenues are derived from standard product sales contracts and from long-term fixed price contracts. The Company recognizes revenue when a customer obtains control of the goods. Determining the timing of the transfer of control, at a point in time or over time, requires judgment. On standard product sales contracts, revenues are recognized when customers obtain control of the product, that is when transfer of title and risks and rewards of ownership of goods have passed and when obligation to pay is considered certain. Invoices are generated and revenue is recognized at that point in time. Provisions for warranties are made at the time of sale. Service revenue is recognized over time as performance obligations are satisfied.
Income taxes	Income taxes: The Company accounts for income taxes using the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based on the temporary differences between the accounting basis and tax basis of the assets and liabilities and for loss carry-forwards, tax credits and other tax attributes, using the enacted tax rates in effect for the years in which the differences are expected to reverse. The effect of a change in tax rates on deferred income tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company recognizes deferred income tax assets to the extent the assets are more-likely-than-not to be realized. In making such a determination, the Company considers all available positive and negative evidence including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies and results of recent operations. If it is determined that, based on all available evidence, it is more-likely-than-not that some or all of the deferred income tax assets will not be realized, a valuation allowance is provided to reduce the deferred income tax assets. 3. Significant accounting policies (continued): (o) Income taxes (continued): The Company uses a two-step process to recognize and measure the income tax benefit of uncertain tax positions taken or expected to be taken in a tax return. The tax benefit from an uncertain tax position is recognized if it is more-likely-than-not that the position will be sustained upon examination by a tax authority based solely on the technical merits of the position. A tax benefit that meets the more-likely-than-not recognition threshold is measured as the largest amount that is greater than 50% likely to be realized upon settlement with the tax authority. To the extent a full benefit is not expected to be realized, an income tax liability is established. Any change in judgment related to the expected resolution of an uncertain tax position is recognized in the year of such a change. Interest and penalties related to income taxes are included as a component of income tax expense.
Leases	Leases: The Company determines if an arrangement is a lease or contains a lease at inception. Operating leases with lease terms greater than 12 months are included in current and non-current assets, current and non-current liabilities in the consolidated balance sheet. Assets under finance leases are included in property, plant and equipment and the related lease liabilities in current and non-current liabilities in the consolidated balance sheets. Operating lease and finance lease right-of-use (“ROU”) assets and operating lease liabilities are recognized based on the present value of the future lease payments over the lease term at the commencement date. As the rate implicit in the lease is not readily determinable for the Company’s operating leases, an incremental borrowing rate is generally used to determine the present value of future lease payments. The incremental borrowing rate for each lease is based on the Company’s estimated borrowing rate over a similar term to that of the lease payments, adjusted for various factors including collateralization, location and currency. The operating lease expenses are recognized on a straight-line basis over the lease term and included in general and administration expenses. Short-term leases, which have an initial term of 12 months or less, are not recorded in the consolidated balance sheets.
Stock-based compensation	Stock-based compensation: The Company measures stock-based awards at fair value on the date of the grant and expense the awards over the requisite service period of employees or consultants. The fair value of stock options is determined using the fair market value at the time of grant. The fair value of restricted stock units (“RSU”s) and Deferred Share Units (“DSU”s) are determined using the share price of the Company at the date of grant. The fair value of performance based restricted stock units (“PRSU”) is determined using the Monte Carlo Simulation Model. Stock-based compensation expense related to stock option awards is recognized over the requisite service period on a graded vesting basis. Forfeitures are accounted for as they occur. Stock-based awards are either equity settled or cash settled. Cash-settled awards are recorded as a liability based on the Company's share price on the date of grant and remeasured at the end of each reporting period over the vesting term. The Company’s estimates may be impacted by certain variables including, but not limited to, stock price volatility, employee stock option exercise behaviors, additional stock option grants, the Company’s performance and related tax impacts.
Earnings (loss) per common share	Earnings (loss) per common share: Basic earnings or loss per share includes no potential dilution and is computed by dividing the earnings or loss attributable to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings or loss per share reflect the potential dilution of securities that could share in the earnings or loss of our Company. Dilutive securities are excluded from the calculation of our diluted weighted average common shares outstanding if their effect would be anti-dilutive based on the treasury stock method or due to a net loss from continuing operations. Common Shares that have not been released under the Company’s stock based plan or are being held in trust for purposes of the Company’s restricted stock unit program have been excluded from the calculation of basic earnings per share.

Significant accounting polici_3

Significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Schedule of Foreign Currency Exchange Rate Translation	For the years presented, the Company used the following exchange rates: Year-end exchange rate as at: Average for the year ended: December 31, 2023 December 31, 2022 December 31, 2023 December 31, 2022 Canadian dollar 1.32 1.35 1.35 1.30 Euro 0.90 0.94 0.92 0.95 RMB 7.10 6.90 7.08 6.72 Polish Zloty 3.92 4.39 4.59 4.44 Swedish Krona 10.04 10.42 10.60 10.08 Indian Rupee 83.18 82.69 82.57 78.50 Argentine Peso 806.72 176.79 285.97 127.11
Schedule of Property Plant and Equipment Components	Property, plant and equipment are stated at cost. Depreciation is provided for as follows: Assets Basis Rate Buildings Straight-line 10 years Computer equipment and software Straight-line 3 years Furniture and fixtures Straight-line 5 years Machinery and equipment Straight-line 5 - 10 years Leasehold improvements Straight-line Shorter of lease term or estimated useful life

Accounts receivable (Tables)

Accounts receivable (Tables)	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
Schedule of Accounts Receivable	December 31, 2023 2022 Customer trade receivables $ 83,175 $ 82,533 Other receivables 6,709 19,355 Income tax receivable 1,369 818 Due from related parties (note 20) 1,671 3,974 Allowance for credit losses (4,847) (5,040) $ 88,077 $ 101,640

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
Schedule of Inventories	December 31, 2023 2022 Purchased parts and materials $ 50,770 $ 61,213 Work-in-progress 2,801 2,423 Finished goods 13,959 17,999 $ 67,530 $ 81,635

Sale of investment (Tables)

Sale of investment (Tables)	12 Months Ended
	Dec. 31, 2023
Discontinued Operations and Disposal Groups [Abstract]
Realized Gain (Loss) on Investments	December 31, 2022 Proceeds from sale of investment $ 31,445 Holdback receivable 1 9,713 Less: carrying value of investment 22,039 Gain on sale of investment $ 19,119 1 Holdback receivable is included in other long-term assets in the consolidated balance sheets.

Long-term investments (Tables)

Long-term investments (Tables)	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of Long-term Investments	December 31, 2023 2022 Weichai Westport Inc. (a) $ 1,411 $ 1,824 Minda Westport Technologies Limited (b) 3,234 2,657 Other equity accounted investees 147 148 $ 4,792 $ 4,629

Property, plant and equipment (

Property, plant and equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Accumulated Net Book December 31, 2023 Cost Depreciation Value Land and buildings $ 9,206 $ 2,635 $ 6,571 Computer equipment and software 9,386 6,773 2,613 Furniture and fixtures 8,326 6,103 2,223 Machinery and equipment 129,642 75,111 54,531 Leasehold improvements 13,221 9,670 3,551 $ 169,781 $ 100,292 $ 69,489 Accumulated Net Book December 31, 2022 Cost Depreciation Value Land and buildings $ 8,455 $ 2,107 $ 6,348 Computer equipment and software 8,756 6,740 2,016 Furniture and fixtures 7,283 5,606 1,677 Machinery and equipment 115,235 66,272 48,963 Leasehold improvements 13,874 10,237 3,637 $ 153,603 $ 90,962 $ 62,641

Intangible assets (Tables)

Intangible assets (Tables)	12 Months Ended
	Dec. 31, 2023
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Schedule of Finite-Lived Intangible Assets	Accumulated Intangible December 31, 2023 Cost Amortization Assets, net Patents and trademarks $ 20,417 $ 13,724 $ 6,693 Technology 4,094 3,965 129 Customer contracts 11,646 11,646 — Total $ 36,157 $ 29,335 $ 6,822 Accumulated Intangible December 31, 2022 Cost Amortization Assets, net Patents and trademarks $ 19,799 $ 12,189 $ 7,610 Technology 3,952 3,745 207 Customer contracts 11,242 11,242 — Total $ 34,993 $ 27,176 $ 7,817

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Changes in the carrying amount of goodwill are as follows: December 31, 2023 2022 Balance, beginning of year $ 2,958 $ 3,121 Impact of foreign exchange changes 108 (163) Balance, end of year $ 3,066 $ 2,958

Other long-term assets (Tables)

Other long-term assets (Tables)	12 Months Ended
	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of other long-term assets	December 31, 2023 2022 Other assets $ 9,083 $ 6,657 Prepaid capital asset deposits — 788 Property lease deposits 310 288 Holdback receivable (note 6) 10,363 10,003 Other investments 609 294 Total $ 20,365 $ 18,030

Accounts payable and accrued _2

Accounts payable and accrued liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Accounts Payable and Accrued Liabilities, Current [Abstract]
Schedule of Accounts Payable and Accrued Liabilities	December 31, 2023 2022 Trade accounts payable $ 70,567 $ 72,934 Accrued payroll 18,129 17,069 Taxes payable 4,302 4,425 Deferred revenue 2,376 4,435 $ 95,374 $ 98,863

Operating leases right-of-use_2

Operating leases right-of-use assets and lease liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Schedule of Lease Cost	The components of lease cost are as follows: Years ended December 31, 2023 2022 Amortization of right-of-use assets $ 3,041 $ 3,529 Interest 666 717 Total lease cost $ 3,707 $ 4,246
Schedule of Maturities of Lease Liabilities	The maturities of lease liabilities as of December 31, 2023 are as follows: 2024 $ 3,307 2025 2,836 2026 2,586 2027 2,512 2028 2,241 Thereafter 12,433 Total undiscounted cash flows 25,915 Less: imputed interest 3,308 Present value of operating lease liabilities 22,607 Less: current portion 3,307 Long-term operating lease liabilities $ 19,300

Short-term debt (Tables)

Short-term debt (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Short-term Debt	December 31, 2023 2022 Revolving financing facilities $ 15,156 $ 9,102

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	December 31, 2023 2022 Term loan facilities, net of debt issuance costs (a) $ 42,879 $ 41,934 Other bank financing (b) 531 512 Capital lease obligations (c) 1,655 1,416 Balance, end of year 45,065 43,862 Less: current portion 14,108 11,698 Long-term portion $ 30,957 $ 32,164
Schedule of Maturities of Long-term Debt	The principal repayment schedule of long-term debt is as follows as at December 31, 2023: Term loan facilities Other bank financing Capital lease obligations Total 2024 $ 13,396 $ 133 $ 579 $ 14,108 2025 13,670 133 405 14,208 2026 9,733 133 194 10,060 2027 2,793 132 182 3,107 2028 and thereafter 3,287 — 295 3,582 $ 42,879 $ 531 $ 1,655 $ 45,065

Long-term royalty payable (Tabl

Long-term royalty payable (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Long-term Royalty Payable	December 31, 2023 2022 Balance, beginning of year $ 5,538 $ 9,947 Accretion expense 240 791 Repayment (8,687) (5,200) Loss on extinguishment 2,909 — Balance, end of year — 5,538 Less: current portion — 1,162 Long-term portion $ — $ 4,376

Warranty liability (Tables)

Warranty liability (Tables)	12 Months Ended
	Dec. 31, 2023
Product Warranties Disclosures [Abstract]
Schedule of Product Warranty Liability	A continuity of the warranty liability is as follows: Years ended December 31, 2023 2022 Balance, beginning of year $ 14,299 $ 18,791 Warranty claims (6,826) (11,081) Warranty accruals 5,152 4,338 Change in estimate (2,204) 3,559 Impact of foreign exchange changes (1,915) (1,308) Balance, end of year 8,506 14,299 Less: current portion 6,892 11,315 Long-term portion $ 1,614 $ 2,984

Share capital, stock options _2

Share capital, stock options and other stock-based plans (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	A continuity of the Units issued under the Westport Omnibus Plan are as follows: December 31 December 31 2023 2022 Number of Weighted Number of Weighted Outstanding, beginning of year 317,432 $ 24.15 186,643 $ 29.80 Granted 435,128 13.78 254,109 18.32 Vested and exercised (44,186) 38.76 (50,384) 31.94 Forfeited/expired (229,731) 19.26 (72,936) 12.77 Outstanding, end of year 478,643 $ 15.68 317,432 $ 24.15 Units outstanding and exercisable, end of year — — — —
Schedule of Share Based Compensation Arrangement by Share Based Payment Award Intrinsic Value	The aggregate intrinsic value of the Company’s share units are as follows: December 31, 2023 2022 CDN$ CDN$ Share units: Outstanding $ 3,283 $ 3,310 Exercisable — — Exercised 386 524
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	Stock-based compensation associated with the Unit plans is included in operating expenses as follows: Years ended December 31, 2023 2022 Cost of revenue $ 26 $ 184 Research and development 570 336 General and administrative 1,806 1,638 Sales and marketing 228 232 $ 2,630 $ 2,390

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The Company’s income tax provision differs from that calculated by applying the combined enacted Canadian federal and provincial statutory income tax rate of 27% for the year ended December 31, 2023 (year ended December 31, 2022 – 27%) as follows: Years ended December 31, 2023 2022 Expected income tax expense (recovery) $ (13,153) $ (8,446) Non-deductible stock-based compensation 301 233 Other permanent differences 86 5 Withholding taxes and other foreign taxes 709 621 Change in enacted tax rates 221 294 Foreign tax rate differences, foreign exchange and other adjustments 103 392 Change in valuation allowance 9,505 (3,249) Expired losses 1,445 11,562 Foreign-derived income inclusion 1,785 — Income tax expense (recovery) $ 1,002 $ 1,412
Schedule of Deferred Tax Assets and Liabilities	The significant components of the deferred income tax assets and liabilities are as follows: December 31, 2023 2022 Deferred income tax assets: Net loss carry forwards $ 225,659 $ 208,399 Intangible assets 3,854 4,015 Property, plant and equipment 20,292 18,392 Warranty liability 2,017 3,631 Foreign tax credits 620 620 Inventory 3,271 1,933 Research and development 5,074 5,001 Tax realignment due to Italian tax law changes 9,353 7,713 Financing and share issuance cost 767 1,106 Other 9,224 8,859 Total gross deferred income tax assets 280,131 259,669 Valuation allowance (268,577) (249,239) Total deferred income tax assets $ 11,554 $ 10,430 Deferred income tax liabilities: Intangible assets $ (430) $ (430) Property, plant and equipment (306) (15) Other (2,741) (2,837) Total deferred income tax liabilities $ (3,477) $ (3,282) Total net deferred income tax assets $ 8,077 $ 7,148
Schedule of Components of Income Tax Expense (Benefit)	The components of the Company’s income tax expense (recovery) are as follows: Income tax expense (recovery) Net income (loss) before income taxes Current Deferred Total Year ended December 31, 2023 Italy $ 4,531 $ 84 $ (828) $ (744) United States (4,088) 14 — 14 Canada (40,934) 590 — 590 Netherlands 3,391 744 (25) 719 Poland 2,228 253 69 322 Other (13,844) 101 — 101 $ (48,716) $ 1,786 $ (784) $ 1,002 Year ended December 31, 2022 Italy $ 1,023 $ 20 $ (511) $ (491) United States 15,136 6 — 6 Canada (46,657) 372 — 372 Netherlands 3,103 601 (25) 576 Poland 3,002 512 118 630 Other (6,890) 341 (22) 319 $ (31,283) $ 1,852 $ (440) $ 1,412
Summary of Operating Loss Carryforwards	The Company has loss carry-forwards in various tax jurisdictions available to offset future taxable income that expire in the following years, as follows: 2024 2025 2026 2027 and later Total Canada $ — $ — $ — $ 660,110 $ 660,110 Italy — — — 15,670 15,670 United States — — — 72,311 72,311 Sweden — — — 10,976 10,976 China 921 2,203 — 3,295 6,419 India — — — 5,354 5,354 Australia and Other — — 205 7,463 7,668 Total $ 921 $ 2,203 $ 205 $ 775,179 $ 778,508

Segment information (Tables)

Segment information (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of Segment Reporting Information	Financial information by business segment as follows: Year ended December 31, 2023 Revenue Operating income (loss) Depreciation & amortization Equity income OEM $ 222,741 $ (31,222) $ 9,471 $ 780 IAM 109,058 2,583 2,479 — Corporate — (17,244) 540 — Total consolidated $ 331,799 $ (45,883) $ 12,490 $ 780 Year ended December 31, 2022 Revenue Operating income (loss) Depreciation & amortization Equity income OEM $ 198,036 $ (32,000) $ 8,205 $ 930 IAM 107,662 2,340 3,162 — Corporate — (20,606) 433 — Total consolidated $ 305,698 $ (50,266) $ 11,800 $ 930 Years ended December 31, 2023 2022 Total additions to long-lived assets, excluding business combinations: OEM $ 13,285 $ 11,178 IAM 1,613 2,754 Corporate 676 597 Total consolidated $ 15,574 $ 14,529
Schedule of Geographical Revenue Information	Revenues are attributable to geographical regions based on the location of the Company’s customers and are presented as a percentage of the Company's revenues, as follows: % of total revenue Years ended December 31, 2023 2022 Europe 70 % 64 % Americas 13 % 12 % Asia 10 % 15 % Africa 3 % 5 % Other 4 % 4 %
Schedule of Allocation of the Total Assets	Total assets are allocated as follows : Total assets by operating segment Years ended December 31, 2023 2022 OEM $ 201,348 $ 241,795 IAM 145,640 145,377 Corporate 8,760 20,279 Total consolidated assets $ 355,748 $ 407,451
Schedule of Assets by Segment	Long-lived assets information by geographic area: December 31, 2023 Property, plant and equipment Intangible assets and goodwill Total Italy $ 25,883 $ 6,705 $ 32,588 Canada 24,098 117 24,215 Rest of Europe 11,042 3,066 14,108 Asia Pacific 8,466 — 8,466 Total consolidated long-lived assets 69,489 9,888 79,377 December 31, 2022 Property, plant and equipment Intangible assets and goodwill Total Italy $ 20,382 $ 7,688 $ 28,070 Canada 25,199 129 25,328 Rest of Europe 9,032 2,958 11,990 Asia Pacific 8,028 — 8,028 Total consolidated long-lived assets $ 62,641 $ 10,775 $ 73,416

Financial instruments (Tables)

Financial instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Financial Instruments Disclosure [Abstract]
Contractual Obligation, Fiscal Year Maturity Schedule	The following are the contractual maturities of financial obligations as at December 31, 2023: Carrying Contractual < 1 year 1-3 years 4-5 years >5 years Accounts payable and accrued liabilities $ 95,374 $ 95,374 $ 95,374 $ — $ — $ — Short-term debt (note 14) 15,156 15,156 15,156 — — — Term loan facilities (note 15(a)) 42,879 47,689 15,873 25,538 5,212 1,066 Other bank financing (note 15(b)) 531 538 139 133 133 133 Capital lease obligations (note 15(c)) 1,655 1,670 596 598 182 294 Operating lease commitments (note 13) 22,607 25,915 3,307 5,422 4,753 12,433 $ 178,202 $ 186,342 $ 130,445 $ 31,691 $ 10,280 $ 13,926

Liquidity and Going Concern (De

Liquidity and Going Concern (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2021
Debt Instrument [Line Items]
Cash and cash equivalents	$ 54,853	$ 86,184			$ 124,892
Net cash used in operating activities	(13,193)	(34,615)
Operating income (loss)	(45,883)	(50,266)
Net working capital	9,413
Debt	59,944
Debt maturing within one year	29,264
Debt and capital lease obligations	45,065	43,862
Secured Debt
Debt Instrument [Line Items]
Debt and capital lease obligations	42,879	41,934
Secured Debt | EDC Loan
Debt Instrument [Line Items]
Minimum cash requirement			$ 15,000	$ 40,000
Debt and capital lease obligations	$ 10,763	$ 14,683

Significant accounting polici_4

Significant accounting policies - Exchange Rates (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Canadian dollar
Schedule of Foreign Currency [Line Items]
Foreign current exchange rate at year end	1.32	1.35
Average foreign currency exchange rate	1.35	1.30
Euro
Schedule of Foreign Currency [Line Items]
Foreign current exchange rate at year end	0.90	0.94
Average foreign currency exchange rate	0.92	0.95
RMB
Schedule of Foreign Currency [Line Items]
Foreign current exchange rate at year end	7.10	6.90
Average foreign currency exchange rate	7.08	6.72
Polish Zloty
Schedule of Foreign Currency [Line Items]
Foreign current exchange rate at year end	3.92	4.39
Average foreign currency exchange rate	4.59	4.44
Swedish Krona
Schedule of Foreign Currency [Line Items]
Foreign current exchange rate at year end	10.04	10.42
Average foreign currency exchange rate	10.60	10.08
Indian Rupee
Schedule of Foreign Currency [Line Items]
Foreign current exchange rate at year end	83.18	82.69
Average foreign currency exchange rate	82.57	78.50
Argentine Peso
Schedule of Foreign Currency [Line Items]
Foreign current exchange rate at year end	806.72	176.79
Average foreign currency exchange rate	285.97	127.11

Significant accounting polici_5

Significant accounting policies - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Restricted cash	$ 103	$ 98

Significant accounting polici_6

Significant accounting policies - Property, Plant and Equipment (Details)	Dec. 31, 2023
Buildings
Property, Plant and Equipment [Line Items]
Useful life (in years)	10 years
Computer equipment and software
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	10 years

Significant accounting polici_7

Significant accounting policies - Narrative (Details)	Dec. 31, 2023
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	5 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	20 years

Accounts receivable (Details)

Accounts receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Customer trade receivables	$ 83,175	$ 82,533
Other receivables	6,709	19,355
Income tax receivable	1,369	818
Allowance for credit losses	(4,847)	(5,040)
Accounts receivable, net	88,077	101,640
Related Party
Related Party Transaction [Line Items]
Due from related parties (note 20)	$ 1,671	$ 3,974

Inventories - Schedule of Inven

Inventories - Schedule of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Purchased parts and materials	$ 50,770	$ 61,213
Work-in-progress	2,801	2,423
Finished goods	13,959	17,999
Inventory Net	$ 67,530	$ 81,635

Inventories - Narrative (Detail

Inventories - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Inventory write-downs to net realizable value	$ 7,066	$ 722
Inventory write down due to contract	4,461	542
Inventory write-downs, purchased parts and materials inventory and finished goods	$ 2,605	$ 180

Sale of investment - Narrative

Sale of investment - Narrative (Details) - Cummins Westport, Inc. - USD ($) $ in Thousands		12 Months Ended
	Feb. 07, 2022	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of investment	$ 22,200	$ 31,445
Proceeds from sale of intellectual property	20,000
Proceeds received net of holdback	31,445
Purchase agreement holdback	$ 10,800
Purchase agreement holdback term	3 years

Sale of investment - Gain on Sa

Sale of investment - Gain on Sale of Investment (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 07, 2022	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of investment		$ 0	$ 19,119
Cummins Westport, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of investment	$ 22,200		31,445
Holdback receivable			9,713
Less: carrying value of investment			22,039
Gain on sale of investment			$ 19,119

Long-term investments - Schedul

Long-term investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Long-term investments (note 7)	$ 4,792	$ 4,629
Weichai Westport Inc. (a)
Schedule of Investments [Line Items]
Long-term investments (note 7)	1,411	1,824
Minda Westport Technologies Limited (b)
Schedule of Investments [Line Items]
Long-term investments (note 7)	3,234	2,657
Other equity accounted investees
Schedule of Investments [Line Items]
Long-term investments (note 7)	$ 147	$ 148

Long-term investments - Narrati

Long-term investments - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Apr. 30, 2016	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Impairment of long-term investment				$ (413)	$ 0
Minda Westport Technologies Limited
Schedule of Investments [Line Items]
Equity method investment, ownership percentage	50%			50%
Sale of Stock, Percentage of Ownership Sold in Transaction		26%
Cartesian Capital Group | Weichai Westport Inc. (a)
Schedule of Investments [Line Items]
Percentage of ownership after transaction			18.78%
Subsidiaries | Westport HK | Weichai Westport Inc. (a)
Schedule of Investments [Line Items]
Percentage of ownership after transaction				23.33%
Parent Company | Westport HK | Weichai Westport Inc. (a)
Schedule of Investments [Line Items]
Percentage of ownership after transaction	4.55%			4.55%

Property, plant and equipment -

Property, plant and equipment - Schedule of PPE (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Cost	$ 169,781	$ 153,603
Accumulated Depreciation	100,292	90,962
Property, plant and equipment	69,489	62,641
Land and buildings
Property, Plant and Equipment [Line Items]
Cost	9,206	8,455
Accumulated Depreciation	2,635	2,107
Property, plant and equipment	6,571	6,348
Computer equipment and software
Property, Plant and Equipment [Line Items]
Cost	9,386	8,756
Accumulated Depreciation	6,773	6,740
Property, plant and equipment	2,613	2,016
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Cost	8,326	7,283
Accumulated Depreciation	6,103	5,606
Property, plant and equipment	2,223	1,677
Machinery and equipment
Property, Plant and Equipment [Line Items]
Cost	129,642	115,235
Accumulated Depreciation	75,111	66,272
Property, plant and equipment	54,531	48,963
Leasehold improvements
Property, Plant and Equipment [Line Items]
Cost	13,221	13,874
Accumulated Depreciation	9,670	10,237
Property, plant and equipment	$ 3,551	$ 3,637

Property, plant and equipment_2

Property, plant and equipment - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Depreciation	$ 11,586	$ 10,712
Depreciation in cost of sales	$ 8,191	$ 7,384

Intangible assets - Finite-live

Intangible assets - Finite-lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Cost	$ 36,157	$ 34,993
Accumulated amortization	29,335	27,176
Net book value	6,822	7,817
Patents and trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	20,417	19,799
Accumulated amortization	13,724	12,189
Net book value	6,693	7,610
Technology
Finite-Lived Intangible Assets [Line Items]
Cost	4,094	3,952
Accumulated amortization	3,965	3,745
Net book value	129	207
Customer contracts
Finite-Lived Intangible Assets [Line Items]
Cost	11,646	11,242
Accumulated amortization	11,646	11,242
Net book value	$ 0	$ 0

Intangible assets - Narrative (

Intangible assets - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization of intangible assets	$ 904	$ 1,088
Amortization 2023	1,241
Amortization 2024	1,198
Amortization 2025	958
Amortization 2026	809
Amortization 2027	$ 2,627

Goodwill - Schedule of Goodwill

Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Balance, beginning of year	$ 2,958	$ 3,121
Impact of foreign exchange changes	108	(163)
Balance, end of year	$ 3,066	$ 2,958

Goodwill - Narrative (Details)

Goodwill - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 3,066	$ 2,958	$ 3,121

Other long-term assets (Details

Other long-term assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other assets	$ 9,083	$ 6,657
Prepaid capital asset deposits	0	788
Property lease deposits	310	288
Holdback receivable (note 6)	10,363	10,003
Other investments	609	294
Total	$ 20,365	$ 18,030

Accounts payable and accrued _3

Accounts payable and accrued liabilities - Schedule of AP and Accrued Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounts Payable and Accrued Liabilities, Current [Abstract]
Trade accounts payable	$ 70,567	$ 72,934
Accrued payroll	18,129	17,069
Taxes payable	4,302	4,425
Deferred revenue	2,376	4,435
Total accounts payable and accrued liabilities	95,374	98,863
Deferred revenue recognized	$ 2,062	$ 2,531

Operating leases right-of-use_3

Operating leases right-of-use assets and lease liabilities - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Remaining lease term	6 years
Weighted average discount rate	3%
Right-of-use assets exchanged for operating lease liabilities	$ 1,657	$ 699

Operating leases right-of-use_4

Operating leases right-of-use assets and lease liabilities - Components of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Amortization of right-of-use assets	$ 3,041	$ 3,529
Interest	666	717
Total lease cost	$ 3,707	$ 4,246

Operating leases right-of-use_5

Operating leases right-of-use assets and lease liabilities - Maturity of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
2024	$ 3,307
2025	2,836
2026	2,586
2027	2,512
2028	2,241
Thereafter	12,433
Total undiscounted cash flows	25,915
Less: imputed interest	3,308
Present value of operating lease liabilities	22,607
Less: current portion	3,307	$ 3,379
Long-term operating lease liabilities	$ 19,300	$ 20,080

Short-term debt (Details)

Short-term debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Revolving financing facilities	$ 15,156,000	$ 9,102,000
Senior financing
Short-term Debt [Line Items]
Revolving financing facilities	15,156,000	9,102,000
HSBC Revolving Financing Facility | Senior financing
Short-term Debt [Line Items]
Maximum draw amount	20,000,000
Amount outstanding	$ 15,156,000	8,308,000
HSBC Revolving Financing Facility | Senior financing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Basis spread on variable rate debt	3.76%
HSBC Revolving Financing Facility | Senior financing | Eurodollar
Short-term Debt [Line Items]
Basis spread on variable rate debt	3.60%
Santander Revolving Financing Facility | Senior financing
Short-term Debt [Line Items]
Amount outstanding		794,000
ING Revolving Financing Facility | Senior financing
Short-term Debt [Line Items]
Maximum draw amount	$ 1,530,000
Amount outstanding	$ 0	$ 0
ING Revolving Financing Facility | Senior financing | Warsaw Interbank Offered Rate
Short-term Debt [Line Items]
Basis spread on variable rate debt	1.20%

Long-term debt - Schedule of De

Long-term debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total Gross Debt	$ 45,065	$ 43,862
Less: current portion	14,108	11,698
Long-term portion	30,957	32,164
Other bank financing
Debt Instrument [Line Items]
Total Gross Debt	531	512
Capital lease obligations
Debt Instrument [Line Items]
Total Gross Debt	1,655	1,416
Term loan facilities
Debt Instrument [Line Items]
Total Gross Debt	$ 42,879	$ 41,934

Long-term debt - Narrative (Det

Long-term debt - Narrative (Details) - USD ($)					12 Months Ended
	Dec. 04, 2023	Nov. 29, 2023	Nov. 28, 2023	Dec. 13, 2021	Dec. 31, 2023	Dec. 31, 2022	Apr. 29, 2021	Aug. 11, 2020	Jul. 17, 2020	May 20, 2020
Debt Instrument [Line Items]
Debt and capital lease obligations					$ 45,065,000	$ 43,862,000
Interest Rate Swap
Debt Instrument [Line Items]
Fair value					822,000	1,612,000
Unicredit Interest Rate Swap
Debt Instrument [Line Items]
Nominal amount					16,731,000
Deutsche Bank Interest Rate Swap
Debt Instrument [Line Items]
Nominal amount					$ 3,871,000
Capital lease obligations | Minimum
Debt Instrument [Line Items]
Effective rate on debt					1.70%
Term					2 years
Capital lease obligations | Maximum
Debt Instrument [Line Items]
Effective rate on debt					2.70%
Term					5 years
Secured Debt
Debt Instrument [Line Items]
Debt and capital lease obligations					$ 42,879,000	41,934,000
Secured Debt | EDC Loan
Debt Instrument [Line Items]
Long-term debt				$ 20,000,000
Debt issuance costs				$ 300,000
Debt and capital lease obligations					10,763,000	14,683,000
Secured Debt | EDC Loan | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate debt				2.01%
Secured Debt | UniCredit Loan
Debt Instrument [Line Items]
Debt and capital lease obligations					6,793,000	8,044,000	$ 8,803,000
Effective rate on debt							1.65%
Secured Debt | Third UniCredit Loan
Debt Instrument [Line Items]
Debt and capital lease obligations					1,693,000	2,699,000
Effective rate on debt										1.70%
Secured Debt | Fourth UniCredit Loan
Debt Instrument [Line Items]
Debt and capital lease obligations					8,313,000	11,273,000
Effective rate on debt									1.75%
Secured Debt | 1.70% Deutsche Bank Euro Loan
Debt Instrument [Line Items]
Debt and capital lease obligations					3,867,000	5,235,000
Effective rate on debt								1.70%
Secured Debt | Banca de Credito Cooperativo Loan Agreement | Euribor
Debt Instrument [Line Items]
Basis spread on variable rate debt			1.75%
Debt and capital lease obligations					2,192,000	0
Secured Debt | 1.90% Deutsche Bank Euro Loan | Euribor
Debt Instrument [Line Items]
Basis spread on variable rate debt		1.90%
Debt and capital lease obligations					7,710,000	0
Secured Debt | Rabobank Loan Agreement | Euribor
Debt Instrument [Line Items]
Basis spread on variable rate debt	4.70%
Debt and capital lease obligations					$ 1,548,000	$ 0
Convertible debt | Other bank financing
Debt Instrument [Line Items]
Effective rate on debt					0.55%

Long-term debt - Schedule of Ma

Long-term debt - Schedule of Maturities on Senior Financing (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
2024	$ 14,108
2025	14,208
2026	10,060
2027	3,107
2028 and thereafter	3,582
Long-term debt	45,065
Capital lease obligations
Debt Instrument [Line Items]
2024	579
2025	405
2026	194
2027	182
2028 and thereafter	295
Long-term debt	1,655
Other bank financing
Debt Instrument [Line Items]
2024	133
2025	133
2026	133
2027	132
2028 and thereafter	0
Long-term debt	531
Term loan facilities
Debt Instrument [Line Items]
2024	13,396
2025	13,670
2026	9,733
2027	2,793
2028 and thereafter	3,287
Long-term debt	$ 42,879

Long-term royalty payable - Con

Long-term royalty payable - Continuity Schedule of Long-term Royalty Payable (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 03, 2023	Dec. 31, 2023	Dec. 31, 2022
Long-Term Debt [Roll Forward]
Loss on extinguishment		$ 2,909	$ 0
Less: current portion		0	1,162
Long-term portion		0	4,376
Royalty agreement
Long-Term Debt [Roll Forward]
Balance, beginning of year		5,538	9,947
Accretion expense		240	791
Repayment	$ (8,687)	(8,687)	(5,200)
Loss on extinguishment		2,909	0
Balance, end of year		0	5,538
Royalty payable		0	5,538
Less: current portion		0	1,162
Long-term portion		$ 0	$ 4,376

Warranty liability - Continuity

Warranty liability - Continuity of Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance, beginning of year	$ 14,299	$ 18,791
Warranty claims	(6,826)	(11,081)
Warranty accruals	5,152	4,338
Change in estimate	(2,204)	3,559
Impact of foreign exchange changes	(1,915)	(1,308)
Balance, end of year	8,506	14,299
Warranty liability	8,506	14,299
Less: current portion	6,892	11,315
Long-term portion	$ 1,614	$ 2,984

Warranty liability - Narrative

Warranty liability - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023
Other receivables
Product Warranty Liability [Line Items]
Insurance recovery	$ 2,937
Warranty accrual related to field service campaign		$ 984
Other long-term asset
Product Warranty Liability [Line Items]
Insurance recovery	$ 4,122
Warranty accrual related to field service campaign		$ 605

Share capital, stock options _3

Share capital, stock options and other stock-based plans - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio	0.1
Compensation expense | $	$ 2,630	$ 2,390
Stock-based compensation settled in shares | $	1,727	2,066
Stock-based compensation settled in cash | $	903	324
Share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $	$ 1,727	$ 2,066
Granted (in shares) | shares	435,128	254,109
Compensation cost not yet recognized | $	$ 2,054
Compensation cost not yet recognized, period for recognition (in years)	2 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	147,557	99,470
Vesting period (in years)	3 years
PSU's
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	185,365	122,139
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	102,206	32,500
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common shares on exercise of share units (in shares) | shares	44,186	50,384

Share capital, stock options _4

Share capital, stock options and other stock-based plans - Share units (Details) - Share units - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Number of Units
Outstanding, beginning of period (in shares)	317,432	186,643
Granted (in shares)	435,128	254,109
Vested and exercised (in shares)	(44,186)	(50,384)
Forfeited/expired (in shares)	(229,731)	(72,936)
Outstanding, end of period (in shares)	478,643	317,432
Units outstanding and exercisable, end of period (in shares)	0	0
Weighted average grant date fair value (CDN $)
Outstanding, beginning of period (in Canadian dollars per share)	$ 24.15	$ 29.80
Granted (in Canadian dollars per share)	13.78	18.32
Vested and exercised (in Canadian dollars per share)	38.76	31.94
Forfeited/expired (in Canadian dollars per share)	19.26	12.77
Outstanding, end of period (in Canadian dollars per share)	15.68	24.15
Units outstanding and exercisable, end of period (in Canadian dollars per share)	$ 0	$ 0

Share capital, stock options _5

Share capital, stock options and other stock-based plans - Aggregate intrinsic values (Details) - Share units - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding	$ 3,283	$ 3,310
Exercisable	0	0
Exercised	$ 386	$ 524

Share capital, stock options _6

Share capital, stock options and other stock-based plans - Stock-based compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense	$ 2,630	$ 2,390
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense	26	184
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense	570	336
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense	1,806	1,638
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation expense	$ 228	$ 232

Income taxes - Narrative (Detai

Income taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Effective federal rate	27%	27%
Unrecognized tax benefit	$ 5,552	$ 5,352

Income taxes - Effective Income

Income taxes - Effective Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Expected income tax expense (recovery)	$ (13,153)	$ (8,446)
Non-deductible stock-based compensation	301	233
Other permanent differences	86	5
Withholding taxes and other foreign taxes	709	621
Change in enacted tax rates	221	294
Foreign tax rate differences, foreign exchange and other adjustments	103	392
Change in valuation allowance	9,505	(3,249)
Expired losses	1,445	11,562
Foreign-derived income inclusion	1,785	0
Income tax expense (recovery)	$ 1,002	$ 1,412

Income taxes - Deferred Tax Ass

Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred income tax assets:
Net loss carry forwards	$ 225,659	$ 208,399
Intangible assets	3,854	4,015
Property, plant and equipment	20,292	18,392
Warranty liability	2,017	3,631
Foreign tax credits	620	620
Inventory	3,271	1,933
Research and development	5,074	5,001
Tax realignment due to Italian tax law changes	9,353	7,713
Financing and share issuance cost	767	1,106
Other	9,224	8,859
Total gross deferred income tax assets	280,131	259,669
Valuation allowance	(268,577)	(249,239)
Total deferred income tax assets	11,554	10,430
Deferred income tax liabilities:
Intangible assets	(430)	(430)
Property, plant and equipment	(306)	(15)
Other	(2,741)	(2,837)
Total deferred income tax liabilities	(3,477)	(3,282)
Total net deferred income tax assets	$ 8,077	$ 7,148

Income taxes - Components of Ta

Income taxes - Components of Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Income (loss) before income taxes	$ (48,716)	$ (31,283)
Current	1,786	1,852
Deferred	(784)	(440)
Income tax expense (recovery)	1,002	1,412
Italy
Income Taxes [Line Items]
Income (loss) before income taxes	4,531	1,023
Current	84	20
Deferred	(828)	(511)
Income tax expense (recovery)	(744)	(491)
United States
Income Taxes [Line Items]
Income (loss) before income taxes	(4,088)	15,136
Current	14	6
Deferred	0	0
Income tax expense (recovery)	14	6
Canada
Income Taxes [Line Items]
Income (loss) before income taxes	(40,934)	(46,657)
Current	590	372
Deferred	0	0
Income tax expense (recovery)	590	372
Netherlands
Income Taxes [Line Items]
Income (loss) before income taxes	3,391	3,103
Current	744	601
Deferred	(25)	(25)
Income tax expense (recovery)	719	576
Poland
Income Taxes [Line Items]
Income (loss) before income taxes	2,228	3,002
Current	253	512
Deferred	69	118
Income tax expense (recovery)	322	630
Other
Income Taxes [Line Items]
Income (loss) before income taxes	(13,844)	(6,890)
Current	101	341
Deferred	0	(22)
Income tax expense (recovery)	$ 101	$ 319

Income taxes - Expiration of Lo

Income taxes - Expiration of Loss Carry-forwards (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 778,508
2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	921
2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	2,203
2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	205
2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	775,179
Canada
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	660,110
Canada | 2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Canada | 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Canada | 2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Canada | 2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	660,110
Italy
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	15,670
Italy | 2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Italy | 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Italy | 2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Italy | 2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	15,670
United States
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	72,311
United States | 2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
United States | 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
United States | 2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
United States | 2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	72,311
Sweden
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	10,976
Sweden | 2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Sweden | 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Sweden | 2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Sweden | 2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	10,976
China
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	6,419
China | 2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	921
China | 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	2,203
China | 2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
China | 2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	3,295
India
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	5,354
India | 2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
India | 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
India | 2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
India | 2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	5,354
Australia and Other
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	7,668
Australia and Other | 2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Australia and Other | 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Australia and Other | 2026
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	205
Australia and Other | 2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 7,463

Related party transactions (Det

Related party transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Accounts receivable	$ 88,077	$ 101,640
Revenue	331,799	305,698
Related Party | Minda Westport Technologies Limited
Related Party Transaction [Line Items]
Accounts receivable	1,671	3,974
Revenue	$ 7,200	$ 10,473

Segment information - Narrative

Segment information - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	3
Revenue	$ 331,799	$ 305,698
Goodwill	3,066	2,958	$ 3,121
Long-term investments	4,792	4,629
Corporate
Segment Reporting Information [Line Items]
Revenue	0	0
Long-term investments	1,558	1,972
OEM | Operating Segments
Segment Reporting Information [Line Items]
Revenue	222,741	198,036
Long-term investments	3,234	2,657
OEM | Operating Segments | OEM Launch Partner
Segment Reporting Information [Line Items]
Revenue	$ 53,671	$ 43,265
OEM | Revenue from Contract with Customer, Segment Benchmark | Product Concentration Risk | OEM Launch Partner
Segment Reporting Information [Line Items]
Concentration percentage	16%	14%
IAM | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 109,058	$ 107,662
Goodwill	$ 3,066	$ 2,958

Segment information - Financial

Segment information - Financial information by business segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 331,799	$ 305,698
Operating income (loss)	(45,883)	(50,266)
Depreciation & amortization	12,490	11,800
Equity income	780	930
Corporate
Segment Reporting Information [Line Items]
Revenue	0	0
Operating income (loss)	(17,244)	(20,606)
Depreciation & amortization	540	433
Equity income	0	0
OEM | Operating Segments
Segment Reporting Information [Line Items]
Revenue	222,741	198,036
Operating income (loss)	(31,222)	(32,000)
Depreciation & amortization	9,471	8,205
Equity income	780	930
IAM | Operating Segments
Segment Reporting Information [Line Items]
Revenue	109,058	107,662
Operating income (loss)	2,583	2,340
Depreciation & amortization	2,479	3,162
Equity income	$ 0	$ 0

Segment information - Assets (D

Segment information - Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total additions to long-lived assets, excluding business combinations:	$ 15,574	$ 14,529
Operating Segments | OEM
Segment Reporting Information [Line Items]
Total additions to long-lived assets, excluding business combinations:	13,285	11,178
Operating Segments | IAM
Segment Reporting Information [Line Items]
Total additions to long-lived assets, excluding business combinations:	1,613	2,754
Corporate
Segment Reporting Information [Line Items]
Total additions to long-lived assets, excluding business combinations:	$ 676	$ 597

Segment information - Percent o

Segment information - Percent of revenue by geographical location (Details) - Geographic Concentration Risk - Revenue, Product and Service Benchmark	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Europe
Segment Reporting Information [Line Items]
Concentration percentage	70%	64%
Americas
Segment Reporting Information [Line Items]
Concentration percentage	13%	12%
Asia
Segment Reporting Information [Line Items]
Concentration percentage	10%	15%
Africa
Segment Reporting Information [Line Items]
Concentration percentage	3%	5%
Other
Segment Reporting Information [Line Items]
Concentration percentage	4%	4%

Segment Information - Total ass

Segment Information - Total asset allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	$ 355,748	$ 407,451
Operating Segments | OEM
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	201,348	241,795
Operating Segments | IAM
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	145,640	145,377
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total consolidated assets	$ 8,760	$ 20,279

Segment information - Assets by

Segment information - Assets by geographic area (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Total consolidated property, plant and equipment	$ 69,489	$ 62,641
Total consolidated intangible assets	9,888	10,775
Total consolidated long-lived assets	79,377	73,416
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	25,883	20,382
Intangible assets and goodwill	6,705	7,688
Long-lived assets including equity method investments	32,588	28,070
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	24,098	25,199
Intangible assets and goodwill	117	129
Long-lived assets including equity method investments	24,215	25,328
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	11,042	9,032
Intangible assets and goodwill	3,066	2,958
Long-lived assets including equity method investments	14,108	11,990
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	8,466	8,028
Intangible assets and goodwill	0	0
Long-lived assets including equity method investments	$ 8,466	$ 8,028

Financial instruments - Narrati

Financial instruments - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Cash, cash equivalents and short-term investments	$ 54,853
Restricted cash	103	$ 98
Impact on income from 5% change in U.S. dollar against foreign currency	100
Impact on net loss from a 50 basis point change in interest rates	$ 716
Accounts receivable | Customer receivable | Credit concentration risk
Other Commitments [Line Items]
Percent of A/R	88%	76%
Accounts receivable | Government grants receivable | Credit concentration risk
Other Commitments [Line Items]
Percent of A/R	12%	24%
Minimum
Other Commitments [Line Items]
A/R period	30 days
Maximum
Other Commitments [Line Items]
A/R period	90 days

Financial instruments - Financi

Financial instruments - Financial Obligations (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Other Commitments [Line Items]
Carrying amount	$ 178,202
Contractual cash flows	186,342
Contractual obligation, due less than 1 year	130,445
Contractual obligation, due 1-3 years	31,691
Contractual obligation, due 4-5 years	10,280
Contractual obligation, due after 5 years	13,926
Term loan facilities
Other Commitments [Line Items]
Carrying amount	42,879
Contractual cash flows	47,689
Contractual obligation, due less than 1 year	15,873
Contractual obligation, due 1-3 years	25,538
Contractual obligation, due 4-5 years	5,212
Contractual obligation, due after 5 years	1,066
Other bank financing (note 15(b))
Other Commitments [Line Items]
Carrying amount	531
Contractual cash flows	538
Contractual obligation, due less than 1 year	139
Contractual obligation, due 1-3 years	133
Contractual obligation, due 4-5 years	133
Contractual obligation, due after 5 years	133
Capital lease obligations
Other Commitments [Line Items]
Carrying amount	1,655
Contractual cash flows	1,670
Contractual obligation, due less than 1 year	596
Contractual obligation, due 1-3 years	598
Contractual obligation, due 4-5 years	182
Contractual obligation, due after 5 years	294
Operating lease commitments
Other Commitments [Line Items]
Carrying amount	22,607
Contractual cash flows	25,915
Contractual obligation, due less than 1 year	3,307
Contractual obligation, due 1-3 years	5,422
Contractual obligation, due 4-5 years	4,753
Contractual obligation, due after 5 years	12,433
Accounts payable and accrued liabilities
Other Commitments [Line Items]
Carrying amount	95,374
Contractual cash flows	95,374
Contractual obligation, due less than 1 year	95,374
Contractual obligation, due 1-3 years	0
Contractual obligation, due 4-5 years	0
Contractual obligation, due after 5 years	0
Short-term debt (note 14)
Other Commitments [Line Items]
Carrying amount	15,156
Contractual cash flows	15,156
Contractual obligation, due less than 1 year	15,156
Contractual obligation, due 1-3 years	0
Contractual obligation, due 4-5 years	0
Contractual obligation, due after 5 years	$ 0

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	Mar. 11, 2024	Jan. 10, 2024	Dec. 31, 2023	Dec. 31, 2022	Apr. 29, 2021
Subsequent Event [Line Items]
Loan agreement			$ 45,065	$ 43,862
Secured Debt
Subsequent Event [Line Items]
Loan agreement			42,879	41,934
Secured Debt | UniCredit Loan
Subsequent Event [Line Items]
Loan agreement			$ 6,793	$ 8,044	$ 8,803
Subsequent Event | Secured Debt | UniCredit Loan
Subsequent Event [Line Items]
Loan agreement		$ 3,835
Subsequent Event | Secured Debt | UniCredit Loan | Euribor
Subsequent Event [Line Items]
Basis spread on variable rate debt		1.52%
Subsequent Event | Volvo Group Joint Venture
Subsequent Event [Line Items]
Equity method investment, ownership percentage	45%
Initial consideration	$ 28,350