Westport Fuel Systems (WPRT) 40-F/A 16 Oct 15 2014 FY Annual report (Canada) (amended) Financial data

Document And Entity Information

Document And Entity Information	12 Months Ended
	Dec. 31, 2014shares
Document Information [Line Items]
Entity Registrant Name	WESTPORT INNOVATIONS INC
Entity Central Index Key	1,370,416
Document Type	40-F
Document Period End Date	Dec. 31, 2014
Amendment Flag	true
Amendment Description	Westport Innovations Inc. (the “Company” or the “Registrant”) is a Canadian issuer eligible to file its annual report pursuant to Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), on Form 40-F pursuant to the multi-jurisdictional disclosure system of the Exchange Act. The Company is a “foreign private issuer” as defined in Rule 3b-4 under the Exchange Act. Equity securities of the Company are accordingly exempt from Sections 14(a), 14(b), 14(c), 14(f) and 16 of the Exchange Act pursuant to Rule 3a12-3. This Amendment No. 2 on Form 40-F (“Amendment No. 2”) amends the Company’s Annual Report on Form 40-F for the year ended December 31, 2014 filed with the Securities and Exchange Commission on March 9, 2015 (the “Original Form 40-F”), and the Company's Amended Annual Report on Form 40-F/A filed on July 23, 2015 ("Amendment No.1"). This Amendment No. 2 amends the Report of Independent Registered Public Accounting Firm on the internal control over financial reporting of the Company which is included in Amendment No.1. This Amendment No.2 is being filed to amend the Report of Independent Registered Public Accounting Firm on the Company's internal control over financial reporting to clarify the reference relating to the audit report on the Company's 2014 audited consolidated financial statements. This Amendment No.2 is also being filed to recast Note 23 "Segment Information" to our 2014 audited consolidated financial statements to reflect the change in operating segments made by the Company in the first quarter of 2015. Comparable prior period information has been recast to reflect our revised segment presentation. The related sections in Management’s Discussion and Analysis have also been updated to reflect the revised segment reporting. Other than as discussed above, all information in the Original From 40-F as amended by Amendment No.1 is unchanged and is not reproduced in this Amendment No. 2. This Amendment No. 2 does not reflect events occurring after the date of the Original Audited Annual Financial Statements and Amendment No. 1 nor does it modify or update disclosures affected by subsequent events. Accordingly, this Amendment No. 2 should be read in conjunction with the Original Form 40-F as amended by Amendment No. 1.
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding	63,480,722
Document Fiscal Year Focus	2,014
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 93,282	$ 178,513
Short-term investments	723	32,091
Accounts receivable (note 5)	46,849	59,315
Inventories (note 6)	41,824	40,626
Prepaid expenses	4,641	6,072
Current portion of deferred income tax assets (note 19(b))	3,556	3,109
Total current assets	190,875	319,726
Long-term investments (note 7)	33,324	22,128
Other assets	3,819	2,245
Property, plant and equipment (note 9)	58,134	67,349
Intangible assets (note 10)	27,920	38,344
Deferred income tax assets (note 19(b))	271	379
Goodwill (note 11)	23,352	41,500
Total assets	337,695	491,671
Current liabilities:
Accounts payable and accrued liabilities (note 12)	55,502	54,792
Current portion of deferred revenue	1,782	6,727
Current portion of deferred income tax liabilities (note 19(b))	398	468
Current portion of long-term debt (note 13)	18,955	53,025
Current portion of warranty liability (note 14)	9,696	9,955
Total current liabilities	86,333	124,967
Warranty liability (note 14)	13,413	18,890
Long-term debt (note 13)	59,587	12,988
Deferred revenue	3,795	4,580
Deferred income tax liabilities (note 19(b))	4,954	4,903
Other long-term liabilities (note 15)	1,605	2,441
Total liabilities	169,687	168,769
Share capital (note 17):
Authorized: Unlimited common shares, no par value Unlimited preferred shares in series, no par value Issued: 63,480,722 (2013 - 62,733,762) common shares	930,857	916,497
Other equity instruments	7,767	13,834
Additional paid in capital	9,837	8,205
Accumulated deficit	(764,960)	(615,342)
Accumulated other comprehensive income	(15,493)	(292)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 168,008	$ 322,902
Commitments and contingencies (note 22)
Total liabilities and shareholders' equity	$ 337,695	$ 491,671

Consolidated Balance Sheets _Pa

Consolidated Balance Sheets [Parenthetical] - $ / shares	Dec. 31, 2014	Dec. 31, 2013
Common Stock, No Par Value	$ 0	$ 0
Preferred Stock, No Par Value	$ 0	$ 0
Common shares, shares issued (in shares)	63,480,722	62,733,762

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Product revenue	$ 118,015	$ 148,001	$ 132,382
Service and other revenue (note 21)	12,554	16,031	23,244
Revenue, Net	130,569	164,032	155,626
Cost of revenue and expenses:
Cost of product revenue	97,923	148,690	102,486
Research and development (note 17(d) and 18)	76,580	91,132	73,198
General and administrative (note 17(d))	40,319	46,475	44,811
Sales and marketing (note 17(d))	25,489	28,707	30,112
Foreign exchange (gain) loss	(3,434)	(15,168)	1,185
Depreciation and amortization (note 9 and 10)	18,666	16,288	11,395
Bank charges, interest and other	703	595	737
Impairment of long lived assets	5,238	4,838	0
Provision for inventory purchase commitments (note 12 and 22(b))	4,106	0	0
Intangible impairment (note 10)	5,823	1,721	0
Goodwill impairment (note 11)	18,543	34,964	0
Cost of Revenue	289,956	358,242	263,924
Loss from operations	(159,387)	(194,210)	(108,298)
Income from investments accounted for by the equity method	14,222	13,444	16,190
Interest on long-term debt and amortization of discount	(5,849)	(4,789)	(5,354)
Interest and other income	817	1,018	426
Loss before income taxes	(150,197)	(184,537)	(97,036)
Income tax expense (recovery) (note 19):
Current	606	1,414	2,147
Deferred	(1,185)	(541)	(409)
Income Tax Expense (Benefit)	(579)	873	1,738
Net loss for the year	(149,618)	(185,410)	(98,774)
Other comprehensive income (loss):
Cumulative translation adjustment	(15,201)	(17,308)	3,745
Comprehensive loss	$ (164,819)	$ (202,718)	$ (95,029)
Loss per share:
Basic and diluted (in dollars per share)	$ (2.37)	$ (3.22)	$ (1.83)
Weighted average common shares outstanding:
Basic and diluted (in shares)	63,130,022	57,633,190	54,072,513

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Share capital [Member]	Other equity instruments [Member]	Additional paid in capital [Member]	Accumulated deficit [Member]	Accumulated other comprehensive income [Member]
Balance at Dec. 31, 2011	$ 152,590	$ 459,866	$ 6,112	$ 4,499	$ (331,158)	$ 13,271
Balance (in shares) at Dec. 31, 2011		48,455,601
Issue of common shares on exercise of stock options	969	$ 1,492	0	(523)	0	0
Issue of common shares on exercise of stock options (in shares)		93,044
Issue of common shares on exercise of share units	0	$ 6,597	(6,597)	0	0	0
Issue of common shares on exercise of share units (in shares)		420,446
Issue of common shares on public offering	273,556	$ 273,556	0	0	0	0
Issue of common shares on public offering (in shares)		6,325,000
Share issue costs	(8,126)	$ (8,126)	0	0	0	0
Stock-based compensation	12,121	0	9,713	2,408	0	0
Net loss for the year	(98,774)	0	0	0	(98,774)	0
Other comprehensive loss	3,745	0	0	0	0	3,745
Balance at Dec. 31, 2012	336,081	$ 733,385	9,228	6,384	(429,932)	17,016
Balance (in shares) at Dec. 31, 2012		55,294,091
Issue of common shares on exercise of stock options	741	$ 1,147	0	(406)	0	0
Issue of common shares on exercise of stock options (in shares)		111,986
Issue of common shares on exercise of share units	0	$ 10,599	(10,599)	0	0	0
Issue of common shares on exercise of share units (in shares)		609,200
Issue of common shares in connection with acquisition	24,091	$ 24,091	0	0	0	0
Issue of common shares in connection with acquisition (in shares)		718,485
Acquisition to be settled by issuance of common shares	3,285	$ 0	3,285	0	0	0
Issue of common shares on public offering	152,340	$ 152,340	0	0	0	0
Issue of common shares on public offering (in shares)		6,000,000
Share issue costs	(5,065)	$ (5,065)	0	0	0	0
Stock-based compensation	14,147	0	11,920	2,227	0	0
Net loss for the year	(185,410)	0	0	0	(185,410)	0
Other comprehensive loss	(17,308)	0	0	0	0	(17,308)
Balance at Dec. 31, 2013	322,902	$ 916,497	13,834	8,205	(615,342)	(292)
Balance (in shares) at Dec. 31, 2013		62,733,762
Issue of common shares on exercise of stock options	242	$ 374	0	(132)	0	0
Issue of common shares on exercise of stock options (in shares)		43,071
Issue of common shares on exercise of share units	0	$ 10,701	(10,701)	0	0	0
Issue of common shares on exercise of share units (in shares)		608,975
Issue of common shares in connection with acquisition	0	$ 3,285	(3,285)	0	0	0
Issue of common shares in connection with acquisition (in shares)		94,914
Stock-based compensation	9,683	$ 0	7,919	1,764	0	0
Net loss for the year	(149,618)	0	0	0	(149,618)	0
Other comprehensive loss	(15,201)	0	0	0	0	(15,201)
Balance at Dec. 31, 2014	$ 168,008	$ 930,857	$ 7,767	$ 9,837	$ (764,960)	$ (15,493)
Balance (in shares) at Dec. 31, 2014		63,480,722

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Loss for the period	$ (149,618)	$ (185,410)	$ (98,774)
Items not involving cash:
Depreciation and amortization	18,666	16,288	11,395
Stock-based compensation expense	9,683	14,283	12,468
Unrealized foreign exchange gain	(3,434)	(15,168)	1,185
Deferred income tax (recovery) expense	(1,185)	(541)	(409)
Income from investments accounted for by the equity method	(14,222)	(13,444)	(16,190)
Amortization of long-term debt	2,139	1,643	2,094
Impairment of long lived assets	5,238	4,838	0
Inventory write-downs to net realizable value	2,102	4,925	0
Provision for inventory purchase commitments (note 12 and 22(b))	4,106	0	0
Intangible impairment	5,823	1,721	0
Goodwill impairment	18,543	34,964	0
Change in fair value of derivative liability and bad debt expense	1,338	(37)	340
Changes in non-cash operating working capital:
Accounts receivable	11,629	(12,289)	6,733
Inventories	(1,367)	5,179	(7,920)
Prepaid expenses	(556)	513	179
Accounts payable and accrued liabilities	(4,749)	(2,064)	(742)
Deferred revenue	(5,096)	5,208	3,115
Warranty liability	(5,797)	22,602	1,979
Net cash provided by operating activities	(106,757)	(116,789)	(84,547)
Cash flows from investing activities:
Purchase of property, plant and equipment	(10,249)	(26,450)	(30,363)
Purchase of intangible assets	0	0	(989)
Maturity (purchase) of short-term investments, net	31,369	(5,771)	(22,520)
Repayment of loan receivable	0	0	2,494
Increase loan payable	0	0	2,450
Repayment of loan payable	0	0	(21,840)
Acquisitions, net of acquired cash (note 4)	(3,053)	1,178	(1,125)
Dividends received from joint ventures	3,200	8,287	22,600
Net cash used in investing activities	21,267	(22,756)	(49,293)
Cash flows from financing activities:
Increase in operating lines of credit	0	0	4,245
Repayment of long term facilities	(9,540)	(13,678)	(9,843)
Issuance of long term debenture notes	17,797	0	0
Finance costs incurred	(2,033)	0	0
Proceeds from stock options exercised	242	741	969
Shares issued for cash	0	152,340	273,556
Share issuance costs	0	(5,065)	(8,126)
Net cash used in financing activities	6,466	134,338	260,801
Effect of foreign exchange on cash and cash equivalents	(6,207)	(5,238)	(1,288)
(Decrease) increase in cash and cash equivalents	(85,231)	(10,445)	125,673
Cash and cash equivalents, beginning of period	178,513	188,958	63,285
Cash and cash equivalents, end of period	93,282	178,513	188,958
Supplementary information:
Interest paid	4,702	3,911	3,532
Taxes paid, net of refunds	871	1,321	1,982
Non-cash transactions:
Shares issued on exercise of performance share units	10,701	10,599	6,597
Common shares issued in connection with acquisitions (note 4b)	$ 3,285	$ 24,091	$ 0

Company organization and operat

Company organization and operations	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations [Text Block]	1. Company organization and operations: Westport Innovations Inc. (the “Company”) was incorporated under the Business Corporations Act (Alberta) on March 20, 1995. The Company is a provider of high-performance, low-emission engine and fuel system technologies utilizing gaseous fuels. Its technology and products enable light (< 5.9 5.9 10 11 16 16 The Company is focused on developing technology to enable more environmentally sustainable engines without compromising the performance, fuel economy, durability and reliability of diesel engines. The substitution of natural gas for petroleum-based fuel drives a significant reduction in harmful combustion emissions, such as nitrogen oxides, particulate matter and greenhouse gas, in addition to using an abundant, relatively inexpensive alternative fuel. The Company’s systems can be used to enable combustion engines to use gaseous fuels, such as natural gas, propane, renewable natural gas or hydrogen. The Company’s research and development effort and investment have resulted in a substantial patent portfolio that serves as the foundation for its differentiated technology offerings and competitive advantage.

Significant accounting policies

Significant accounting policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]	2. Significant accounting policies: (a) Basis of presentation: The consolidated financial statements include the accounts of the Company, its wholly owned subsidiaries and variable interest entities (“VIEs”) for which the Company is considered the primary beneficiary. 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 of America (“U.S. GAAP”). The Company has sustained net losses over the past several years and as at December 31, 2014 have an accumulated a deficit of $ 765.0 93.3 (b) Foreign currency translation: The Company’s reporting currency for its consolidated financial statement presentation is the United States dollar. The functional currencies of the Company’s operations and subsidiaries include the following: United States, Canadian and Australian dollar, Euro, Chinese Renminbi (“RMB”), and Swedish Krona. The Company translates assets and liabilities of non-US 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. Transactions that are denominated in currencies other than the functional currency of the Company’s operations or its subsidiaries are translated at the rate 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 rate 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 statement of operations, except for the translation gains and losses arising from available-for-sale instruments, which are recorded through other comprehensive income until realized through disposal or impairment. Except as otherwise noted, all amounts in these financial statements are presented in U.S. dollars. Period end exchange rate as at: Average for the year ended: December 31, 2014 December 31, 2013 December 31, 2014 December 31, 2013 Canadian dollar 0.86 0.94 0.91 0.97 Australian dollar 0.82 0.89 0.90 0.97 Euro 1.21 1.38 1.33 1.33 RMB 0.16 0.17 0.16 0.16 Swedish Krona 0.13 0.16 0.15 0.15 (c) Cash and cash equivalents: Cash and cash equivalents includes cash, term deposits, bankers acceptances and guaranteed investment certificates with maturities of ninety days or less when acquired. Cash equivalents are considered as held for trading and recorded at fair value with changes in fair value recognized in the consolidated statements of operations. (d) Short-term investments: Short-term investments, consisting of investment grade commercial paper, banker acceptances, bearer deposit notes, guaranteed investment certificates and other term deposits, are considered available for sale and recorded at fair value with changes in fair value recognized in accumulated other comprehensive income until realized. A decline in value that is considered other than temporary is recognized in net loss for the period. (e) Account s receivable , net : Accounts receivable are measured at amortized cost. The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. Management considers the following factors when determining the collectibility of specific customer accounts: customer credit-worthiness, past transaction history with the customer, current economic industry trends, and changes in customer payment terms. Past due balances over 90 days and other higher risk amounts are reviewed individually for collectibility. If the financial condition of the Company’s customers were to deteriorate, adversely affecting their ability to make payments, additional allowances would be required. Based on management’s assessment, the Company provides for estimated uncollectible amounts through a charge to earnings and a credit to a valuation allowance. Balances that remain outstanding after the Company has used reasonable collection efforts are written off through a charge to the valuation allowance and a credit to accounts receivable. (f) 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. Cost is determined based on the lower of weighted average 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. (g) Property, plant and equipment: Assets Basis Rate Buildings Straight-line 15 years Computer equipment and software Straight-line 3 years Furniture and fixtures Straight-line 5 years Machinery and equipment Straight-line 8 – 10 years Leasehold improvements Straight-line Lease term (h) Long-term investments: The Company accounts for investments in which it has significant influence, including VIEs for which the Company is not the primary beneficiary, using the equity basis 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. (i) Financial liabilities: Accounts payable and accrued liabilities, short-term debt and long-term debt are measured at amortized cost. Transaction costs relating to long-term debt are deferred in other assets on initial recognition and are amortized using the effective interest rate method. (j) Research and development costs: Research and development costs are expensed as incurred and are recorded net of government funding received or receivable. (k) Government assistance: The Company periodically applies for financial assistance under available government incentive programs, which is recorded in the period it is received or receivable. Government assistance relating to the purchase of property, plant and equipment is reflected as a reduction of the cost of such assets. Government assistance related to research and development activities is recorded as a reduction of the related expenditures. (l) Intangible assets: Intangible assets consist primarily of the cost of intellectual property, trademarks, technology, customer contracts and non-compete agreements. Intangible assets are amortized over their estimated useful lives, which range from 5 20 (m) 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. (n) Goodwill impairment: 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. 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 November 30. 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. A two-step test is used to identify a potential impairment and to measure the amount of impairment, if any. The first step is to compare the fair value of the reporting unit with its carrying amount, including goodwill. If the fair value of the reporting unit exceeds its carrying amount, goodwill is considered not impaired; otherwise, goodwill is impaired and the loss is measured by performing step two. Under step two, the impairment loss is measured by comparing the implied fair value of the reporting unit goodwill with the carrying amount of goodwill. Fair value is determined using widely accepted valuation techniques, which may include discounted cash flows and market multiple analyses. These types of analyses contain uncertainties because they require management to make assumptions and to apply judgment to estimate industry economic factors and the profitability of future business strategies. (o) 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 for a period ending two years 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 cost 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 upon shipment using a factor based upon historical experience from previous engine 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. Since a number of the Company’s products are new in the market, historical data may not necessarily reflect actual costs to be incurred and may result in significant fluctuations in the warranty liability. (p) Extended warranty: The Company sells extended warranty contracts that provide coverage in addition to the basic warranty coverage. Proceeds from the sale of these contracts are deferred and amortized over the extended warranty period commencing at the end of the basic warranty period. On a periodic basis, management reviews the estimated costs expected to be incurred related to servicing these contracts and recognizes a loss to the extent such costs exceed the related deferred revenue. Extended warranty costs are expensed as period costs as incurred. (q) Revenue recognition: Product revenue The Company’s primary source of revenue is from the sale of kits, Westport LNG systems and parts, and Westport CNG and LPG fuel systems for OEMs in the light-duty automotive and industrial markets. Product revenue is recognized when contractual terms are agreed upon, the price is fixed or determinable, the products are shipped and title passes to the customer and collectability is reasonably assured. Revenue from research and development The Company also earns service revenue from research and development arrangements under which the Company provides contract services relating to developing natural gas engines or biogas engines for use in products and providing ongoing development services to assist with the development and commercialization of products. These contracts provide for the payment for services based on our achieving defined milestones or on the performance of work under product development programs. Revenues are recognized using the milestone method based on assessment of progress achieved against the defined milestones. Revenue may also be recognized using the proportionate performance method of accounting based on the performance of work under the research and development arrangement. There is a risk that a customer may ultimately disagree with our assessment of the progress achieved against milestones or that our estimates of the percentage of work completed could change. Should this occur, the revenues recognized in the period might require adjustment in a subsequent period. All costs incurred related to revenue earned from research and development arrangements are recorded as research and development expense as incurred. Revenue from contracts The Company earns revenue under certain contracts to provide engineering development services. These contracts provide for the payment for services based on the performance of work under product development programs. Revenues are recognized under these contracts based on the percentage of completion method of accounting. The components to measure percentage of completion are complex and subject to many variables. Components may include estimated costs to complete a contract, estimated hours to completion or management’s assessment of work to be performed. When estimates of total costs to be incurred on a contract exceed total estimates of revenue to be earned, a provision for the entire loss on the contract is recorded in the period the loss is determined. There is a risk that the estimated percentage of completion of a contract may change, which may result in an adjustment to previously recognized revenues. All costs incurred related to revenue earned from contracts are recorded in cost of products sold. Arrangements with customers may include multiple deliverables, including any combination of products, services, and licenses. In these arrangements, the Company allocates revenue to all deliverables based on their relative selling prices. The Company uses a hierarchy to determine the selling price to be used for allocating revenue to deliverables: (a) vendor-specific objective evidence of fair value (VSOE), (b) third-party evidence of selling price (TPE), and (c) best estimate of selling price (BESP), which are determined as follows: VSOE-In limited circumstances are products sold separately in stand-alone arrangements. In determining VSOE, the Company requires that a substantial majority of the selling prices for a product or service falls within a reasonably narrow pricing range, generally evidenced by the pricing rates of approximately 85% of such historical stand-alone transactions falling within plus or minus 10% of the median rate. TPE-VSOE exists only when the Company sells the deliverable separately. When VSOE does not exist, the Company attempts to determine TPE based on competitor prices for similar deliverables when sold separately. Generally, the Company’s go-to-market strategy for many of its products differs from that of its peers and its offerings contain a significant level of customization and differentiation such that the comparable pricing of products with similar functionality sold by other companies cannot be obtained. Furthermore, the Company is unable to reliably determine what similar competitor products’ selling prices are on a stand-alone basis. Therefore, the Company is typically not able to determine TPE. BESP-The objective of BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. When both VSOE and TPE do not exist, the Company determines BESP by first collecting all reasonably available data points including sales, cost and margin analysis of the product, and other inputs based on the Company’s normal pricing practices. Second, the Company makes any reasonably required adjustments to the data based on market and Company-specific factors. Third, the Company stratifies the data points, when appropriate, based on customer, magnitude of the transaction and sales volume. Once elements of an arrangement are separated into more than one unit of accounting, revenue is recognized for each separate unit of accounting based on the nature of the revenue as described above. Changes in cost estimates and the fair values of certain deliverables could negatively impact the Company’s operating results. In addition, unforeseen conditions could arise over the contract term that may have a significant impact on the Company’s operating results. License revenue Revenue from technology license fees is recognized over the duration of the licensing agreement. Amounts received in advance of the revenue recognition criteria being met are recorded as deferred revenue. 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 the 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. 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.

Accounting Changes

Accounting Changes	12 Months Ended
	Dec. 31, 2014
Accounting Changes and Error Corrections [Abstract]
Accounting Changes and Error Corrections [Text Block]	3. Accounting Changes (a) Adoption of new accounting standards: Income taxes: In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carry forward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (b) New accounting pronouncements: Revenue: In May 2014, Financial Accounting Standards Board (“FASB”) issued ASU 2014-09, Revenue From Contracts With Customers (“Topic 606”) Revenue Recognition Revenue Recognition - Construction-Type and Production-Type Contracts Going Concern: In August 2014, the FASB issued ASU 2014-15. Presentation of Financial Statements - Going Concern

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	(a) Acquisition of Prins Autogassystemen Holding B.V. On December 2, 2014 (“the acquisition date”), the Company acquired 100 12,200 15,017 2,500 3,112 9,700 11,905 The Company recognized $ 342 The estimated fair values of assets acquired and liabilities assumed are provisional and are based on the information that was available as of the acquisition date to estimate the fair value of assets acquired and liabilities assumed. The Company believes that information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed, but the Company is waiting for additional information necessary to finalize those fair values. Therefore, the provisional measurements of fair value reflected are subject to change and such changes could be significant. The Company expects to finalize the valuation and complete the purchase price allocation as soon as practicable but no later than one year from the acquisition date. Consideration allocated to: Other tangible assets, including cash of $61 $ 13,138 Property, plant and equipment 3,824 Intangible assets subject to amortization over 5 years 3,024 Goodwill 3,221 Total assets acquired $ 23,207 Less: Current liabilities 7,211 Deferred income tax liabilities 979 Debt assumed (note 13b and c) 11,905 $ 20,095 Total net assets acquired $ 3,112 Consideration: Paid to sellers $ 3,112 Intangible Assets 3,024 5 Inventory The fair value of $ 4,975 Goodwill Of the total consideration paid, $3,221 has been allocated to goodwill. The entire goodwill recognized is assigned to the Westport Operations and is not deductible for tax purposes. Land and Building The fair value of $ 3,824 15 The consolidated financial statements reflect consolidated revenue and net loss for Prins of $ 1,196 (301) Pro forma results The following unaudited supplemental pro forma information presents the consolidated financial results as if the acquisition of Prins had occurred on January 1, 2013. Years ended December 31, 2014 2013 Revenue Revenue for the period $ 130,569 $ 164,032 Add: BAF - see (note 4(b)) — 7,249 Add: Prins 30,993 30,885 Pro forma revenue for the period $ 161,562 $ 202,166 Net Loss Net loss for the period $ (149,618) $ (185,410) Add: BAF - see (note 4(b)) (4,038) Add: Prins 91 9,164 Pro forma net loss for the period $ (149,527) $ (180,284) These amounts have been calculated after applying the Company’s accounting policies and adjusting the results of Prins to reflect the additional depreciation and amortization that would have been charged assuming the fair value adjustments to property, plant and equipment and intangible assets had been applied on January 1, 2013, together with the consequential tax effects. (b) Acquisition of BAF Technologies, Inc. (“BAF”): On June 28, 2013 (“the acquisition date”), the Company acquired 100 Pursuant to the Stock Purchase Agreement, the acquisition was settled with 816,460 30.62 718,485 24,091 97,975 3,285 33.53 As part of the business acquisition, the Company entered into a marketing agreement (“Marketing Agreement”) with Clean Energy, effective on the acquisition date for a period of two years. The Company was required to make a cash payment of $ 5,000 The products and services received pursuant to the Marketing Agreement have been accounted for as a separate transaction from the business combination and the Company has determined the fair value of these products and services to be $ 2,678 The excess of the consideration payable of $ 5,000 2,322 The following table summarizes management’s final fair market valuation of the assets acquired and liabilities assumed at the acquisition date based on the results of a valuation report issued by a third-party valuation firm. Consideration allocated to: Other tangible assets, including cash of $1,178 $ 9,116 Property, plant and equipment 905 Intangible assets subject to amortization over 3 to 10 years 7,729 Goodwill 18,542 Total assets acquired 36,292 Less: total liabilities (6,594) Total net assets acquired $ 29,698 Consideration: Payable to Clean Energy $ 2,322 Common shares issued 24,091 Common shares to be issued 3,285 $ 29,698 The Company recognized $ 493 Intangible Assets Weighted average Assigned fair value amortization period Customer relationships $ 6,350 8 years Core technology 160 10 years Other intangibles 1,219 3 years Total $ 7,729 7 years Inventory The fair value of $ 5,792 Deferred Income taxes The Company recognized a deferred income tax liability of $ 296 Goodwill Of the total consideration paid, $ 18,542 The consolidated financial statements reflect consolidated revenue and net loss for BAF of $ 17,097 3,512 Pro froma results The following unaudited supplemental pro forma information presents the consolidated financial results as if the acquisition of BAF had occurred on January 1, 2012. This supplemental pro forma information has been prepared for comparative purposes and does not purport to be indicative of what would have occurred had the acquisition been made on January 1, 2012, nor are they indicative of any future results. Years ended December 31, 2013 2012 Revenue $ 171,281 $ 181,972 Net loss $ (189,448) $ (100,946) These amounts have been calculated after applying the Company’s accounting policies and adjusting the results of BAF to reflect the additional depreciation and amortization that would have been charged assuming the fair value adjustments to property, plant and equipment and intangible assets had been applied on January 1, 2012, together with the consequential tax effects.

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	5. Accounts Receivable: December 31, 2014 December 31, 2013 Customer trade receivable $ 43,256 $ 54,017 Government funding receivable 38 483 Due from joint venture (note 20) 2,538 3,621 Other receivables 3,269 2,689 Income tax receivable 499 77 Allowance for doubtful accounts (2,751) (1,572) $ 46,849 $ 59,315

Inventories

Inventories	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventory Disclosure [Text Block]	6. Inventories: December 31, 2014 December 31, 2013 Purchased parts $ 28,227 $ 23,228 Work-in-process 4,879 10,770 Finished goods 8,718 6,628 $ 41,824 $ 40,626 During the year ended December 31, 2014, the Company recorded write-downs to net realizable value of approximately $ 2,102 4,925 233

Long-term investments

Long-term investments	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Cost and Equity Method Investments Disclosure [Text Block]	7. Long-term investments: December 31, 2014 December 31, 2013 Weichai Westport Inc. (a) $ 18,791 $ 14,534 Cummins Westport Inc. (b) 13,196 7,191 Other equity accounted for investees 1,337 403 $ 33,324 $ 22,128 (a) Weichai Westport Inc.: On July 3, 2010, the Company invested $ 4,316 955 35 For the year ended December 31, 2014, the Company recognized its share of WWI’s income of $ 6,027 4,264 2,881 December 31, December 31, 2014 2013 Current assets: Cash and short-term investments $ 11,734 $ 4,696 Accounts receivable 72,121 31,967 Inventory 83,594 80,412 Other current assets 1,249 176 Long-term assets Property, plant and equipment 5,736 7,021 Deferred income tax assets 7,781 6,874 Total assets $ 182,215 $ 131,146 Current liabilities: Accounts payable and accrued liabilities $ 128,838 $ 93,016 Total liabilities $ 128,838 $ 93,016 Years ended December 31, 2014 2013 2012 Product revenue $ 618,465 $ 466,580 $ 272,086 Cost of revenue and expenses: Cost of product revenue 565,943 429,238 247,299 Operating expenses 32,227 22,846 15,022 598,170 452,084 262,321 Income before income taxes 20,295 14,496 9,765 Income tax expense 3,076 2,315 1,536 Income for the period $ 17,219 $ 12,181 $ 8,229 (b) Cummins Westport Inc.: The Company entered into a joint venture with Cummins on March 7, 2001. On December 16, 2003, the Company and Cummins amended the joint venture agreement (“JVA”) focusing CWI on developing markets for alternative fuel engines. In addition, the two companies signed a Technology Partnership Agreement that creates a flexible arrangement for future technology development between Cummins and the Company. On February 20, 2012, the JVA was amended and restated to provide for, among other things, clarification concerning the scope of products within CWI. In addition, the parties have revised certain economic terms of the JVA. The joint venture has a term of ten years from the date of the JVA and can be terminated under certain circumstances before the end of the term, including in the event of a material breach of the agreement by, or in the event of a change of control of one of the parties. Prior to February 20, 2012, the Company and Cummins shared equally in the profits and losses of CWI. Under the new JVA, profits and losses are shared equally up to an established revenue baseline, then any excess profit will be allocated 75 25 The Company has determined that CWI is a variable interest entity ("VIE"). Cummins and Westport each own 50 The Company has not historically provided and does not intend to provide financial or other support to CWI that the Company is not contractually required to provide. For the year ended December 31, 2014, the Company recognized its share of CWI’s income of $ 8,136 9,433 13,232 December 31, 2014 December 31, 2013 Current assets: Cash and short-term investments $ 107,415 $ 73,736 Accounts receivable 12,741 4,645 Current portion of deferred income tax assets 21,967 13,958 Other current assets 116 210 Long-term assets: Property, plant and equipment 1,294 1,096 Deferred income tax assets 29,408 21,698 Total assets $ 172,941 $ 115,343 Current liabilities: Current portion of warranty liability $ 48,818 $ 18,395 Current portion of deferred revenue 8,029 5,478 Accounts payable and accrued liabilities 6,419 7,772 63,266 31,645 Long-term liabilities: Warranty liability 43,983 49,174 Deferred revenue 34,345 17,815 Other long-term liabilities 2,771 2,400 81,099 69,389 Total liabilities $ 144,365 $ 101,034 Years ended December 31, 2014 2013 2012 Product revenue $ 283,551 $ 261,012 $ 161,741 Parts revenue 53,683 49,639 36,274 337,234 310,651 198,015 Cost of revenue and expenses: Cost of product and parts revenue 270,832 246,403 136,575 Research and development 21,131 21,522 12,114 General and administrative 1,202 1,348 1,417 Sales and marketing 22,514 17,839 12,541 Foreign exchange (gain) loss 34 (7) (18) Bank charges, interest and other 805 607 472 316,518 287,712 163,101 Income from operations 20,716 22,939 34,914 Interest and investment income 260 117 530 Income before income taxes 20,976 23,056 35,444 Income tax expense (recovery): Current 21,514 24,600 16,362 Deferred (15,719) (18,566) (6,517) 5,795 6,034 9,845 Income for the period $ 15,181 $ 17,022 $ 25,599

Variable interest entities

Variable interest entities	12 Months Ended
	Dec. 31, 2014
Variable Interest Entities [Abstract]
Variable Interest Entities [Text Block]	8. Variable interest entities: Cummins and Westport each own 50 Prior to February 20, 2012, the Company and Cummins shared equally in the profits and losses of CWI. Under the new Joint Venture Agreement, profits and losses are shared equally up to an established revenue baseline, and then any excess profits will be allocated 75 25 Balance at December 31, 2014 Balance at December 31, 2013 Carrying Maximum Carrying Maximum Equity method investment $ 13,196 $ 13,196 $ 7,191 $ 7,191 Accounts receivable 2,538 2,538 3,621 3,621

Property, plant and equipment

Property, plant and equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	9. Property, plant and equipment: Accumulated Net book December 31, 2014 Cost depreciation value Land and buildings $ 3,015 $ — $ 3,015 Computer equipment and software 9,277 7,063 2,214 Furniture and fixtures 6,194 1,798 4,396 Machinery and equipment 81,933 36,135 45,798 Leasehold improvements 12,460 9,749 2,711 $ 112,879 $ 54,745 $ 58,134 Accumulated Net book December 31, 2013 Cost depreciation value Computer equipment and software $ 9,652 $ 6,174 $ 3,478 Furniture and fixtures 6,608 1,692 4,916 Machinery and equipment 86,067 32,099 53,968 Leasehold improvements 15,084 10,097 4,987 $ 117,411 $ 50,062 $ 67,349 As at December 31, 2014, equipment with a cost of $ 16,572 18,788 1,714 5,465 Depreciation expense for the year ended December 31, 2014 was $ 14,106 12,246 8,131

Intangible assets

Intangible assets	12 Months Ended
	Dec. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Intangible Assets Disclosure [Text Block]	10. Intangible assets: Accumulated Net book December 31, 2014 Cost amortization value Patents and trademarks $ 18,425 $ 3,445 $ 14,980 Technology (1) 6,449 3,142 3,307 Customer contracts (1) 13,762 4,163 9,599 Other intangibles (1) 62 28 34 Total $ 38,698 $ 10,778 $ 27,920 Accumulated Net book December 31, 2013 Cost amortization value Patents and trademarks $ 20,974 $ 2,900 $ 18,074 Technology 7,468 2,796 4,672 Customer contracts (2) 18,447 3,886 14,561 Other intangibles 1,262 225 1,037 Total $ 48,151 $ 9,807 $ 38,344 (1) The Company reviews its long-lived assets for impairment including property, plant and equipment, and intangible assets whenever events and changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Based on the revenue and operating results and decline in the oil price, the Company concluded there were impairment indicators requiring the performance of a long-lived assets impairment test for customer contracts, technology and other intangibles as of November 30, 2014. Accordingly non-cash impairment charges aggregating to $ 5,823 115 4,705 1,003 (2) During the year ended December 31, 2013, there was a significant decline in revenue from the lower than expected adoption rate of natural gas vehicles in our customer contracts. An impairment analysis of the intangibles balance indicated that the carrying value exceeded the fair value of customer contracts. Accordingly, an intangible impairment charge of $ 1,721 During the year ended December 31, 2014, amortization of $ 4,560 4,042 3,264 The expected amortization of intangible assets for fiscal 2015 to 2019 is $ 3,345

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2014
Goodwill Disclosure [Abstract]
Goodwill Disclosure [Text Block]	11. Goodwill: December 31, 2014 December 31, 2013 Balance, beginning of period: $ 41,500 $ 56,879 Acquisition of Prins (note 4(a)) 3,221 — Acquisition of BAF (note 4(b)) — 18,542 Impairment losses (18,543) (34,964) Impact of foreign exchange changes (2,826) 1,043 Balance, end of period $ 23,352 $ 41,500 An assessment of the carrying value of goodwill was conducted as of November 30, 2014. Based on the Company’s assessment, it was determined that the carrying amount of goodwill exceeded the implied fair value of goodwill by $ 18,543 The remaining goodwill of $ 23,352 For the year ended December 31, 2013 an assessment of the carrying value of goodwill was conducted as of November 30, 2013. Based on the Company’s assessment, it was determined that the carrying amount of goodwill exceeded the implied fair value of goodwill by $ 34,964 34,964 For 2013 and 2014, the fair value of the reporting units was determined using the present value of expected future cash flows discounted at a rate equivalent to a market participant’s weighted-average cost of capital. The estimates and assumptions regarding expected future cash flows and the appropriate discount rates are in part based upon historical experience, financial forecasts and industry trends and conditions.

Accounts payable and accrued li

Accounts payable and accrued liabilities	12 Months Ended
	Dec. 31, 2014
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	Accounts payable and accrued liabilities: December 31, 2014 December 31, 2013 Trade accounts payable $ 41,796 $ 42,872 Accrued payroll 5,270 7,937 Accrued interest 1,237 893 Income taxes payable 580 709 Other payables (note 22b) 6,619 2,381 $ 55,502 $ 54,792

Long-term debt

Long-term debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Long-term Debt [Text Block]	Long-term debt: December 31, 2014 December 31, 2013 Subordinated debenture notes (a) $ 46,491 $ 33,847 Senior financing (b) 15,910 15,941 Senior revolving financing (c) 12,101 13,779 Other bank financing (d) 2,646 403 Capital lease obligations (e) 1,394 2,043 78,542 66,013 Current portion (18,955) (53,025) $ 59,587 $ 12,988 (a) On September 23, 2011, the Company raised $ 33,720 36,000 9 The Initial Debentures were redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount of the debentures on or before March 22, 2013 On June 27, 2014, the Company raised $ 17,797 19,000 pari passu terms. The New Debentures totaling $ 51,517 55,000 33,720 36,000 September 15, 2017 Debentures are redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount debentures can be redeemed at a price equal to $1,100 per $1,000 principal amount. The New Debentures contain an extension option that will allow each debenture holder to have the option to extend, a maximum of six times 10,000 The Company has performed the assessment of embedded derivatives within the New Debentures and concluded that there is an embedded derivative that requires bifurcation related to the extension option from the New Debentures. The extension option was deemed not clearly and closely related to the New Debentures and is separately accounted for as a standalone derivative. The Company recorded this embedded derivative as a non-current liability on its consolidated balance sheet. At issuance on June 27, 2014, the embedded derivative’s fair value was determined to be $ 1,169 1,249 82 (1,082) (b) December 31, 2014 December 31, 2013 Emer Senior Financing (1) $ 9,376 $ 15,941 Prins Senior Financing (2) 3,630 — Prins Senior Mortgage Loan (3) 2,904 — $ 15,910 $ 15,941 (1) The Emer S.p.A (“Emer”) senior financing agreement bears interest at the 6-month Euribor 2.5 2.7 (2) A total of $7,521 Prins senior financing was assumed on the acquisition of Prins (note 4a). Principal of $ 3,891 3-month Euribor 3.5 3.6 (3) The Prins senior mortgage loan was assumed on the acquisition of Prins (note 4a). The senior mortgage loan bears interest at 3-month Euribor 1 1.1 Emer Senior Prins Senior Prins Senior Financing Financing Mortgage Loan Total 2015 $ 4,020 $ 1,633 $ 363 $ 6,016 2016 4,239 1,997 363 6,599 2017 1,117 — 363 1,480 2018 — — 363 363 2019 and thereafter — — 1,452 1,452 $ 9,376 $ 3,630 $ 2,904 $ 15,910 (c) The senior revolving financing facility bears interest at the 6-month Euribor 2.5 6,050 5,000 Throughout the entire term of these financing arrangements, the Company is required to meet certain financial and non-financial covenants. As of December 31, 2014, the Company is in compliance with all covenants under the financing arrangements. (d) December 31, 2014 December 31, 2013 Emer other financing (1) $ 1,129 $ 247 Prins other financing (2) 1,424 — Other financing 93 156 $ 2,646 $ 403 (1) Emer other financing consists of various unsecured bank financing arrangements that carry rates of interest ranging from 1.01 2.90 1.01 8.00 (2) Prins other bank financing consists of a credit facility for maximum borrowings of € 2,000 3 month Euribor 3.5 60 (e) The Company has capital lease obligations that have initial terms of three to five years at interest rates ranging from 3.07 4.93 3.07 7.32 2015 $ 522 2016 328 2017 327 2018 191 2019 26 $ 1,394 (f) The Company has a credit facility for maximum borrowings of CDN$ 30,000 0.75 0.75

Warranty liability

Warranty liability	12 Months Ended
	Dec. 31, 2014
Product Warranties Disclosures [Abstract]
Product Warranty Disclosure [Text Block]	14. Warranty liability: Years ended December 31, 2014 2013 2012 Balance, beginning of period $ 28,845 $ 6,380 $ 4,401 Warranty assumed on acquisition 1,952 582 — Warranty claims (10,709) (5,397) (3,099) Warranty accruals 2,734 4,153 5,303 Change in estimate — 22,837 — Impact of foreign exchange changes 287 290 (225) Balance, end of period $ 23,109 $ 28,845 $ 6,380 Less: Current portion (9,696) (9,955) (2,072) Long-term portion $ 13,413 $ 18,890 $ 4,308 During the fourth quarter of 2013, a study of the historical data indicated that the cost to repair product defects continued to increase significantly primarily associated with our extended warranty contracts. As a result, the Company recognized a change in estimate in our base warranty liability and a loss on our extended warranty contracts representing the excess of the estimated cost to service these contracts over the amount of the deferred revenue recognized associated with the contracts. The warranty liability was reviewed in the fourth quarter of 2014, and no change in estimate was required

Other long-term liabilities

Other long-term liabilities	12 Months Ended
	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Other Liabilities Disclosure [Text Block]	15. Other long-term liabilities: December 31, December 31, 2014 2013 Severance indemnity (a) $ 1,519 $ 1,547 Contingent consideration payable related to AFV acquisition (b) 1,240 878 Derivative Liability (note 13a) 86 — Deferred lease inducements — 16 $ 2,845 $ 2,441 Current portion (included in accounts payable and accrued liabilities, other payables) (1,240) — $ 1,605 $ 2,441 (a) Italian law requires companies to make a mandatory termination payment to employees. It is paid, as a lump sum, when the employment ends for any reason such as retirement, resignation or layoff. The severance indemnity liability is calculated in accordance with local civil and labour laws based on each employee’s length of service, employment category and remuneration. There is no vesting period or funding requirement associated with the liability. The liability recorded in the consolidated balance sheet is the amount that the employee would be entitled to if the employee terminates immediately. This liability for severance indemnities relates primarily to the Company’s employees in Italy. (b) The total purchase price to acquire AFV also includes earn-out payments payable in the Company’s shares and tied to revenue and production milestones to be achieved no later than December 31, 2014. This contingent consideration has a fair value of $ 407 427 The Company recorded compensation expense relating to two employees of AFV who receive earn-out payments in the Company’s shares that are tied to revenue and production milestones to be achieved no later than December 31, 2014 and contingent upon continuing employments. This contingent consideration has a fair value of $ 833 451 Subsequent to year end 325,073 4.51

Government assistance

Government assistance	12 Months Ended
	Dec. 31, 2014
Government Assistance Disclosure [Abstract]
Government Assistance Disclosure [Text Block]	16. Government assistance: From time to time, the Company enters into agreements for financial assistance with government agencies. During the years ended December 31, 2014, 2013 and 2012, government assistance of $ 892 640 842 Under the terms of an agreement with the Industry Canada’s Industrial Technologies Office (“ITO”), from April 1, 2008 to March 31, 2015, inclusively, the Company is obligated to pay annual royalties equal to the greater of $ 1,164 1,350 0.33 11,638 13,500 24,389 28,200 1,481 1,164 1,470 1,269 8,364 The Company is also obligated to pay royalties to the Government of Canada’s Department of Natural Resources equal to 1 1,000

Share capital, stock options an

Share capital, stock options and other stock-based plans	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	17. Share capital, stock options and other stock-based plans During the year ended December 31, 2014, the Company issued 652,046 721,186 513,490 On June 30, 2014 the Company issued 94,914 33.53 On October 1, 2013, the Company issued 6,000,000 25.39 152,340 5,065 On June 28, 2013, the Company issued 718,485 33.53 On February 27, 2012, the Company issued 6,325,000 43.25 273,556 8,126 At the Company's 2012 annual general meeting, the Company’s shareholders ratified and approved the Westport Omnibus Plan and reserved 8,000,000 The Executive and Senior Management Compensation Program sets out provisions where the RSUs and PSUs (together the “Units”) will be granted to the Company’s executive management if performance milestones are achieved as determined at the discretion of the Human Resources and Compensation Committee of the Company’s Board of Directors. These performance milestones are focused on achievement of key cash management, profitability and revenue growth objectives. Vesting periods and conditions for each Unit granted pursuant to the Westport Omnibus Plan are at the discretion of the Board of Directors and may include time based, share price or other performance targets. (a) Stock options: The Company grants incentive stock options to employees, directors, officers and consultants. Stock options are granted with an exercise price of not less than the market price of the Company’s common shares on the date immediately prior to the date of grant. The exercise period of the options may not exceed eight years from the date of grant. Vesting periods of the options are at the discretion of the Board of Directors and may be based on fixed terms, achieving performance milestones or reaching specified share price targets. December 31, 2014 December 31, 2013 December 31, 2012 Weighted Weighted Weighted average average average exercise exercise exercise Number of price Number of price Number of price shares (CDN $) shares (CDN $) shares (CDN $) Outstanding , beginning of period 816,450 $ 30.20 996,047 $ 27.78 328,027 $ 8.96 Granted — — — — 770,727 33.77 Exercised (43,071) 6.17 (111,986) 6.80 (93,044) 10.49 Forfeited/expired (741,156) 33.82 (67,611) 33.72 (9,663) 33.36 Outstanding, end of period 32,223 $ 17.64 816,450 $ 30.20 996,047 $ 27.78 Options exercisable, end of period 32,223 $ 17.64 305,506 $ 24.15 226,487 $ 8.06 During the year ended December 31, 2014, the Company recognized $ 1,764 2,094 2,705 No stock options were granted during the year ended December 31, 2014 or the year ended December 31, 2013. The fair value of the options granted during the year ended December 31, 2012 was determined using the Black-Scholes option pricing formula simulation with the following weighted average assumptions: expected dividend yield - nil%, expected stock price volatility – 47.79 0.38 3 10.97 As at December 31, 2014, an immaterial amount of compensation cost related to stock option awards has yet to be recognized in results from operations and will be fully recognized in 2015. (b) Share units: The value assigned to issued Units and the amounts accrued are recorded as other equity instruments. As Units are exercised or vest and the underlying shares are issued from treasury of the Company, the value is reclassified to share capital. During the year ended December 31, 2014, the Company recognized $ 7,919 12,189 9,763 December 31, 2014 December 31, 2013 December 31, 2012 Weighted Weighted Weighted average average average grant grant grant date fair date fair date fair Number of value Number of value Number of value units (CDN $) units (CDN $) units (CDN $) Outstanding, beginning of period 1,200,591 $ 23.68 1,095,094 $ 20.68 1,250,917 $ 18.04 Granted 5,792,162 10.54 742,140 30.21 185,705 35.99 Exercised/Vested (608,975) 19.52 (448,526) 24.44 (337,228) 19.34 Forfeited/expired (1,045,905) 21.75 (188,117) 29.80 (4,300) 19.67 Outstanding, end of period 5,337,873 $ 10.27 1,200,591 $ 23.68 1,095,094 $ 20.68 Units outstanding and exercisable, end of period 142,166 $ 11.67 224,638 $ 11.20 262,615 $ 8.86 During 2014, 5,792,162 742,140 4,820,763 352,485 971,399 389,655 963,575 54,876 As at December 31, 2014, $ 30,102 2.42 (c) Aggregate intrinsic values: December 31, December 31, 2014 2013 CDN$ CDN$ Stock options: Outstanding $ — $ 1,337 Exercisable — 1,337 Exercised 364 2,667 Share units: Outstanding $ 23,433 $ 24,960 Exercisable 624 4,670 Exercised 7,238 18,041 (d) Stock-based compensation: Years ended December 31, 2014 2013 2012 Research and development $ 1,749 $ 2,195 $ 2,251 General and administrative 5,884 10,201 6,752 Sales and marketing 2,050 1,887 3,465 $ 9,683 $ 14,283 $ 12,468

Research and development expens

Research and development expenses	12 Months Ended
	Dec. 31, 2014
Research and Development [Abstract]
Research, Development, and Computer Software Disclosure [Text Block]	18. Research and development expenses: Research and development expenses are recorded net of government assistance received or receivable. Years ended December 31, 2014 2013 2012 Research and development expenses $ 77,472 $ 91,772 $ 74,040 Government assistance (note 16) (892) (640) (842) Research and development $ 76,580 $ 91,132 $ 73,198

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	19. Income taxes: 26 26 25 Years ended December 31, 2014 2013 2012 Loss before income taxes $ (150,197) $ (184,537) $ (97,036) Expected income tax recovery (39,051) (47,979) (24,259) Increase (reduction) in income taxes resulting from: Non-deductible stock-based compensation 2,495 3,619 3,019 Other permanent differences (446) (2,562) (2,158) Withholding taxes 969 590 1,187 Change in enacted rates — — 62 Foreign tax rate differences, foreign exchange and other adjustments 7,409 3,858 (382) Non-taxable income from equity investment (3,739) (2,851) (3,308) Change in valuation allowance 25,784 37,391 27,577 Goodwill impairment 4,748 8,807 — Change in uncertain tax position 1,252 — — Income tax expense (recovery) $ (579) $ 873 $ 1,738 (b) The significant components of the deferred income tax assets and liabilities are as follows: December 31, 2014 December 31, 2013 Deferred income tax assets: Net loss carry forwards $ 129,258 $ 108,083 Intangible assets 4,091 4,276 Property, plant and equipment 6,836 5,446 Financing and share issuance costs 1,533 2,696 Warranty liability 5,131 5,726 Deferred revenue 1,416 1,191 Inventory 2,336 2,017 Research and development 2,733 2,341 Other 7,262 6,410 Total gross deferred income tax assets 160,596 138,186 Valuation allowance (152,207) (126,424) Total deferred income tax assets 8,389 11,762 Deferred income tax liabilities: Intangible assets 6,386 9,884 Property, plant and equipment 2,754 3,132 Other 774 650 Total deferred income tax liabilities 9,914 13,666 Total net deferred income tax liabilities $ 1,525 $ 1,904 Allocated as follows: Current deferred income tax assets 3,556 3,109 Current deferred income tax liabilities (398) (468) Long-term deferred income tax assets 271 379 Long-term deferred income tax liabilities (4,954) (4,903) Total net deferred income tax liabilities $ (1,525) $ (1,883) 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). The following is a summary of the changes in the deferred income tax asset valuation allowance: Year ended Year ended December 31, 2014 December 31, 2013 Beginning balance $ 126,424 $ 89,033 Additions 25,783 37,391 Reductions — — Ending valuation allowance $ 152,207 $ 126,424 (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, 2014: Canada $ (87,783) 165 301 $ 466 United States (49,577) 8 — 8 Italy (3,834) 521 (1,463) (942) Other (9,003) (88) (23) (111) $ (150,197) $ 606 $ (1,185) $ (579) Year ended December 31, 2013: Canada $ (99,188) $ 444 $ 89 $ 533 United States (31,019) 56 (295) (239) Italy (27,247) 836 (311) 525 Other (27,083) 78 (24) 54 $ (184,537) $ 1,414 $ (541) $ 873 Year ended December 31, 2012: Canada $ (93,688) $ 1,339 $ 53 $ 1,392 United States (1,589) (62) — (62) Italy (318) 775 25 800 Other (1,441) 95 (487) (392) $ (97,036) $ 2,147 $ (409) $ 1,738 (d) Expiring in: 2015 2016 2017 2018 2019 2020 and later Total Canada $ — $ — $ — $ — $ — $ 387,553,717 $ 387,553,717 Italy — — — — — 6,429,576 6,429,576 United States — — — — — 55,353,513 55,353,513 Sweden — — — — — 13,710,864 13,710,864 Other — — — 1,085,596 6,725,731 7,834,119 15,645,446 Total $ — $ — $ — $ 1,085,596 $ 6,725,731 $ 470,881,789 $ 478,693,116 (e) The Company has not recognized a deferred income tax liability for the undistributed earnings of certain foreign subsidiaries which are essentially investments in those foreign subsidiaries and are permanent in duration. (f) The Company records uncertain tax positions in accordance with ASC No. 740, Income Taxes. As at December 31, 2014, the total amount of the Company’s uncertain tax benefits was $ 1,230 Balance as of January 1, 2014 $ — Tax positions related to the current year: Additions — Reductions — $ — Tax positions related to prior years: Additions 1,230 Reductions — Settlements — Lapses in statutes of limitations — Balance as of December 31, 2014 $ 1,230

Related party transactions

Related party transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	20. Related party transactions: Pursuant to the amended and restated JVA, Westport engages in transactions with CWI. As at December 31, 2014, net amounts due from CWI total $ 2,538 3,621 Years ended December 31, 2014 2013 2012 Research and development $ 3 $ 178 $ 160 General and administrative 1,548 1,351 2,621 Sales and marketing 4,935 4,725 3,683 $ 6,486 $ 6,254 $ 6,464 During the year ended December 31, 2014, interest of $nil (year ended December 31, 2013 - $nil; year ended December 31, 2012 - $ 114

Service and other revenue

Service and other revenue	12 Months Ended
	Dec. 31, 2014
Service And Other Revenue [Abstract]
Service And Other Revenue Disclosure [Text Block]	21. Service and other revenue: Service and other revenue for the year ended December 31, 2014 consisted of a one-time license revenue of $nil (year ended December 31, 2013 - $nil; year ended December 31, 2012 - $ 7,923 1,480 1,484 1,414 11,074 14,547 13,907 During the year ended December 31, 2012, the Company entered into an agreement with an original equipment manufacturer (“OEM”) to co-develop natural gas technology for off-road equipment, including mining trucks and locomotives. Under the agreement, the Company provided its proprietary know-how related to the high pressure direct injection (“HPDI”) technology by granting a non-exclusive license to the OEM. The Company will also provide ongoing development services to the OEM to assist with the development and commercialization of products. These are considered to be multiple deliverables arrangements and the Company has determined that the license and the development services are separate units of accounting.

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Commitments and contingencies: (a) Contractual Commitments 2015 $ 3,946 2016 4,978 2017 5,890 2018 4,969 2019 4,960 Thereafter 33,125 $ 57,868 For the year ended December 31, 2014, the Company incurred operating lease expense of $ 3,879 5,675 4,492 As at December 31, 2014, the Company’s wholly owned subsidiary Emer has provided a total amount of guarantees to third parties of $ 298 342 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. The Company is engaged in certain legal actions in the ordinary course or business and believes that the ultimate outcome of these actions will not have a material adverse effect on our operating results, liquidity or financial position. (b) Purchase Commitments The Company purchases components from a variety of suppliers and contract manufacturers. During the normal course of business, in order to manage manufacturing lead times and help ensure adequate component supply, the Company enters into agreements with suppliers and contract manufacturers. A portion of our reported estimated purchase commitments arising from these agreements are firm, noncancelable, and unconditional commitments. The Company may be subject to penalties, and may lose important suppliers, if it is unable to meet its purchase commitments. In 2014, the Company entered into several long-term fixed price contracts to purchase parts to produce certain products. These contracts represent firm purchase commitments which are evaluated for potential market value losses. The Company estimated a loss on these firm purchase commitments with reference to the estimated future sales price of these products and recognized a provision for inventory purchase commitments of $ 4,106

Segmented information

Segmented information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	23. Segmented information: During the first quarter of 2015, Westport realigned the structure of the company's internal organization. The realignment combines, our historical operating segments, Westport Applied Technologies, Westport On-Road Systems and Westport Off-Road Systems into a single operating segment, Westport Operations. This change reflects the manner in which operating decisions and assessing business performance is currently managed by the Chief Operating Decision Makers (the CEO and the COO “CODMs”). As Westport narrows its focus within certain business units, including its investments in joint ventures, and defers certain products and related programs, the CODMs manage the combined businesses as a whole. Therefore, the Westport Operations segment provides more meaningful information to users of Westport’s financial statements. All comparable periods presented have been revised to reflect this change. The financial information for the Company’s business segments evaluated by the CODMs includes the results of CWI and WWI as if they were consolidated, which is consistent with the way Westport manages its business segments. As CWI and WWI are accounted for under the equity method of accounting, an adjustment is reflected in the tables below to reconcile the segment measures to the Company’s consolidated measures. The Company’s business operates in four operating segments: - Westport Operations designs manufactures and sells compressed natural gas, liquefied natural gas, and liquefied petroleum gas components and systems to over 20 global OEMs, and to aftermarket customers in over 60 countries. - Corporate and Technology Investments, which includes corporate costs such as research and development, general and administrative, marketing, interest and other charges, foreign exchange and depreciation that cannot be attributed to a particular segment and are incurred by all segments; - CWI which serves the medium- to heavy-duty engine markets with spark ignited natural gas engines. The fuel for CWI engines is typically carried on vehicles as compressed natural gas or liquefied natural gas; and - WWI develops, manufactures, and sells advanced, alternative fuel engines and parts that are widely used in city bus, coach, and heavy-duty truck applications in China or exported to other regions globally. The accounting policies for the reportable segments are consistent with those described in note 2. The CODM evaluates segment performance based on the net operating income (loss), which is before income taxes and does not include depreciation and amortization, impairment charges, foreign exchange gains and losses, bank charges, interest and other expenses, interest and other income, and gain on sale of long-term investments. The Company did not record any intersegment sales or transfers for the year ended December 31, 2014 and December 31, 2013. Years ended December 31, 2014 2013 2012 Revenue: Westport Operations $ 126,988 $ 151,615 $ 132,382 Corporate and Technology Investments 3,581 12,417 23,244 CWI 337,234 310,651 198,015 WWI 618,465 466,580 272,086 Total segment revenues 1,086,268 941,263 625,727 Less: equity investees' revenue (955,699) (777,231) (470,101) Total consolidated revenues $ 130,569 $ 164,032 $ 155,626 Net consolidated operating income (loss) excluding depreciation and amortization, losses on impairments, write-downs and disposals, provision for inventory purchase commitments, foreign exchange loss (gain), bank charges and other: Westport Operations $ (22,379) $ (67,426) $ (44,770) Corporate and Technology Investments (87,363) (83,546) (50,211) CWI 21,555 23,539 35,368 WWI 78,502 14,496 9,765 Total segment operating loss (9,685) (112,937) (49,848) Less: equity investees’ operating income (100,057) (38,035) (45,133) Net consolidated operating loss excluding depreciation and amortization, losses on impairments, write-downs and disposals, provision for inventory purchase commitments, foreign exchange (gain) loss, bank charges and other: (109,742) (150,972) (94,981) Depreciation and amortization: Westport Operations 13,573 11,474 9,016 Corporate and Technology Investments 5,093 4,814 2,379 Provision for inventory purchase commitments (Westport Operations) 4,106 — — Losses on impairments, write-downs and disposals Corporate and Technology Investments 3,458 31,564 — Westport Operations 26,146 9,959 — 52,376 57,811 11,395 Net consolidated operating loss before foreign exchange (gain) loss, bank charges and other (162,118) (208,783) (106,376) Foreign exchange (gain) loss, bank charges and other (2,731) (14,573) 1,922 Loss from operations (159,387) (194,210) (108,298) Interest on long-term debt and other income (expenses), net (5,032) (3,771) (4,928) Income from investment accounted for by the equity method 14,222 13,444 16,190 Loss before income taxes $ (150,197) $ (184,537) $ (97,036) Years ended December 31, 2014 2013 2012 Total additions to long-lived assets excluding business combinations: Westport Operations $ 2,278 $ 20,871 $ 14,787 Corporate and Technology Investments 7,971 5,579 16,565 $ 10,249 $ 26,450 $ 31,352 % of total product revenue and service and other revenue Years ended December 31, 2014 2013 2012 Americas (including United States) 40 42 38 Asia (including China) 12 11 9 Other (including Italy) 48 47 53 The Company’s revenue earned from Canadian customers is not significant and has been included in revenue from sales in the Americas. As at December 31, 2014, total goodwill of $ 23,352 41,500 As at December 31, 2014, total long-term investments of $ 32,898 21,872 426 256 December 31, 2014 December 31, 2013 Westport Operations $ 219,261 $ 262,690 Corporate and Technology Investments and unallocated assets 118,434 228,981 CWI 172,941 115,343 WWI 182,215 131,146 692,851 738,160 Less: equity investees’ total assets 355,156 246,489 Total consolidated assets $ 337,695 $ 491,671 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, 2014 Fixed Assets Intangible Assets Total (in thousands) (in thousands) (in thousands) Italy 9,084 44,139 53,223 Netherlands 3,729 6,245 9,974 Canada 24,410 673 25,083 United States 20,386 — 20,386 Sweden 208 — 208 China 6,329 — 6,329 Australia 1,018 214 1,232 65,164 51,272 116,436 Less: equity investees' long lived assets 7,030 — 7,030 Total consolidated long-lived assets 58,134 51,272 109,406 December 31, 2013 Fixed Assets Intangible Assets Total (in thousands) (in thousands) (in thousands) Italy 13,819 53,099 66,918 Netherlands — — — Canada 29,842 871 30,713 United States 21,727 25,595 47,322 Sweden 322 — 322 China 8,675 — 8,675 Australia 1,081 279 1,360 75,466 79,844 155,310 Less: equity investees' long lived assets 8,117 — 8,117 Total consolidated long-lived assets 67,349 79,844 147,193

Financial instruments

Financial instruments	12 Months Ended
	Dec. 31, 2014
Financial Instruments Disclosure [Abstract]
Financial Instruments Disclosure [Text Block]	24. Financial instruments: (a) Financial risk management: The Company has exposure to liquidity risk, credit risk, foreign currency risk and interest rate risk. (b) 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 sustained losses and negative cash flows from operations since inception. At December 31, 2014, the Company has $ 94,005 Carrying Contractual amount cash flows < 1 year 1-3 years 4-5 years >5 years Accounts payable and accrued liabilities $ 55,502 $ 55,502 $ 55,502 $ — $ — $ — Unsecured subordinated debentures (1) 46,491 68,613 4,950 63,663 — — Senior financing (2) 15,910 16,565 6,314 8,353 779 1,120 Senior revolving financing (3) 12,101 12,743 315 12,429 — — Other bank financing (4) 2,646 3,135 1,050 478 121 1,485 Capital lease obligations 1,394 1,490 626 665 200 — Operating lease commitments — 57,867 3,946 10,868 9,929 33,125 Royalty payments (5) 1,294 15,927 1,164 2,327 2,327 10,108 $ 135,338 $ 231,842 $ 73,867 $ 98,783 $ 13,356 $ 45,838 (1) Includes interest at 9%. (2) Includes interest at rates disclosed in note 13(b) in effect at December 31, 2014. (3) Includes interest at rates disclosed in note 13(c) in effect at December 31, 2014. (4) Includes interest at rates disclosed in note 13(d) in effect at December 31, 2014. (5) From fiscal 2011 to 2015 inclusive, the Company is obligated to pay annual royalties equal to the greater of $ 1,164 1,350 0.33 12,693 13,500 26,514 28,189 (c) 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 and short-term investments by regularly consulting with its current bank and investment advisors and investing primarily in liquid short-term paper issued by Schedule 1 Canadian banks, R1 rated companies and governments. 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 loans receivable. As at December 31, 2014, 87 88 1 1 12 11 30 90 The carrying amount of cash and cash equivalents, short-term investments and accounts receivable as at December 31, 2014 of $ 140,854 269,919 (d) 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 United States dollar (“U.S.”) and the Euro (“Euro”). 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. U.S. dollars Cash and cash equivalents $ 69,899 Short-term investments 500 Accounts receivable 14,304 Accounts payable 4,012 Euros Cash and cash equivalents € 9,190 Accounts receivable 38,916 Accounts payable 27,667 If foreign exchange rates on December 31, 2014 had changed by 25 basis points, with all other variables held constant, net loss for the year ended December 31, 2014 would have changed by $ 201 51 (e) 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 long-term debt with variable rates of interest. The Company limits its exposure to interest rate risk by 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, 2014 had increased or decreased by 50 basis points, with all other variables held constant, net loss for the year ended December 31, 2014 would have increased or decreased by $ 52 (f) 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 and loan payable approximate their fair values due to the short-term period to maturity of these instruments. The Company’s short-term investments are recorded at fair value. The long-term investment represents our interests in the CWI, WWI and other equity accounted for investees, which are accounted for using the equity method. The carrying value reported in the balance sheets for obligations under capital lease, which is based upon discounted cash flows, approximates its fair value. The carrying value reported in the balance sheet for the unsecured subordinated debenture notes (note 13(a)) approximates its fair value, based on market rates of interest for similar indebtedness. Additionally, the interest rate on the notes approximates the interest rate being demanded in the market for debt with similar terms and conditions. The carrying value reported in the balance sheet for senior financing agreements (note 13(b and c)) approximates their fair values as at December 31, 2014, as the interest rates on the debt is floating and therefore approximates the market rates of interest. The Company’s credit spread also has not substantially changed from the premiums currently paid. 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, 2014, cash and cash equivalents and short-term investments are measured at fair value on a recurring basis and are included in Level 1.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events [Text Block]	25. Subsequent Events Other than the shares issued in connection with the earn-out payments as described in note 15b there were no subsequent events that occurred after the balance sheet date through March 9, 2015, the date when the financial statements were issued.

Significant accounting polici32

Significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	(a) Basis of presentation: The consolidated financial statements include the accounts of the Company, its wholly owned subsidiaries and variable interest entities (“VIEs”) for which the Company is considered the primary beneficiary. 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 of America (“U.S. GAAP”). The Company has sustained net losses over the past several years and as at December 31, 2014 have an accumulated a deficit of $ 765.0 93.3
Foreign Currency Transactions and Translations Policy [Policy Text Block]	(b) Foreign currency translation: The Company’s reporting currency for its consolidated financial statement presentation is the United States dollar. The functional currencies of the Company’s operations and subsidiaries include the following: United States, Canadian and Australian dollar, Euro, Chinese Renminbi (“RMB”), and Swedish Krona. The Company translates assets and liabilities of non-US 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. Transactions that are denominated in currencies other than the functional currency of the Company’s operations or its subsidiaries are translated at the rate 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 rate 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 statement of operations, except for the translation gains and losses arising from available-for-sale instruments, which are recorded through other comprehensive income until realized through disposal or impairment. Except as otherwise noted, all amounts in these financial statements are presented in U.S. dollars. Period end exchange rate as at: Average for the year ended: December 31, 2014 December 31, 2013 December 31, 2014 December 31, 2013 Canadian dollar 0.86 0.94 0.91 0.97 Australian dollar 0.82 0.89 0.90 0.97 Euro 1.21 1.38 1.33 1.33 RMB 0.16 0.17 0.16 0.16 Swedish Krona 0.13 0.16 0.15 0.15
Cash and Cash Equivalents, Policy [Policy Text Block]	(c) Cash and cash equivalents: Cash and cash equivalents includes cash, term deposits, bankers acceptances and guaranteed investment certificates with maturities of ninety days or less when acquired. Cash equivalents are considered as held for trading and recorded at fair value with changes in fair value recognized in the consolidated statements of operations.
Short Term Investments [Policy Text Block]	(d) Short-term investments: Short-term investments, consisting of investment grade commercial paper, banker acceptances, bearer deposit notes, guaranteed investment certificates and other term deposits, are considered available for sale and recorded at fair value with changes in fair value recognized in accumulated other comprehensive income until realized. A decline in value that is considered other than temporary is recognized in net loss for the period.
Receivables, Policy [Policy Text Block]	(e) Account s receivable , net : Accounts receivable are measured at amortized cost. The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments. Management considers the following factors when determining the collectibility of specific customer accounts: customer credit-worthiness, past transaction history with the customer, current economic industry trends, and changes in customer payment terms. Past due balances over 90 days and other higher risk amounts are reviewed individually for collectibility. If the financial condition of the Company’s customers were to deteriorate, adversely affecting their ability to make payments, additional allowances would be required. Based on management’s assessment, the Company provides for estimated uncollectible amounts through a charge to earnings and a credit to a valuation allowance. Balances that remain outstanding after the Company has used reasonable collection efforts are written off through a charge to the valuation allowance and a credit to accounts receivable.
Inventory, Policy [Policy Text Block]	(f) 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. Cost is determined based on the lower of weighted average 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.
Property, Plant and Equipment, Policy [Policy Text Block]	(g) Property, plant and equipment: Assets Basis Rate Buildings Straight-line 15 years Computer equipment and software Straight-line 3 years Furniture and fixtures Straight-line 5 years Machinery and equipment Straight-line 8 – 10 years Leasehold improvements Straight-line Lease term
Long Term Investments [Policy Text Block]	(h) Long-term investments: The Company accounts for investments in which it has significant influence, including VIEs for which the Company is not the primary beneficiary, using the equity basis 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 [Policy Text Block]	(i) Financial liabilities: Accounts payable and accrued liabilities, short-term debt and long-term debt are measured at amortized cost. Transaction costs relating to long-term debt are deferred in other assets on initial recognition and are amortized using the effective interest rate method.
Research and Development Expense, Policy [Policy Text Block]	(j) Research and development costs: Research and development costs are expensed as incurred and are recorded net of government funding received or receivable.
Government Assistance [Policy Text Block]	(k) Government assistance: The Company periodically applies for financial assistance under available government incentive programs, which is recorded in the period it is received or receivable. Government assistance relating to the purchase of property, plant and equipment is reflected as a reduction of the cost of such assets. Government assistance related to research and development activities is recorded as a reduction of the related expenditures.
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	(l) Intangible assets: Intangible assets consist primarily of the cost of intellectual property, trademarks, technology, customer contracts and non-compete agreements. Intangible assets are amortized over their estimated useful lives, which range from 5 20
Asset Retirement Obligations, Policy [Policy Text Block]	(m) 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 and Intangible Assets, Policy [Policy Text Block]	(n) Goodwill impairment: 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. 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 November 30. 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. A two-step test is used to identify a potential impairment and to measure the amount of impairment, if any. The first step is to compare the fair value of the reporting unit with its carrying amount, including goodwill. If the fair value of the reporting unit exceeds its carrying amount, goodwill is considered not impaired; otherwise, goodwill is impaired and the loss is measured by performing step two. Under step two, the impairment loss is measured by comparing the implied fair value of the reporting unit goodwill with the carrying amount of goodwill. Fair value is determined using widely accepted valuation techniques, which may include discounted cash flows and market multiple analyses. These types of analyses contain uncertainties because they require management to make assumptions and to apply judgment to estimate industry economic factors and the profitability of future business strategies.
Standard Product Warranty, Policy [Policy Text Block]	(o) 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 for a period ending two years 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 cost 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 upon shipment using a factor based upon historical experience from previous engine 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. Since a number of the Company’s products are new in the market, historical data may not necessarily reflect actual costs to be incurred and may result in significant fluctuations in the warranty liability.
Extended Product Warranty, Policy [Policy Text Block]	(p) Extended warranty: The Company sells extended warranty contracts that provide coverage in addition to the basic warranty coverage. Proceeds from the sale of these contracts are deferred and amortized over the extended warranty period commencing at the end of the basic warranty period. On a periodic basis, management reviews the estimated costs expected to be incurred related to servicing these contracts and recognizes a loss to the extent such costs exceed the related deferred revenue. Extended warranty costs are expensed as period costs as incurred.
Revenue Recognition, Policy [Policy Text Block]	(q) Revenue recognition: Product revenue The Company’s primary source of revenue is from the sale of kits, Westport LNG systems and parts, and Westport CNG and LPG fuel systems for OEMs in the light-duty automotive and industrial markets. Product revenue is recognized when contractual terms are agreed upon, the price is fixed or determinable, the products are shipped and title passes to the customer and collectability is reasonably assured. Revenue from research and development The Company also earns service revenue from research and development arrangements under which the Company provides contract services relating to developing natural gas engines or biogas engines for use in products and providing ongoing development services to assist with the development and commercialization of products. These contracts provide for the payment for services based on our achieving defined milestones or on the performance of work under product development programs. Revenues are recognized using the milestone method based on assessment of progress achieved against the defined milestones. Revenue may also be recognized using the proportionate performance method of accounting based on the performance of work under the research and development arrangement. There is a risk that a customer may ultimately disagree with our assessment of the progress achieved against milestones or that our estimates of the percentage of work completed could change. Should this occur, the revenues recognized in the period might require adjustment in a subsequent period. All costs incurred related to revenue earned from research and development arrangements are recorded as research and development expense as incurred. Revenue from contracts The Company earns revenue under certain contracts to provide engineering development services. These contracts provide for the payment for services based on the performance of work under product development programs. Revenues are recognized under these contracts based on the percentage of completion method of accounting. The components to measure percentage of completion are complex and subject to many variables. Components may include estimated costs to complete a contract, estimated hours to completion or management’s assessment of work to be performed. When estimates of total costs to be incurred on a contract exceed total estimates of revenue to be earned, a provision for the entire loss on the contract is recorded in the period the loss is determined. There is a risk that the estimated percentage of completion of a contract may change, which may result in an adjustment to previously recognized revenues. All costs incurred related to revenue earned from contracts are recorded in cost of products sold. Arrangements with customers may include multiple deliverables, including any combination of products, services, and licenses. In these arrangements, the Company allocates revenue to all deliverables based on their relative selling prices. The Company uses a hierarchy to determine the selling price to be used for allocating revenue to deliverables: (a) vendor-specific objective evidence of fair value (VSOE), (b) third-party evidence of selling price (TPE), and (c) best estimate of selling price (BESP), which are determined as follows: VSOE-In limited circumstances are products sold separately in stand-alone arrangements. In determining VSOE, the Company requires that a substantial majority of the selling prices for a product or service falls within a reasonably narrow pricing range, generally evidenced by the pricing rates of approximately 85% of such historical stand-alone transactions falling within plus or minus 10% of the median rate. TPE-VSOE exists only when the Company sells the deliverable separately. When VSOE does not exist, the Company attempts to determine TPE based on competitor prices for similar deliverables when sold separately. Generally, the Company’s go-to-market strategy for many of its products differs from that of its peers and its offerings contain a significant level of customization and differentiation such that the comparable pricing of products with similar functionality sold by other companies cannot be obtained. Furthermore, the Company is unable to reliably determine what similar competitor products’ selling prices are on a stand-alone basis. Therefore, the Company is typically not able to determine TPE. BESP-The objective of BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. When both VSOE and TPE do not exist, the Company determines BESP by first collecting all reasonably available data points including sales, cost and margin analysis of the product, and other inputs based on the Company’s normal pricing practices. Second, the Company makes any reasonably required adjustments to the data based on market and Company-specific factors. Third, the Company stratifies the data points, when appropriate, based on customer, magnitude of the transaction and sales volume. Once elements of an arrangement are separated into more than one unit of accounting, revenue is recognized for each separate unit of accounting based on the nature of the revenue as described above. Changes in cost estimates and the fair values of certain deliverables could negatively impact the Company’s operating results. In addition, unforeseen conditions could arise over the contract term that may have a significant impact on the Company’s operating results. License revenue Revenue from technology license fees is recognized over the duration of the licensing agreement. Amounts received in advance of the revenue recognition criteria being met are recorded as deferred revenue.
Income Tax, Policy [Policy Text Block]	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 the 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. 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.

Significant accounting polici33

Significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule Of Foreign Currency Exchange Rate Translation [Table Text Block]	For the periods presented, the Company used the following exchange rates: Period end exchange rate as at: Average for the year ended: December 31, 2014 December 31, 2013 December 31, 2014 December 31, 2013 Canadian dollar 0.86 0.94 0.91 0.97 Australian dollar 0.82 0.89 0.90 0.97 Euro 1.21 1.38 1.33 1.33 RMB 0.16 0.17 0.16 0.16 Swedish Krona 0.13 0.16 0.15 0.15
Schedule of Property Plant and Equipment Components [Table Text Block]	Property, plant and equipment are stated at cost. Depreciation is provided as follows: Assets Basis Rate Buildings Straight-line 15 years Computer equipment and software Straight-line 3 years Furniture and fixtures Straight-line 5 years Machinery and equipment Straight-line 8 – 10 years Leasehold improvements Straight-line Lease term

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2014
Prins Autogassystemen Holding B.V. [Member]
Schedule Of Purchase Price Allocations [Table Text Block]	The estimated fair values of assets acquired and liabilities assumed are provisional and are based on the information that was available as of the acquisition date to estimate the fair value of assets acquired and liabilities assumed. The Company believes that information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed, but the Company is waiting for additional information necessary to finalize those fair values. Therefore, the provisional measurements of fair value reflected are subject to change and such changes could be significant. The Company expects to finalize the valuation and complete the purchase price allocation as soon as practicable but no later than one year from the acquisition date. Consideration allocated to: Other tangible assets, including cash of $61 $ 13,138 Property, plant and equipment 3,824 Intangible assets subject to amortization over 5 years 3,024 Goodwill 3,221 Total assets acquired $ 23,207 Less: Current liabilities 7,211 Deferred income tax liabilities 979 Debt assumed (note 13b and c) 11,905 $ 20,095 Total net assets acquired $ 3,112 Consideration: Paid to sellers $ 3,112
Business Acquisition, Pro Forma Information [Table Text Block]	Years ended December 31, 2014 2013 Revenue Revenue for the period $ 130,569 $ 164,032 Add: BAF - see (note 4(b)) — 7,249 Add: Prins 30,993 30,885 Pro forma revenue for the period $ 161,562 $ 202,166 Net Loss Net loss for the period $ (149,618) $ (185,410) Add: BAF - see (note 4(b)) (4,038) Add: Prins 91 9,164 Pro forma net loss for the period $ (149,527) $ (180,284)
BAF Technologies Inc [Member]
Schedule Of Purchase Price Allocations [Table Text Block]	Consideration allocated to: Other tangible assets, including cash of $1,178 $ 9,116 Property, plant and equipment 905 Intangible assets subject to amortization over 3 to 10 years 7,729 Goodwill 18,542 Total assets acquired 36,292 Less: total liabilities (6,594) Total net assets acquired $ 29,698 Consideration: Payable to Clean Energy $ 2,322 Common shares issued 24,091 Common shares to be issued 3,285 $ 29,698
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]	Weighted average Assigned fair value amortization period Customer relationships $ 6,350 8 years Core technology 160 10 years Other intangibles 1,219 3 years Total $ 7,729 7 years
Business Acquisition, Pro Forma Information [Table Text Block]	Years ended December 31, 2013 2012 Revenue $ 171,281 $ 181,972 Net loss $ (189,448) $ (100,946)

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	December 31, 2014 December 31, 2013 Customer trade receivable $ 43,256 $ 54,017 Government funding receivable 38 483 Due from joint venture (note 20) 2,538 3,621 Other receivables 3,269 2,689 Income tax receivable 499 77 Allowance for doubtful accounts (2,751) (1,572) $ 46,849 $ 59,315

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of Inventory, Current [Table Text Block]	December 31, 2014 December 31, 2013 Purchased parts $ 28,227 $ 23,228 Work-in-process 4,879 10,770 Finished goods 8,718 6,628 $ 41,824 $ 40,626

Long-term investments (Tables)

Long-term investments (Tables)	12 Months Ended
	Dec. 31, 2014
Long Term Investment [Table Text Block]	December 31, 2014 December 31, 2013 Weichai Westport Inc. (a) $ 18,791 $ 14,534 Cummins Westport Inc. (b) 13,196 7,191 Other equity accounted for investees 1,337 403 $ 33,324 $ 22,128
Weichai Westport Inc. [Member]
Schedule of Equity Method Investments [Table Text Block]	Assets, liabilities, revenue and expenses of WWI as of and for the periods presented are as follows: December 31, December 31, 2014 2013 Current assets: Cash and short-term investments $ 11,734 $ 4,696 Accounts receivable 72,121 31,967 Inventory 83,594 80,412 Other current assets 1,249 176 Long-term assets Property, plant and equipment 5,736 7,021 Deferred income tax assets 7,781 6,874 Total assets $ 182,215 $ 131,146 Current liabilities: Accounts payable and accrued liabilities $ 128,838 $ 93,016 Total liabilities $ 128,838 $ 93,016 Years ended December 31, 2014 2013 2012 Product revenue $ 618,465 $ 466,580 $ 272,086 Cost of revenue and expenses: Cost of product revenue 565,943 429,238 247,299 Operating expenses 32,227 22,846 15,022 598,170 452,084 262,321 Income before income taxes 20,295 14,496 9,765 Income tax expense 3,076 2,315 1,536 Income for the period $ 17,219 $ 12,181 $ 8,229
Cummins Westport, Inc. [Member]
Schedule of Equity Method Investments [Table Text Block]	Assets, liabilities, revenue and expenses of CWI are as follows: December 31, 2014 December 31, 2013 Current assets: Cash and short-term investments $ 107,415 $ 73,736 Accounts receivable 12,741 4,645 Current portion of deferred income tax assets 21,967 13,958 Other current assets 116 210 Long-term assets: Property, plant and equipment 1,294 1,096 Deferred income tax assets 29,408 21,698 Total assets $ 172,941 $ 115,343 Current liabilities: Current portion of warranty liability $ 48,818 $ 18,395 Current portion of deferred revenue 8,029 5,478 Accounts payable and accrued liabilities 6,419 7,772 63,266 31,645 Long-term liabilities: Warranty liability 43,983 49,174 Deferred revenue 34,345 17,815 Other long-term liabilities 2,771 2,400 81,099 69,389 Total liabilities $ 144,365 $ 101,034 Years ended December 31, 2014 2013 2012 Product revenue $ 283,551 $ 261,012 $ 161,741 Parts revenue 53,683 49,639 36,274 337,234 310,651 198,015 Cost of revenue and expenses: Cost of product and parts revenue 270,832 246,403 136,575 Research and development 21,131 21,522 12,114 General and administrative 1,202 1,348 1,417 Sales and marketing 22,514 17,839 12,541 Foreign exchange (gain) loss 34 (7) (18) Bank charges, interest and other 805 607 472 316,518 287,712 163,101 Income from operations 20,716 22,939 34,914 Interest and investment income 260 117 530 Income before income taxes 20,976 23,056 35,444 Income tax expense (recovery): Current 21,514 24,600 16,362 Deferred (15,719) (18,566) (6,517) 5,795 6,034 9,845 Income for the period $ 15,181 $ 17,022 $ 25,599

Variable interest entities (Tab

Variable interest entities (Tables)	12 Months Ended
	Dec. 31, 2014
Variable Interest Entities [Abstract]
Schedule of Variable Interest Entities [Table Text Block]	The carrying amount and maximum exposure to losses relating to VIEs in which the Company holds a significant variable interest but is not the primary beneficiary, and which have not been consolidated, were as follows: Balance at December 31, 2014 Balance at December 31, 2013 Carrying Maximum Carrying Maximum Equity method investment $ 13,196 $ 13,196 $ 7,191 $ 7,191 Accounts receivable 2,538 2,538 3,621 3,621

Property, plant and equipment (

Property, plant and equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]	Accumulated Net book December 31, 2014 Cost depreciation value Land and buildings $ 3,015 $ — $ 3,015 Computer equipment and software 9,277 7,063 2,214 Furniture and fixtures 6,194 1,798 4,396 Machinery and equipment 81,933 36,135 45,798 Leasehold improvements 12,460 9,749 2,711 $ 112,879 $ 54,745 $ 58,134 Accumulated Net book December 31, 2013 Cost depreciation value Computer equipment and software $ 9,652 $ 6,174 $ 3,478 Furniture and fixtures 6,608 1,692 4,916 Machinery and equipment 86,067 32,099 53,968 Leasehold improvements 15,084 10,097 4,987 $ 117,411 $ 50,062 $ 67,349

Intangible assets (Tables)

Intangible assets (Tables)	12 Months Ended
	Dec. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Schedule of Finite-Lived Intangible Assets [Table Text Block]	Accumulated Net book December 31, 2014 Cost amortization value Patents and trademarks $ 18,425 $ 3,445 $ 14,980 Technology (1) 6,449 3,142 3,307 Customer contracts (1) 13,762 4,163 9,599 Other intangibles (1) 62 28 34 Total $ 38,698 $ 10,778 $ 27,920 Accumulated Net book December 31, 2013 Cost amortization value Patents and trademarks $ 20,974 $ 2,900 $ 18,074 Technology 7,468 2,796 4,672 Customer contracts (2) 18,447 3,886 14,561 Other intangibles 1,262 225 1,037 Total $ 48,151 $ 9,807 $ 38,344 (1) The Company reviews its long-lived assets for impairment including property, plant and equipment, and intangible assets whenever events and changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Based on the revenue and operating results and decline in the oil price, the Company concluded there were impairment indicators requiring the performance of a long-lived assets impairment test for customer contracts, technology and other intangibles as of November 30, 2014. Accordingly non-cash impairment charges aggregating to $ 5,823 115 4,705 1,003 (2) During the year ended December 31, 2013, there was a significant decline in revenue from the lower than expected adoption rate of natural gas vehicles in our customer contracts. An impairment analysis of the intangibles balance indicated that the carrying value exceeded the fair value of customer contracts. Accordingly, an intangible impairment charge of $ 1,721

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	A continuity of goodwill is as follows: December 31, 2014 December 31, 2013 Balance, beginning of period: $ 41,500 $ 56,879 Acquisition of Prins (note 4(a)) 3,221 — Acquisition of BAF (note 4(b)) — 18,542 Impairment losses (18,543) (34,964) Impact of foreign exchange changes (2,826) 1,043 Balance, end of period $ 23,352 $ 41,500

Accounts payable and accrued 42

Accounts payable and accrued liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Accounts Payable and Accrued Liabilities, Current [Abstract]
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]	December 31, 2014 December 31, 2013 Trade accounts payable $ 41,796 $ 42,872 Accrued payroll 5,270 7,937 Accrued interest 1,237 893 Income taxes payable 580 709 Other payables (note 22b) 6,619 2,381 $ 55,502 $ 54,792

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2014
Schedule of Long-term Debt Instruments [Table Text Block]	December 31, 2014 December 31, 2013 Subordinated debenture notes (a) $ 46,491 $ 33,847 Senior financing (b) 15,910 15,941 Senior revolving financing (c) 12,101 13,779 Other bank financing (d) 2,646 403 Capital lease obligations (e) 1,394 2,043 78,542 66,013 Current portion (18,955) (53,025) $ 59,587 $ 12,988 (a) On September 23, 2011, the Company raised $ 33,720 36,000 9 The Initial Debentures were redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount of the debentures on or before March 22, 2013 On June 27, 2014, the Company raised $ 17,797 19,000 pari passu terms. The New Debentures totaling $ 51,517 55,000 33,720 36,000 September 15, 2017 Debentures are redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount debentures can be redeemed at a price equal to $1,100 per $1,000 principal amount. The New Debentures contain an extension option that will allow each debenture holder to have the option to extend, a maximum of six times 10,000 The Company has performed the assessment of embedded derivatives within the New Debentures and concluded that there is an embedded derivative that requires bifurcation related to the extension option from the New Debentures. The extension option was deemed not clearly and closely related to the New Debentures and is separately accounted for as a standalone derivative. The Company recorded this embedded derivative as a non-current liability on its consolidated balance sheet. At issuance on June 27, 2014, the embedded derivative’s fair value was determined to be $ 1,169 1,249 82 (1,082) (b) December 31, 2014 December 31, 2013 Emer Senior Financing (1) $ 9,376 $ 15,941 Prins Senior Financing (2) 3,630 — Prins Senior Mortgage Loan (3) 2,904 — $ 15,910 $ 15,941 (1) The Emer S.p.A (“Emer”) senior financing agreement bears interest at the 6-month Euribor 2.5 2.7 (2) A total of $7,521 Prins senior financing was assumed on the acquisition of Prins (note 4a). Principal of $ 3,891 3-month Euribor 3.5 3.6 (3) The Prins senior mortgage loan was assumed on the acquisition of Prins (note 4a). The senior mortgage loan bears interest at 3-month Euribor 1 1.1 Emer Senior Prins Senior Prins Senior Financing Financing Mortgage Loan Total 2015 $ 4,020 $ 1,633 $ 363 $ 6,016 2016 4,239 1,997 363 6,599 2017 1,117 — 363 1,480 2018 — — 363 363 2019 and thereafter — — 1,452 1,452 $ 9,376 $ 3,630 $ 2,904 $ 15,910 (c) The senior revolving financing facility bears interest at the 6-month Euribor 2.5 6,050 5,000 Throughout the entire term of these financing arrangements, the Company is required to meet certain financial and non-financial covenants. As of December 31, 2014, the Company is in compliance with all covenants under the financing arrangements. (d) December 31, 2014 December 31, 2013 Emer other financing (1) $ 1,129 $ 247 Prins other financing (2) 1,424 — Other financing 93 156 $ 2,646 $ 403 (1) Emer other financing consists of various unsecured bank financing arrangements that carry rates of interest ranging from 1.01 2.90 1.01 8.00 (2) Prins other bank financing consists of a credit facility for maximum borrowings of € 2,000 3 month Euribor 3.5 60 (e) The Company has capital lease obligations that have initial terms of three to five years at interest rates ranging from 3.07 4.93 3.07 7.32 2015 $ 522 2016 328 2017 327 2018 191 2019 26 $ 1,394
Schedule of Maturities of Long-term Debt [Table Text Block]	The principal repayment schedule of the senior financings are as follows for the years ended December 31: Emer Senior Prins Senior Prins Senior Financing Financing Mortgage Loan Total 2015 $ 4,020 $ 1,633 $ 363 $ 6,016 2016 4,239 1,997 363 6,599 2017 1,117 — 363 1,480 2018 — — 363 363 2019 and thereafter — — 1,452 1,452 $ 9,376 $ 3,630 $ 2,904 $ 15,910
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]	The capital lease obligations require the following minimum annual principal payments during the respective fiscal years: 2015 $ 522 2016 328 2017 327 2018 191 2019 26 $ 1,394
Senior Financing [Member]
Schedule of Long-term Debt Instruments [Table Text Block]	December 31, 2014 December 31, 2013 Emer Senior Financing (1) $ 9,376 $ 15,941 Prins Senior Financing (2) 3,630 — Prins Senior Mortgage Loan (3) 2,904 — $ 15,910 $ 15,941 (1) The Emer S.p.A (“Emer”) senior financing agreement bears interest at the 6-month Euribor 2.5 2.7 (2) A total of $7,521 Prins senior financing was assumed on the acquisition of Prins (note 4a). Principal of $ 3,891 3-month Euribor 3.5 3.6 (3) The Prins senior mortgage loan was assumed on the acquisition of Prins (note 4a). The senior mortgage loan bears interest at 3-month Euribor 1 1.1
Other Bank Financing [Member]
Schedule of Long-term Debt Instruments [Table Text Block]	December 31, 2014 December 31, 2013 Emer other financing (1) $ 1,129 $ 247 Prins other financing (2) 1,424 — Other financing 93 156 $ 2,646 $ 403 (1) Emer other financing consists of various unsecured bank financing arrangements that carry rates of interest ranging from 1.01 2.90 1.01 8.00 (2) Prins other bank financing consists of a credit facility for maximum borrowings of € 2,000 3 month Euribor 3.5 60

Warranty liability (Tables)

Warranty liability (Tables)	12 Months Ended
	Dec. 31, 2014
Product Warranties Disclosures [Abstract]
Schedule of Product Warranty Liability [Table Text Block]	A continuity of the warranty liability is as follows: Years ended December 31, 2014 2013 2012 Balance, beginning of period $ 28,845 $ 6,380 $ 4,401 Warranty assumed on acquisition 1,952 582 — Warranty claims (10,709) (5,397) (3,099) Warranty accruals 2,734 4,153 5,303 Change in estimate — 22,837 — Impact of foreign exchange changes 287 290 (225) Balance, end of period $ 23,109 $ 28,845 $ 6,380 Less: Current portion (9,696) (9,955) (2,072) Long-term portion $ 13,413 $ 18,890 $ 4,308

Other long-term liabilities (Ta

Other long-term liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Other Liabilities Disclosure [Abstract]
Schedule of Other Long Term Liabilities [Table Text Block]	December 31, December 31, 2014 2013 Severance indemnity (a) $ 1,519 $ 1,547 Contingent consideration payable related to AFV acquisition (b) 1,240 878 Derivative Liability (note 13a) 86 — Deferred lease inducements — 16 $ 2,845 $ 2,441 Current portion (included in accounts payable and accrued liabilities, other payables) (1,240) — $ 1,605 $ 2,441 (a) Italian law requires companies to make a mandatory termination payment to employees. It is paid, as a lump sum, when the employment ends for any reason such as retirement, resignation or layoff. The severance indemnity liability is calculated in accordance with local civil and labour laws based on each employee’s length of service, employment category and remuneration. There is no vesting period or funding requirement associated with the liability. The liability recorded in the consolidated balance sheet is the amount that the employee would be entitled to if the employee terminates immediately. This liability for severance indemnities relates primarily to the Company’s employees in Italy. (b) The total purchase price to acquire AFV also includes earn-out payments payable in the Company’s shares and tied to revenue and production milestones to be achieved no later than December 31, 2014. This contingent consideration has a fair value of $ 407 427

Share capital, stock options 46

Share capital, stock options and other stock-based plans (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	A summary of the status of the Company’s stock option plan as of December 31, 2014, December 31, 2013 and December 31, 2012 and changes during the periods then ended are presented as follows: December 31, 2014 December 31, 2013 December 31, 2012 Weighted Weighted Weighted average average average exercise exercise exercise Number of price Number of price Number of price shares (CDN $) shares (CDN $) shares (CDN $) Outstanding , beginning of period 816,450 $ 30.20 996,047 $ 27.78 328,027 $ 8.96 Granted — — — — 770,727 33.77 Exercised (43,071) 6.17 (111,986) 6.80 (93,044) 10.49 Forfeited/expired (741,156) 33.82 (67,611) 33.72 (9,663) 33.36 Outstanding, end of period 32,223 $ 17.64 816,450 $ 30.20 996,047 $ 27.78 Options exercisable, end of period 32,223 $ 17.64 305,506 $ 24.15 226,487 $ 8.06
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Intrinsic Value [Table Text Block]	The aggregate intrinsic value of the Company’s stock option awards and share units at December 31, 2014 and 2013 are as follows: December 31, December 31, 2014 2013 CDN$ CDN$ Stock options: Outstanding $ — $ 1,337 Exercisable — 1,337 Exercised 364 2,667 Share units: Outstanding $ 23,433 $ 24,960 Exercisable 624 4,670 Exercised 7,238 18,041
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	Stock-based compensation associated with the Unit plans and the stock option plan is included in operating expenses as follows: Years ended December 31, 2014 2013 2012 Research and development $ 1,749 $ 2,195 $ 2,251 General and administrative 5,884 10,201 6,752 Sales and marketing 2,050 1,887 3,465 $ 9,683 $ 14,283 $ 12,468
Westport Omnibus Plan and the former Amended and Restated Unit Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	A continuity of the Units issued under the Westport Omnibus Plan and the former Amended and Restated Unit Plan as of December 31, 2014, December 31, 2013 and December 31, 2012 are as follows: December 31, 2014 December 31, 2013 December 31, 2012 Weighted Weighted Weighted average average average grant grant grant date fair date fair date fair Number of value Number of value Number of value units (CDN $) units (CDN $) units (CDN $) Outstanding, beginning of period 1,200,591 $ 23.68 1,095,094 $ 20.68 1,250,917 $ 18.04 Granted 5,792,162 10.54 742,140 30.21 185,705 35.99 Exercised/Vested (608,975) 19.52 (448,526) 24.44 (337,228) 19.34 Forfeited/expired (1,045,905) 21.75 (188,117) 29.80 (4,300) 19.67 Outstanding, end of period 5,337,873 $ 10.27 1,200,591 $ 23.68 1,095,094 $ 20.68 Units outstanding and exercisable, end of period 142,166 $ 11.67 224,638 $ 11.20 262,615 $ 8.86

Research and development expe47

Research and development expenses (Tables)	12 Months Ended
	Dec. 31, 2014
Research and Development [Abstract]
Research and Development Expense [Table Text Block]	The research and development expenses had been incurred and program funding had been received or receivable are as follows: Years ended December 31, 2014 2013 2012 Research and development expenses $ 77,472 $ 91,772 $ 74,040 Government assistance (note 16) (892) (640) (842) Research and development $ 76,580 $ 91,132 $ 73,198

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	(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 26 26 25 Years ended December 31, 2014 2013 2012 Loss before income taxes $ (150,197) $ (184,537) $ (97,036) Expected income tax recovery (39,051) (47,979) (24,259) Increase (reduction) in income taxes resulting from: Non-deductible stock-based compensation 2,495 3,619 3,019 Other permanent differences (446) (2,562) (2,158) Withholding taxes 969 590 1,187 Change in enacted rates — — 62 Foreign tax rate differences, foreign exchange and other adjustments 7,409 3,858 (382) Non-taxable income from equity investment (3,739) (2,851) (3,308) Change in valuation allowance 25,784 37,391 27,577 Goodwill impairment 4,748 8,807 — Change in uncertain tax position 1,252 — — Income tax expense (recovery) $ (579) $ 873 $ 1,738
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	(b) The significant components of the deferred income tax assets and liabilities are as follows: December 31, 2014 December 31, 2013 Deferred income tax assets: Net loss carry forwards $ 129,258 $ 108,083 Intangible assets 4,091 4,276 Property, plant and equipment 6,836 5,446 Financing and share issuance costs 1,533 2,696 Warranty liability 5,131 5,726 Deferred revenue 1,416 1,191 Inventory 2,336 2,017 Research and development 2,733 2,341 Other 7,262 6,410 Total gross deferred income tax assets 160,596 138,186 Valuation allowance (152,207) (126,424) Total deferred income tax assets 8,389 11,762 Deferred income tax liabilities: Intangible assets 6,386 9,884 Property, plant and equipment 2,754 3,132 Other 774 650 Total deferred income tax liabilities 9,914 13,666 Total net deferred income tax liabilities $ 1,525 $ 1,904 Allocated as follows: Current deferred income tax assets 3,556 3,109 Current deferred income tax liabilities (398) (468) Long-term deferred income tax assets 271 379 Long-term deferred income tax liabilities (4,954) (4,903) Total net deferred income tax liabilities $ (1,525) $ (1,883)
Summary of Valuation Allowance [Table Text Block]	The following is a summary of the changes in the deferred income tax asset valuation allowance: Year ended Year ended December 31, 2014 December 31, 2013 Beginning balance $ 126,424 $ 89,033 Additions 25,783 37,391 Reductions — — Ending valuation allowance $ 152,207 $ 126,424
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	(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, 2014: Canada $ (87,783) 165 301 $ 466 United States (49,577) 8 — 8 Italy (3,834) 521 (1,463) (942) Other (9,003) (88) (23) (111) $ (150,197) $ 606 $ (1,185) $ (579) Year ended December 31, 2013: Canada $ (99,188) $ 444 $ 89 $ 533 United States (31,019) 56 (295) (239) Italy (27,247) 836 (311) 525 Other (27,083) 78 (24) 54 $ (184,537) $ 1,414 $ (541) $ 873 Year ended December 31, 2012: Canada $ (93,688) $ 1,339 $ 53 $ 1,392 United States (1,589) (62) — (62) Italy (318) 775 25 800 Other (1,441) 95 (487) (392) $ (97,036) $ 2,147 $ (409) $ 1,738
Summary of Operating Loss Carryforwards [Table Text Block]	The Company has loss carry-forwards in the various tax jurisdictions available to offset future taxable income as follows: Expiring in: 2015 2016 2017 2018 2019 2020 and later Total Canada $ — $ — $ — $ — $ — $ 387,553,717 $ 387,553,717 Italy — — — — — 6,429,576 6,429,576 United States — — — — — 55,353,513 55,353,513 Sweden — — — — — 13,710,864 13,710,864 Other — — — 1,085,596 6,725,731 7,834,119 15,645,446 Total $ — $ — $ — $ 1,085,596 $ 6,725,731 $ 470,881,789 $ 478,693,116
Summary of Income Tax Contingencies [Table Text Block]	A reconciliation of the change in the reserves for uncertain tax positions from January 1, 2014 to December 31, 2014 is as follows: Balance as of January 1, 2014 $ — Tax positions related to the current year: Additions — Reductions — $ — Tax positions related to prior years: Additions 1,230 Reductions — Settlements — Lapses in statutes of limitations — Balance as of December 31, 2014 $ 1,230

Related party transactions (Tab

Related party transactions (Tables)	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Schedule of Related Party Transactions [Table Text Block]	Cost reimbursements from CWI consisted of the following: Years ended December 31, 2014 2013 2012 Research and development $ 3 $ 178 $ 160 General and administrative 1,548 1,351 2,621 Sales and marketing 4,935 4,725 3,683 $ 6,486 $ 6,254 $ 6,464

Commitments and contingencies (

Commitments and contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	The Company has obligations under operating lease arrangements that require the following minimum annual payments during the respective fiscal years: 2015 $ 3,946 2016 4,978 2017 5,890 2018 4,969 2019 4,960 Thereafter 33,125 $ 57,868

Segmented information (Tables)

Segmented information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information [Table Text Block]	Years ended December 31, 2014 2013 2012 Revenue: Westport Operations $ 126,988 $ 151,615 $ 132,382 Corporate and Technology Investments 3,581 12,417 23,244 CWI 337,234 310,651 198,015 WWI 618,465 466,580 272,086 Total segment revenues 1,086,268 941,263 625,727 Less: equity investees' revenue (955,699) (777,231) (470,101) Total consolidated revenues $ 130,569 $ 164,032 $ 155,626 Net consolidated operating income (loss) excluding depreciation and amortization, losses on impairments, write-downs and disposals, provision for inventory purchase commitments, foreign exchange loss (gain), bank charges and other: Westport Operations $ (22,379) $ (67,426) $ (44,770) Corporate and Technology Investments (87,363) (83,546) (50,211) CWI 21,555 23,539 35,368 WWI 78,502 14,496 9,765 Total segment operating loss (9,685) (112,937) (49,848) Less: equity investees’ operating income (100,057) (38,035) (45,133) Net consolidated operating loss excluding depreciation and amortization, losses on impairments, write-downs and disposals, provision for inventory purchase commitments, foreign exchange (gain) loss, bank charges and other: (109,742) (150,972) (94,981) Depreciation and amortization: Westport Operations 13,573 11,474 9,016 Corporate and Technology Investments 5,093 4,814 2,379 Provision for inventory purchase commitments (Westport Operations) 4,106 — — Losses on impairments, write-downs and disposals Corporate and Technology Investments 3,458 31,564 — Westport Operations 26,146 9,959 — 52,376 57,811 11,395 Net consolidated operating loss before foreign exchange (gain) loss, bank charges and other (162,118) (208,783) (106,376) Foreign exchange (gain) loss, bank charges and other (2,731) (14,573) 1,922 Loss from operations (159,387) (194,210) (108,298) Interest on long-term debt and other income (expenses), net (5,032) (3,771) (4,928) Income from investment accounted for by the equity method 14,222 13,444 16,190 Loss before income taxes $ (150,197) $ (184,537) $ (97,036)
Schedule of Assets by Segment [Table Text Block]	Years ended December 31, 2014 2013 2012 Total additions to long-lived assets excluding business combinations: Westport Operations $ 2,278 $ 20,871 $ 14,787 Corporate and Technology Investments 7,971 5,579 16,565 $ 10,249 $ 26,450 $ 31,352
Schedule Of Geographical Revenue Information [Table Text Block]	It is impracticable for the Company to provide geographical revenue information by individual countries; however, it is practicable to provide it by geographical regions. Product and service and other revenues are attributable to geographical regions based on location of the Company’s customers and presented as a percentage of the Company’s product and service revenues are as follows: % of total product revenue and service and other revenue Years ended December 31, 2014 2013 2012 Americas (including United States) 40 42 38 Asia (including China) 12 11 9 Other (including Italy) 48 47 53
Schedule Of Allocation Of The Total Assets [Table Text Block]	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, 2014 Fixed Assets Intangible Assets Total (in thousands) (in thousands) (in thousands) Italy 9,084 44,139 53,223 Netherlands 3,729 6,245 9,974 Canada 24,410 673 25,083 United States 20,386 — 20,386 Sweden 208 — 208 China 6,329 — 6,329 Australia 1,018 214 1,232 65,164 51,272 116,436 Less: equity investees' long lived assets 7,030 — 7,030 Total consolidated long-lived assets 58,134 51,272 109,406 December 31, 2013 Fixed Assets Intangible Assets Total (in thousands) (in thousands) (in thousands) Italy 13,819 53,099 66,918 Netherlands — — — Canada 29,842 871 30,713 United States 21,727 25,595 47,322 Sweden 322 — 322 China 8,675 — 8,675 Australia 1,081 279 1,360 75,466 79,844 155,310 Less: equity investees' long lived assets 8,117 — 8,117 Total consolidated long-lived assets 67,349 79,844 147,193

Financial instruments (Tables)

Financial instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Financial Instruments Disclosure [Abstract]
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]	Carrying Contractual amount cash flows < 1 year 1-3 years 4-5 years >5 years Accounts payable and accrued liabilities $ 55,502 $ 55,502 $ 55,502 $ — $ — $ — Unsecured subordinated debentures (1) 46,491 68,613 4,950 63,663 — — Senior financing (2) 15,910 16,565 6,314 8,353 779 1,120 Senior revolving financing (3) 12,101 12,743 315 12,429 — — Other bank financing (4) 2,646 3,135 1,050 478 121 1,485 Capital lease obligations 1,394 1,490 626 665 200 — Operating lease commitments — 57,867 3,946 10,868 9,929 33,125 Royalty payments (5) 1,294 15,927 1,164 2,327 2,327 10,108 $ 135,338 $ 231,842 $ 73,867 $ 98,783 $ 13,356 $ 45,838 (1) Includes interest at 9%. (2) Includes interest at rates disclosed in note 13(b) in effect at December 31, 2014. (3) Includes interest at rates disclosed in note 13(c) in effect at December 31, 2014. (4) Includes interest at rates disclosed in note 13(d) in effect at December 31, 2014. (5) From fiscal 2011 to 2015 inclusive, the Company is obligated to pay annual royalties equal to the greater of $ 1,164 1,350 0.33 12,693 13,500 26,514 28,189
Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block]	The Company’s functional currency is the Canadian dollar. The U.S. dollar and the Euro carrying amount of financial instruments subject to exposure to foreign currency risk in the consolidated balance sheet at December 31, 2014 is as follows: U.S. dollars Cash and cash equivalents $ 69,899 Short-term investments 500 Accounts receivable 14,304 Accounts payable 4,012 Euros Cash and cash equivalents € 9,190 Accounts receivable 38,916 Accounts payable 27,667

Company organization and oper53

Company organization and operations (Details Textual)	12 Months Ended
	Dec. 31, 2014l
Minimum [Member]
Capacity of Medium Petroleum Based Fuel Engine	5.9
Capacity of Heavy Duty Petroleum Based Fuel Engine	11
Capacity of High Horsepower Petroleum Based Fuel Engine	16
Maximum [Member]
Capacity of Light Petroleum Based Fuel Engine	5.9
Capacity of Medium Petroleum Based Fuel Engine	10
Capacity of Heavy Duty Petroleum Based Fuel Engine	16

Significant accounting polici54

Significant accounting policies (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Canadian dollar
Foreign Currency Exchange Rate, Translation	0.86	0.94
Average Foreign Currency Exchange Rate Translation	0.91	0.97
Australian dollar
Foreign Currency Exchange Rate, Translation	0.82	0.89
Average Foreign Currency Exchange Rate Translation	0.90	0.97
Euro
Foreign Currency Exchange Rate, Translation	1.21	1.38
Average Foreign Currency Exchange Rate Translation	1.33	1.33
RMB
Foreign Currency Exchange Rate, Translation	0.16	0.17
Average Foreign Currency Exchange Rate Translation	0.16	0.16
Swedish Krona
Foreign Currency Exchange Rate, Translation	0.13	0.16
Average Foreign Currency Exchange Rate Translation	0.15	0.15

Significant accounting polici55

Significant accounting policies (Details 1)	12 Months Ended
	Dec. 31, 2014
Buildings [Member]
Property, Plant and Equipment, Useful Life (in years)	15 years
Property, Plant and Equipment, Depreciation Methods	Straight-line
Computer equipment and software [Member]
Property, Plant and Equipment, Useful Life (in years)	3 years
Property, Plant and Equipment, Depreciation Methods	Straight-line
Furniture and fixtures [Member]
Property, Plant and Equipment, Useful Life (in years)	5 years
Property, Plant and Equipment, Depreciation Methods	Straight-line
Machinery and equipment [Member]
Property, Plant and Equipment, Depreciation Methods	Straight-line
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (in years)	8 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (in years)	10 years
Leasehold improvements [Member]
Property, Plant and Equipment, Estimated Useful Lives	Lease term
Property, Plant and Equipment, Depreciation Methods	Straight-line

Significant accounting polici56

Significant accounting policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Retained Earnings (Accumulated Deficit), Total	$ (764,960)	$ (615,342)
Cash and Cash Equivalents, at Carrying Value, Total	$ 93,282	$ 178,513	$ 188,958	$ 63,285
Revenue Recognition, Multiple-deliverable Arrangements, Determination of Selling Price, Method	the Company requires that a substantial majority of the selling prices for a product or service falls within a reasonably narrow pricing range, generally evidenced by the pricing rates of approximately 85% of such historical stand-alone transactions falling within plus or minus 10% of the median rate.
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years

Business Combinations (Details)

Business Combinations (Details) - 12 months ended Dec. 31, 2014 € in Thousands, $ in Thousands	USD ($)	EUR (€)
BAF Technologies Inc [Member]
Other tangible assets, including cash	$ 9,116
Property, plant and equipment	905
Intangible assets subject to amortization	7,729
Goodwill	18,542
Total assets acquired	36,292
Less: total liabilities	(6,594)
Total net assets acquired	29,698
Payable to Clean Energy	2,322
Common shares issued	24,091
Common shares to be issued	3,285
Business Combination, Consideration Transferred	29,698
Prins Autogassystemen Holding B.V. [Member]
Other tangible assets, including cash	13,138
Property, plant and equipment	3,824
Intangible assets subject to amortization	3,024
Goodwill	3,221
Total assets acquired	23,207
Current liabilities	7,211
Deferred income tax liabilities	979
Debt assumed (note 13b and c)	11,905	€ (9,700)
Less: total liabilities	20,095
Total net assets acquired	3,112
Paid to sellers	$ 3,112

Business Combinations (Details

Business Combinations (Details 1) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue for the period			$ 130,569	$ 164,032	$ 155,626
Pro forma revenue for the period			161,562	202,166
Net loss for the period			(149,618)	(185,410)	(98,774)
Pro forma net loss for the period			(149,527)	(180,284)
Prins Autogassystemen Holding B.V. [Member]
Revenue for the period	$ 1,196		30,993	30,885
Net loss for the period	$ (301)		91	9,164
BAF Technologies Inc [Member]
Revenue for the period		$ 17,097	0	7,249
Pro forma revenue for the period				171,281	181,972
Net loss for the period		$ 3,512	$ 0	(4,038)
Pro forma net loss for the period				$ (189,448)	$ (100,946)

Business Combinations (Detail59

Business Combinations (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
BAF Technologies Inc [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	$ 7,729
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years
BAF Technologies Inc [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	$ 6,350
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years
BAF Technologies Inc [Member] | Core Technologies [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	$ 160
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Other Intangible Assets [Member] | BAF Technologies Inc [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	$ 1,219
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years

Business Combinations (Detail60

Business Combinations (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue	$ 161,562	$ 202,166
Net loss	$ (149,527)	(180,284)
BAF Technologies Inc [Member]
Revenue		171,281	$ 181,972
Net loss		$ (189,448)	$ (100,946)

Business Combinations (Detail61

Business Combinations (Details Textual) $ / shares in Units, € in Thousands, $ in Thousands	1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2014USD ($)	Jun. 28, 2013USD ($)$ / sharesshares	Mar. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2014EUR (€)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)	Dec. 31, 2014EUR (€)
Business Acquisition, Share Price | $ / shares		$ 30.62
Revenue, Net, Total					$ 130,569		$ 164,032	$ 155,626
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total					(149,618)		(185,410)	$ (98,774)
Finite-lived Intangible Assets Acquired					$ 3,024
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					5 years	5 years
Land and Building [Member]
Finite-Lived Intangible Asset, Useful Life					15 years	15 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life					5 years	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life					20 years	20 years
BAF Technologies Inc [Member]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares		718,485
Business Acquisition, Share Price | $ / shares		$ 33.53
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		$ 24,091
Business Combination Consideration Payable		5,000
Business Combination Consideration Payable In Excess		$ 2,322
Business Combination, Acquisition Related Costs							$ 493
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	$ 1,178				$ 1,178
Finite-Lived Intangible Asset, Useful Life							8 years
Revenue, Net, Total				$ 17,097	0		$ 7,249
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total				$ 3,512	0		(4,038)
Business Acquisition, Date of Acquisition Agreement		Jun. 28, 2013
Goodwill, Acquired During Period					$ 18,542
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					7 years	7 years
BAF Technologies Inc [Member] | Deferred Income Tax Charge [Member]
Business Combination, Consideration Transferred, Other					$ 296
BAF Technologies Inc [Member] | Inventory Valuation and Obsolescence [Member]
Business Combination, Consideration Transferred, Other					$ 5,792
BAF Technologies Inc [Member] | Minimum [Member]
Finite-Lived Intangible Asset, Useful Life					3 years	3 years
BAF Technologies Inc [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life					10 years	10 years
Clean Energy [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares		97,975
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		$ 3,285
Payments to Acquire Interest in Subsidiaries and Affiliates, Total			$ 5,000
Fair Value Of Products And Services		$ 2,678
Prins Autogassystemen Holding B.V. [Member]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%				100.00%				100.00%
Business Combination, Acquisition Related Costs					$ 342
Business Acquisitions Purchase Price Allocation Current Assets Cash And Cash Equivalents	$ 61				$ 61
Finite-Lived Intangible Asset, Useful Life					5 years	5 years
Payments to Acquire Businesses, Gross					$ 15,017	€ 12,200
Revenue, Net, Total	1,196				30,993		30,885
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total	(301)				91		$ 9,164
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	3,112				$ 3,112				€ 2,500
Business Acquisition, Date of Acquisition Agreement					Dec. 2, 2014	Dec. 2, 2014
Goodwill, Acquired During Period					$ 3,221
Business Combinations, Purchase Price Allocation, Notes Payable and Long-term Debt	$ (11,905)				(11,905)				€ 9,700
Prins Autogassystemen Holding B.V. [Member] | Land and Building [Member]
Business Combination, Consideration Transferred, Other					3,824
Prins Autogassystemen Holding B.V. [Member] | Inventory Valuation and Obsolescence [Member]
Business Combination, Consideration Transferred, Other					$ 4,975
Stock Purchase Agreement [Member] | BAF Technologies Inc [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares		816,460

Accounts Receivable (Details)

Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Customer trade receivable	$ 43,256	$ 54,017
Government funding receivable	38	483
Due from joint venture (note 20)	2,538	3,621
Other receivables	3,269	2,689
Income tax receivable	499	77
Allowance for doubtful accounts	(2,751)	(1,572)
Accounts Receivable Net Current	$ 46,849	$ 59,315

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Purchased parts	$ 28,227	$ 23,228
Work-in-process	4,879	10,770
Finished goods	8,718	6,628
Inventory Net	$ 41,824	$ 40,626

Inventories (Details Textual)

Inventories (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Inventory Write-down	$ 2,102	$ 4,925	$ 0

Long-term investments (Details)

Long-term investments (Details) - USD ($) $ in Thousands		Dec. 31, 2014	Dec. 31, 2013
Long Term Investments		$ 33,324	$ 22,128
Weichai Westport Inc [Member]
Long Term Investments	[1]	18,791	14,534
Cummins Westport, Inc. [Member]
Long Term Investments		13,196	7,191
Other Equity Accounted for Investees [Member]
Long Term Investments		$ 1,337	$ 403
[1]	On July 3, 2010, the Company invested $4,316 under an agreement with Weichai Holding Group Co. Ltd. and Hong Kong Peterson (“CNG”) Equipment Ltd. to form Weichai Westport Inc. (“WWI”). On October 11, 2011, the Company invested an additional $955 in WWI. The Company has a 35% equity interest in WWI. For the year ended December 31, 2014, the Company recognized its share of WWI’s income of $6,027 (year ended December 31, 2013 - $4,264; year ended December 31, 2012 - $2,881), as income from investment accounted for by the equity method. Assets, liabilities, revenue and expenses of WWI as of and for the periods presented are as follows: December 31, 2014 December 31, 2013 Current assets: Cash and short-term investments $ 11,734 $ 4,696 Accounts receivable 72,121 31,967 Inventory 83,594 80,412 Other current assets 1,249 176 Long-term assets Property, plant and equipment 5,736 7,021 Deferred income tax assets 7,781 6,874 Total assets $ 182,215 $ 131,146 Current liabilities: Accounts payable and accrued liabilities $ 128,838 $ 93,016 Total liabilities $ 128,838 $ 93,016 Years ended December 31, 2014 2013 2012 Product revenue $ 618,465 $ 466,580 $ 272,086 Cost of revenue and expenses: Cost of product revenue 539,963 429,238 247,299 Operating expenses 58,208 22,846 15,022 598,171 452,084 262,321 Income before income taxes 20,294 14,496 9,765 Income tax expense 3,076 2,315 1,536 Income for the period $ 17,218 $ 12,181 $ 8,229

Long-term investments (Details

Long-term investments (Details 1) - Weichai Westport Inc [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and short-term investments	$ 11,734	$ 4,696
Accounts receivable	72,121	31,967
Inventory	83,594	80,412
Other current assets	1,249	176
Long-term assets
Property, plant and equipment	5,736	7,021
Deferred income tax assets	7,781	6,874
Total assets	182,215	131,146
Current liabilities:
Accounts payable and accrued liabilities	128,838	93,016
Total liabilities	128,838	93,016
Product revenue	618,465	466,580	$ 272,086
Cost of revenue and expenses:
Cost of product revenue	565,943	429,238	247,299
Operating expenses	32,227	22,846	15,022
Equity Method Investment Summarized Financial Information Cost of Revenue and Expenses	598,170	452,084	262,321
Income before income taxes	20,295	14,496	9,765
Income tax expense	3,076	2,315	1,536
Income for the period	$ 17,219	$ 12,181	$ 8,229

Long-term investments (Detail67

Long-term investments (Details 2) - Cummins Westport, Inc. [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and short-term investments	$ 107,415	$ 73,736
Accounts receivable	12,741	4,645
Current portion of deferred income tax assets	21,967	13,958
Other current assets	116	210
Long-term assets:
Property, plant and equipment	1,294	1,096
Deferred income tax assets	29,408	21,698
Total assets	172,941	115,343
Current liabilities:
Current portion of warranty liability	48,818	18,395
Current portion of deferred revenue	8,029	5,478
Accounts payable and accrued liabilities	6,419	7,772
Current liabilities	63,266	31,645
Long-term liabilities:
Warranty liability	43,983	49,174
Deferred revenue	34,345	17,815
Other long-term liabilities	2,771	2,400
Long-term liabilities	81,099	69,389
Total liabilities	144,365	101,034
Product revenue	283,551	261,012	$ 161,741
Parts revenue	53,683	49,639	36,274
Equity Method Investment Summarized Financial Information Total revenue	337,234	310,651	198,015
Cost of revenue and expenses:
Cost of product and parts revenue	270,832	246,403	136,575
Research and development	21,131	21,522	12,114
General and administrative	1,202	1,348	1,417
Sales and marketing	22,514	17,839	12,541
Foreign exchange (gain) loss	34	(7)	(18)
Bank charges, interest and other	805	607	472
Equity Method Investment Summarized Financial Information Cost of Revenue and Expenses	316,518	287,712	163,101
Income from operations	20,716	22,939	34,914
Interest and investment income	260	117	530
Income before income taxes	20,976	23,056	35,444
Income tax expense (recovery):
Current	21,514	24,600	16,362
Deferred	(15,719)	(18,566)	(6,517)
Equity Method Investment Summarized Financial Information Income tax expense (recovery)	5,795	6,034	9,845
Income for the period	$ 15,181	$ 17,022	$ 25,599

Long-term investments (Detail68

Long-term investments (Details Textual) - USD ($) $ in Thousands	Oct. 11, 2011	Jul. 31, 2010	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity Method Investment, Profit Sharing Percentage			75.00%
Payments to Acquire Equity Method Investments	$ 955
Income (Loss) from Equity Method Investments			$ 14,222	$ 13,444	$ 16,190
Equity Method Investment, Ownership Percentage			50.00%
Cummins Westport, Inc. [Member]
Equity Method Investment, Profit Sharing Percentage			25.00%
Equity Method Investment, Summarized Financial Information, Net Income (Loss)			$ 15,181	17,022	25,599
Income (Loss) from Equity Method Investments			$ 8,136	9,433	13,232
Equity Method Investment, Ownership Percentage			50.00%
Westport Light Duty Canada Inc [Member]
Equity Method Investment, Profit Sharing Percentage		35.00%
Equity Method Investment, Summarized Financial Information, Net Income (Loss)		$ 4,316
Income (Loss) from Equity Method Investments			$ 6,027	$ 4,264	$ 2,881

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Accounts Receivable [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Carrying Amount	$ 2,538	$ 3,621
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	2,538	3,621
Equity Method Investments [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Carrying Amount	13,196	7,191
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 13,196	$ 7,191

Variable Interest Entities (D70

Variable Interest Entities (Details Textual)	1 Months Ended
	Feb. 20, 2012	Dec. 31, 2014
Variable Interest Entity [Line Items]
Equity Method Investment, Ownership Percentage		50.00%
Westport Innovations Inc [Member]
Variable Interest Entity [Line Items]
Equity Method Investment, Ownership Percentage		50.00%
Description Of Profit Sharing Percentage	75.00%
Cummins Westport Inc [Member]
Variable Interest Entity [Line Items]
Equity Method Investment, Ownership Percentage		50.00%
Description Of Profit Sharing Percentage	25.00%

Property, plant and equipment71

Property, plant and equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Cost	$ 112,879	$ 117,411
Accumulated depreciation	54,745	50,062
Net book value	58,134	67,349
Land and buildings [Member]
Cost	3,015
Accumulated depreciation	0
Net book value	3,015
Computer equipment and software [Member]
Cost	9,277	9,652
Accumulated depreciation	7,063	6,174
Net book value	2,214	3,478
Furniture and fixtures [Member]
Cost	6,194	6,608
Accumulated depreciation	1,798	1,692
Net book value	4,396	4,916
Machinery and equipment [Member]
Cost	81,933	86,067
Accumulated depreciation	36,135	32,099
Net book value	45,798	53,968
Leasehold improvements [Member]
Cost	12,460	15,084
Accumulated depreciation	9,749	10,097
Net book value	$ 2,711	$ 4,987

Property, plant and equipment72

Property, plant and equipment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Depreciation, Total	$ 14,106	$ 12,246	$ 8,131
Machinery and Equipment [Member]
Capital Leased Assets, Gross	16,572	18,788
Capital Leases, Balance Sheet, Assets by Major Class, Net, Total	$ 1,714	$ 5,465

Intangible assets (Details)

Intangible assets (Details) - USD ($) $ in Thousands	Dec. 31, 2014		Dec. 31, 2013
Cost	$ 38,698		$ 48,151
Accumulated amortization	10,778		9,807
Net book value	27,920		38,344
Patents and trademarks [Member]
Cost	18,425		20,974
Accumulated amortization	3,445		2,900
Net book value	14,980		18,074
Technology [Member]
Cost	6,449	[1]	7,468
Accumulated amortization	3,142	[1]	2,796
Net book value	3,307	[1]	4,672
Customer contracts [Member]
Cost	13,762	[1]	18,447	[2]
Accumulated amortization	4,163	[1]	3,886	[2]
Net book value	9,599	[1]	14,561	[2]
Other intangibles [Member]
Cost	62	[1]	1,262
Accumulated amortization	28	[1]	225
Net book value	$ 34	[1]	$ 1,037
[1]	The Company reviews its long-lived assets for impairment including property, plant and equipment, and intangible assets whenever events and changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Based on the revenue and operating results and decline in the oil price, the Company concluded there were impairment indicators requiring the performance of a long-lived assets impairment test for customer contracts, technology and other intangibles as of November 30, 2014. Accordingly non-cash impairment charges aggregating to $5,823 were recorded during the year ended December 31, 2014 which reduced the carrying values of technology by $115, customer contracts by $4,705 and other intangibles by $1,003 for the Westport Operations segment.
[2]	During the year ended December 31, 2013, there was a significant decline in revenue from the lower than expected adoption rate of natural gas vehicles in our customer contracts. An impairment analysis of the intangibles balance indicated that the carrying value exceeded the fair value of customer contracts. Accordingly, an intangible impairment charge of $1,721 related to customer contracts in Sweden was recognized in the Westport Operations segment. The fair value of customer contracts was determined using the present value of expected cash flows discounted at a rate equivalent to a market participant’s weighted-average cost of capital.

Intangible assets (Details Text

Intangible assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amortization of Intangible Assets	$ 4,560	$ 4,042	$ 3,264
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	3,345
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3,345
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3,345
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3,345
Finite-Lived Intangible Assets, Amortization Expense, Year Five	3,345
Impairment of Intangible Assets, Finite-lived	5,823	$ 1,721	$ 0
Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Period Increase (Decrease)	1,003
Customer Contracts [Member]
Finite-Lived Intangible Assets, Period Increase (Decrease)	4,705
Technology Equipment [Member]
Finite-Lived Intangible Assets, Period Increase (Decrease)	$ 115

Goodwill (Details)

Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Balance, beginning of period:	$ 41,500	$ 56,879
Impairment losses	(18,543)	(34,964)	$ 0
Impact of foreign exchange changes	(2,826)	1,043
Balance, end of period	23,352	41,500	$ 56,879
Prins Autogassystemen Holding B.V. [Member]
Acquisition	3,221	0
BAF Technologies Inc [Member]
Acquisition	$ 0	$ 18,542

Goodwill (Details Textual)

Goodwill (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill, Impairment Loss	$ 18,543	$ 34,964	$ 0
Goodwill	23,352	41,500	$ 56,879
Westport Operations Segment [Member]
Goodwill, Impairment Loss		$ 34,964
Goodwill	$ 23,352

Accounts payable and accrued 77

Accounts payable and accrued liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Trade accounts payable	$ 41,796	$ 42,872
Accrued payroll	5,270	7,937
Accrued interest	1,237	893
Income taxes payable	580	709
Other payables (note 22b)	6,619	2,381
Accounts Payable, Current	$ 55,502	$ 54,792

Long-term debt (Details)

Long-term debt (Details) - USD ($) $ in Thousands		Dec. 31, 2014	Dec. 31, 2013
Debt and Capital Lease Obligations, Total		$ 78,542	$ 66,013
Current portion		(18,955)	(53,025)
Long-term Debt and Capital Lease Obligations, Total		59,587	12,988
Senior revolving financing [Member]
Debt and Capital Lease Obligations, Total	[1]	12,101	13,779
Other bank financing [Member]
Debt and Capital Lease Obligations, Total	[2]	2,646	403
Subordinated debenture notes [Member]
Debt and Capital Lease Obligations, Total	[3]	46,491	33,847
Senior financing [Member]
Debt and Capital Lease Obligations, Total	[4]	15,910	15,941
Capital lease obligations [Member]
Debt and Capital Lease Obligations, Total	[5]	$ 1,394	$ 2,043
[1]	The senior revolving financing facility bears interest at the 6-month Euribor plus 2.5% (2.6% as at December 31, 2014) and will be repaid through two principal payments of $6,050 (€5,000) on March 31, 2016 and October 2, 2017. Interest is paid semi-annually. The Company has pledged its interest in Emer as a general guarantee for its senior revolving financing.Throughout the entire term of these financing arrangements, the Company is required to meet certain financial and non-financial covenants. As of December 31, 2014, the Company is in compliance with all covenants under the financing arrangements.
[2]	December 31, 2014 December 31, 2013 Emer other financing (1) 1,129 247 Prins other financing (2) 1,424 — Other financing 93 156 2,646 403 (1) Emer other financing consists of various unsecured bank financing arrangements that carry rates of interest ranging from 1.01% to 2.90% (2013 - 1.01% to 8.00%) and are payable on maturity dates ranging from June 23, 2015 to June 23, 2017. (2) Prins other bank financing consists of a credit facility for maximum borrowings of €2,000. The credit facility bears interest at the 3 month Euribor + 3.5% (3.6% as of December 31, 2014). The credit facility is governed by an accounts receivable list requirement limiting such borrowings to 60% of accepted accounts receivable.
[3]	On September 23, 2011, the Company raised $33,720 (CDN$36,000) through the issuance of debentures to Macquarie Private Wealth Inc. (“Macquarie”) on a private placement basis (the “Initial Debentures”). The Initial Debentures were unsecured and subordinated to senior indebtedness, matured on September 22, 2014, and bore interest at 9% per annum, payable in cash semi-annually in arrears on March 15 and September 15 of each year during the term, which commenced on March 15, 2012. The Initial Debentures were redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount of the debentures on or before March 22, 2013. After March 22, 2013 and before maturity, the debentures were redeemedable at a price equal to $1,100 per $1,000 principal amount. On June 27, 2014, the Company raised $17,797 (CDN$19,000) through the issuance of debentures to Richardson GMP Limited (“RGMP”), formerly Macquarie Private Wealth Inc. on a private placement basis (the “Additional Debentures”). In conjunction with the issuance of the Additional Debentures, the Company amended the terms of the Initial Debentures (the “Amended Initial Debentures”). The Amended Initial Debentures are ranked pari passu with the Additional Debentures and both shall be treated as the same series of debentures (the “New Debentures”) with the same terms. The New Debentures totaling $51,517 (CDN$55,000) are composed of the Additional Debentures $17,797 (CDN$19,000) and the Amended Initial Debentures $33,720 (CDN$36,000). The New Debentures are unsecured and subordinated to senior indebtedness, mature on September 15, 2017, and bear interest at 9% per annum, payable in cash semi-annually in arrears on March 15 and September 15 of each year during the term. The New Debentures are redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount of the debentures after September 15, 2015 and on or before March 15, 2016. After March 15, 2016 and before maturity, the debentures can be redeemed at a price equal to $1,100 per $1,000 principal amount. The New Debentures contain an extension option that will allow each debenture holder to have the option to extend, a maximum of six times, the maturity date for an additional period of six months provided that greater than CDN$10,000 of the aggregate principal amount of the New Debentures remain outstanding. The Company has performed the assessment of embedded derivatives within the New Debentures and concluded that there is an embedded derivative that requires bifurcation related to the extension option from the New Debentures. The extension option was deemed not clearly and closely related to the New Debentures and is separately accounted for as a standalone derivative. The Company recorded this embedded derivative as a non-current liability on its consolidated balance sheet. At issuance on June 27, 2014, the embedded derivative’s fair value was determined to be $1,169 (CDN$1,249), which was recorded as a reduction to the carrying value of the New Debentures. The Company is accreting the carrying value of the debt to interest expense by using the effective interest method through to the maturity date of the New Debentures. The Company accreted $82 of the embedded derivative discount for the year ended December 31, 2014 (2013 $Nil ). The embedded derivative is subsequently adjusted to fair value at each reporting date, with the associated fair value loss (gain) recorded in interest and other income (loss). The fair value adjustment recorded for the year ended December 31, 2014 was $(1,082) (2013 $Nil). The derivative liability is included in other long term liabilities on the consolidated balance sheets. The Company determined the fair value of the embedded derivative using the Interest Rate Option Pricing Method which incorporated the Black-Karasinski model.
[4]	December 31, 2014 December 31, 2013 Emer Senior Financing (1) $ 9,376 $ 15,941 Prins Senior Financing (2) 3,630 — Prins Senior Mortgage Loan (3) 2,904 — $ 15,910 $ 15,941 (1) The senior financing agreement bears interest at the 6-month Euribor plus 2.5% (2.7% as at December 31, 2014) and is recorded at amortized cost using the effective interest rate method. Interest is paid semi-annually. The Company has pledged its interest in Emer as a general guarantee for its senior financing. The senior financing matures in 2017. (2) A total of $7,521 Prins senior financing was assumed on the acquisition of Prins (note 4a). Principal of $3,891 was repaid on December 2, 2014. The senior financing agreement bears interest at the 3-month Euribor plus 3.5% (3.6% as at December 31, 2014). Interest is paid quarterly. The Company has pledged its interest in Prins as a general guarantee for its senior financing. The senior financing matures in 2016. (3) The Prins senior mortgage loan was assumed on the acquisition of Prins (note 4a). The senior mortgage loan bears interest at 3-month Euribor plus 1% (1.1% as at December 31, 2014). Interest is paid quarterly. The Company has pledged its interest in Prins's building as a general guarantee for its senior mortgage loan. The senior mortgage loan matures in 2020. The principal repayment schedule of the senior financings are as follows for the years ended December 31: Emer Senior Financing Prins Senior Financing Prins Senior Mortgage Loan Total 2015 $ 4,020 $ 1,633 $ 363 $ 6,016 2016 4,239 1,997 363 6,599 2017 1,117 — 363 1,480 2018 — — 363 363 2019 and thereafter — — 1,452 1,452 $ 9,376 $ 3,630 $ 2,904 $ 15,910
[5]	The Company has capital lease obligations that have initial terms of three to five years at interest rates ranging from 3.07% to 4.93% (2013 - 3.07% to 7.32%). The capital lease obligations require the following minimum annual principal payments during the respective fiscal years: 2015 $ 522 2016 328 2017 327 2018 191 2019 26 $ 1,394

Long-term debt (Details 1)

Long-term debt (Details 1) - USD ($) $ in Thousands		Dec. 31, 2014	Dec. 31, 2013
Long-term Debt		$ 15,910	$ 15,941
Emer Senior Financing [Member]
Long-term Debt	[1]	9,376	15,941
Prins Senior Financing [Member]
Long-term Debt	[2]	3,630	0
Prins Senior Mortgage Loan [Member]
Long-term Debt	[3]	$ 2,904	$ 0
[1]	The Emer S.p.A ("Emer") senior financing agreement bears interest at the 6-month Euribor plus 2.5% (2.7% as at December 31, 2014) and is recorded at amortized cost using the effective interest rate method. Interest is paid semi-annually. The Company has pledged its interest in Emer as a general guarantee for its senior financing. The senior financing matures in 2017.
[2]	A total of $7,521 Prins senior financing was assumed on the acquisition of Prins (note 4a). Principal of $3,891 was repaid on December 2, 2014. The senior financing agreement bears interest at the 3-month Euribor plus 3.5% (3.6% as at December 31, 2014). Interest is paid quarterly. The Company has pledged its interest in Prins as a general guarantee for its senior financing. The senior financing matures in 2016.
[3]	The Prins senior mortgage loan was assumed on the acquisition of Prins (note 4a). The senior mortgage loan bears interest at 3-month Euribor plus 1% (1.1% as at December 31, 2014). Interest is paid quarterly. The Company has pledged its interest in Prins's building as a general guarantee for its senior mortgage loan. The senior mortgage loan matures in 2020.

Long-term debt (Details 2)

Long-term debt (Details 2) - USD ($) $ in Thousands		Dec. 31, 2014	Dec. 31, 2013
2,015		$ 6,016
2,016		6,599
2,017		1,480
2,018		363
2019 and thereafter		1,452
Long-term Debt		15,910	$ 15,941
Emer Senior Financing [Member]
2,015		4,020
2,016		4,239
2,017		1,117
2,018		0
2019 and thereafter		0
Long-term Debt	[1]	9,376	15,941
Prins Senior Financing [Member]
2,015		1,633
2,016		1,997
2,017		0
2,018		0
2019 and thereafter		0
Long-term Debt	[2]	3,630	0
Prins Senior Mortgage Loan [Member]
2,015		363
2,016		363
2,017		363
2,018		363
2019 and thereafter		1,452
Long-term Debt	[3]	$ 2,904	$ 0
[1]	The Emer S.p.A ("Emer") senior financing agreement bears interest at the 6-month Euribor plus 2.5% (2.7% as at December 31, 2014) and is recorded at amortized cost using the effective interest rate method. Interest is paid semi-annually. The Company has pledged its interest in Emer as a general guarantee for its senior financing. The senior financing matures in 2017.
[2]	A total of $7,521 Prins senior financing was assumed on the acquisition of Prins (note 4a). Principal of $3,891 was repaid on December 2, 2014. The senior financing agreement bears interest at the 3-month Euribor plus 3.5% (3.6% as at December 31, 2014). Interest is paid quarterly. The Company has pledged its interest in Prins as a general guarantee for its senior financing. The senior financing matures in 2016.
[3]	The Prins senior mortgage loan was assumed on the acquisition of Prins (note 4a). The senior mortgage loan bears interest at 3-month Euribor plus 1% (1.1% as at December 31, 2014). Interest is paid quarterly. The Company has pledged its interest in Prins's building as a general guarantee for its senior mortgage loan. The senior mortgage loan matures in 2020.

Long-term debt (Details 3)

Long-term debt (Details 3) - USD ($) $ in Thousands		Dec. 31, 2014	Dec. 31, 2013
Debt and Capital Lease Obligations		$ 78,542	$ 66,013
Emer Other Financing [Member]
Debt and Capital Lease Obligations	[1]	1,129	247
Prins Other Financing [Member]
Debt and Capital Lease Obligations	[2]	1,424	0
Other Financing [Member]
Debt and Capital Lease Obligations		$ 93	$ 156
[1]	Emer other financing consists of various unsecured bank financing arrangements that carry rates of interest ranging from 1.01% to 2.90% (2013 - 1.01% to 8.00%) and are payable on maturity dates ranging from June 23, 2015 to June 23, 2017.
[2]	Prins other bank financing consists of a credit facility for maximum borrowings of €2,000. The credit facility bears interest at the 3 month Euribor + 3.5% (3.6% as of December 31, 2014). The credit facility is governed by an accounts receivable list requirement limiting such borrowings to 60% of accepted accounts receivable.

Long-term debt (Details 4)

Long-term debt (Details 4) $ in Thousands	Dec. 31, 2014USD ($)
2,015	$ 522
2,016	328
2,017	327
2,018	191
2,019	26
Capital Leases, Future Minimum Payments Due	$ 1,394

Long-term debt (Details Textual

Long-term debt (Details Textual) € in Thousands, CAD in Thousands	Jun. 27, 2014USD ($)	Jun. 27, 2014CAD	Sep. 23, 2011USD ($)	Sep. 23, 2011CAD	Dec. 31, 2014USD ($)	Dec. 31, 2014EUR (€)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)	Dec. 31, 2014CAD	Dec. 31, 2014EUR (€)	Jun. 27, 2014CAD
Debt Instrument, Interest Rate During Period					9.00%	9.00%
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity before Increase | CAD									CAD 30,000
Proceeds from Issuance of Debt					$ 0		$ 0	$ 2,450,000
Debt Instrument, Maturity Date	Sep. 15, 2017	Sep. 15, 2017
Emer Senior Financing [Member]
Debt Instrument, Description of Variable Rate Basis					6-month Euribor	6-month Euribor
Debt Instrument, Basis Spread on Variable Rate					2.50%	2.50%
Debt Instrument, Interest Rate at Period End									2.70%	2.70%
Prins Senior Financing [Member]
Debt Instrument, Description of Variable Rate Basis					3-month Euribor	3-month Euribor
Debt Instrument, Basis Spread on Variable Rate					3.50%	3.50%
Debt Instrument, Interest Rate at Period End									3.60%	3.60%
Debt Instrument, Periodic Payment, Principal					$ 3,891,000
Prins Senior Mortgage Loan [Member]
Debt Instrument, Description of Variable Rate Basis					3-month Euribor	3-month Euribor
Debt Instrument, Basis Spread on Variable Rate					1.00%	1.00%
Debt Instrument, Interest Rate at Period End									1.10%	1.10%
Emer Other Financing [Member]
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Debt Instrument, Maturity Date Range, Start					Jun. 23, 2015	Jun. 23, 2015
Debt Instrument, Maturity Date Range, End					Jun. 23, 2017	Jun. 23, 2017
Prins Other Financing [Member]
Debt Instrument, Description of Variable Rate Basis					3 month Euribor	3 month Euribor
Debt Instrument, Basis Spread on Variable Rate					3.50%	3.50%
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity | €										€ 2,000
Percentage Of Borrowings Under Account Receivables					60.00%	60.00%
Letter of Credit [Member]
Debt Instrument, Interest Rate During Period					0.75%	0.75%	0.75%
Minimum [Member] | Emer Other Financing [Member]
Debt Instrument, Interest Rate During Period					1.01%	1.01%	1.01%
Maximum [Member] | Emer Other Financing [Member]
Debt Instrument, Interest Rate During Period					2.90%	2.90%	8.00%
Subordinated Debt [Member]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate			9.00%	9.00%
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Proceeds from Issuance of Debt	$ 17,797,000	CAD 19,000	$ 33,720,000	CAD 36,000
Debt Instrument, Redemption, Description			The Initial Debentures were redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount of the debentures on or before March 22, 2013	The Initial Debentures were redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount of the debentures on or before March 22, 2013
Revolving Credit Facility [Member]
Debt Instrument, Description of Variable Rate Basis					6-month Euribor	6-month Euribor
Debt Instrument, Basis Spread on Variable Rate					2.50%	2.50%
Debt Instrument, Periodic Payment, Principal					$ 6,050,000	€ 5,000
Capital Lease Obligations [Member] | Minimum [Member]
Debt Instrument, Interest Rate During Period					3.07%	3.07%	3.07%
Capital Lease Obligations, Initial Lease Term					3 years	3 years
Capital Lease Obligations [Member] | Maximum [Member]
Debt Instrument, Interest Rate During Period					4.93%	4.93%	7.32%
Capital Lease Obligations, Initial Lease Term					5 years	5 years
New Debentures [Member]
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Maximum Number Of Extension Options					six times	six times
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 1,169,000										CAD 1,249
Accretion Expense					$ 82,000		$ 0
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net					$ (1,082,000)		$ 0
Debt Instrument, Term	6 months	6 months
New Debentures [Member] | Richardson GMP Limited [Member]
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Proceeds from Issuance of Debt	$ 51,517,000	CAD 55,000
New Debentures [Member] | Richardson GMP Limited [Member] | Debt Instrument, Redemption, Period Two [Member]
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Debt Instrument, Redemption, Description	Debentures are redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount	Debentures are redeemable at the option of the Company at a price equal to $1,150 per $1,000 principal amount
New Debentures [Member] | Richardson GMP Limited [Member] | Debt Instrument, Redemption, Period Three [Member]
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Debt Instrument, Redemption, Description	debentures can be redeemed at a price equal to $1,100 per $1,000 principal amount.	debentures can be redeemed at a price equal to $1,100 per $1,000 principal amount.
New Debentures [Member] | Minimum [Member]
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Proceeds from Issuance of Debt | CAD		CAD 10,000
Amended Initial Debentures [Member] | Richardson GMP Limited [Member]
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Proceeds from Issuance of Debt	$ 33,720,000	CAD 36,000

Warranty liability (Details)

Warranty liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Balance, beginning of period	$ 28,845	$ 6,380	$ 4,401
Warranty assumed on acquisition	1,952	582	0
Warranty claims	(10,709)	(5,397)	(3,099)
Warranty accruals	2,734	4,153	5,303
Change in estimate	0	22,837	0
Impact of foreign exchange changes	287	290	(225)
Balance, end of period	23,109	28,845	6,380
Less: Current portion	(9,696)	(9,955)	(2,072)
Long-term portion	$ 13,413	$ 18,890	$ 4,308

Other long-term liabilities (De

Other long-term liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2014	Dec. 31, 2013
Severance indemnity (a)	[1]	$ 1,519	$ 1,547
Contingent consideration payable related to AFV acquisition (b)	[2]	1,240	878
Derivative Liability (note 13a)		86	0
Deferred lease inducements		0	16
Other Liabilities		2,845	2,441
Current portion (included in accounts payable and accrued liabilities, other payables)		(1,240)	0
Other Liabilities, Noncurrent, Total		$ 1,605	$ 2,441
[1]	Italian law requires companies to make a mandatory termination payment to employees. It is paid, as a lump sum, when the employment ends for any reason such as retirement, resignation or layoff. The severance indemnity liability is calculated in accordance with local civil and labour laws based on each employee’s length of service, employment category and remuneration. There is no vesting period or funding requirement associated with the liability. The liability recorded in the consolidated balance sheet is the amount that the employee would be entitled to if the employee terminates immediately. This liability for severance indemnities relates primarily to the Company’s employees in Italy.
[2]	The total purchase price to acquire AFV also includes earn-out payments payable in the Company’s shares and tied to revenue and production milestones to be achieved no later than December 31, 2014. This contingent consideration has a fair value of $407 as at December 31, 2014 (December 31, 2013 - $427).The Company recorded compensation expense relating to two employees of AFV who receive earn-out payments in the Company’s shares that are tied to revenue and production milestones to be achieved no later than December 31, 2014 and contingent upon continuing employments. This contingent consideration has a fair value of $823 as at December 31, 2014 (December 31, 2013 - $451).Subsequent to year end 325,073 shares were issued to the two employees of AFV at $4.51CDN per share.

Other long-term liabilities (86

Other long-term liabilities (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)shares	Dec. 31, 2014CAD / shares	Dec. 31, 2013USD ($)
Business Acquisition Contingent Consideration At Fair Value One	$ 407		$ 427
Business Acquisition Contingent Consideration Number of Employees	2
Business Acquisition Contingent Consideration Compensation at Fair Value	$ 833		$ 451
AFV [Member]
Shares, Issued | shares	325,073
Shares Issued, Price Per Share | CAD / shares		CAD 4.51

Government assistance (Details

Government assistance (Details Textual) CAD in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)	Dec. 31, 2014CAD	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)	Dec. 31, 2014CAD
Research and Development Arrangement, Contract to Perform for Others, Compensation Earned	$ 892		$ 640	$ 842
Payments for Cumulative Royalties under Agreement | CAD					CAD 8,364
Accounts Payable and Accrued Liabilities	1,470		1,269
Industry Canada Industrial Technologies Office [Member]
Annual Royalties Required to be Paid under Agreement	$ 1,164	CAD 1,350
Royalties to be Paid as Percentage of Revenue	0.33%	0.33%
Minimum Revenue Considered for Determining Annual Royalties to be Paid under Agreement	$ 11,638	CAD 13,500
Maximum Royalties to be Paid under Agreement	24,389	CAD 28,200
Royalty Expense	$ 1,481		$ 1,164
Government of Canada Department of Natural Resources [Member]
Royalties to be Paid as Percentage of Revenue	1.00%	1.00%
Maximum Royalties to be Paid under Agreement | CAD		CAD 1,000

Share capital, stock options 88

Share capital, stock options and other stock-based plans (Details) - Employee Stock Option [Member] - CAD / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of shares
Outstanding , beginning of period	816,450	996,047	328,027
Granted	0	0	770,727
Exercised	(43,071)	(111,986)	(93,044)
Forfeited/expired	(741,156)	(67,611)	(9,663)
Outstanding, end of period	32,223	816,450	996,047
Options exercisable, end of period	32,223	305,506	226,487
Weighted average exercise price
Outstanding, beginning of period Weighted Average Exercise Price	CAD 30.20	CAD 27.78	CAD 8.96
Granted Weighted Average Exercise Price	0	0	33.77
Exercised Weighted Average Exercise Price	6.17	6.80	10.49
Forfeited/expired Weighted Average Exercise Price	33.82	33.72	33.36
Outstanding, end of period Weighted Average Exercise Price	17.64	30.20	27.78
Options exercisable, end of period Weighted Average Exercise Price	CAD 17.64	CAD 24.15	CAD 8.06

Share capital, stock options 89

Share capital, stock options and other stock-based plans (Details 1) - Share units [Member] - CAD / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Outstanding, beginning of period (in units)	1,200,591	1,095,094	1,250,917
Granted (in units)	5,792,162	742,140	185,705
Exercised/Vested (in units)	(608,975)	(448,526)	(337,228)
Forfeited/expired (in units)	(1,045,905)	(188,117)	(4,300)
Outstanding, end of period (in units)	5,337,873	1,200,591	1,095,094
Units outstanding and exercisable, end of period (in units)	142,166	224,638	262,615
Outstanding, beginning of period (in Canadian dollars per share)	CAD 23.68	CAD 20.68	CAD 18.04
Granted (in Canadian dollars per share)	10.54	30.21	35.99
Exercised/Vested (in Canadian dollars per share)	19.52	24.44	19.34
Forfeited/expired (in Canadian dollars per share)	21.75	29.80	19.67
Outstanding, end of period (in Canadian dollars per share)	10.27	23.68	20.68
Units outstanding and exercisable, end of period (in Canadian dollars per share)	CAD 11.67	CAD 11.20	CAD 8.86

Share capital, stock options 90

Share capital, stock options and other stock-based plans (Details 2) - CAD CAD in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Employee Stock Option [Member]
Outstanding	CAD 0	CAD 1,337
Exercisable	0	1,337
Exercised	364	2,667
Share units [Member]
Outstanding	23,433	24,960
Exercisable	624	4,670
Exercised	CAD 7,238	CAD 18,041

Share capital, stock options 91

Share capital, stock options and other stock-based plans (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allocated Share-based Compensation Expense	$ 9,683	$ 14,283	$ 12,468
Research and development
Allocated Share-based Compensation Expense	1,749	2,195	2,251
General and administrative
Allocated Share-based Compensation Expense	5,884	10,201	6,752
Sales and marketing
Allocated Share-based Compensation Expense	$ 2,050	$ 1,887	$ 3,465

Share capital, stock options 92

Share capital, stock options and other stock-based plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 28, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			8,000,000
Allocated Share-based Compensation Expense			$ 9,683	$ 14,283	$ 12,468
Stock Issued During Period, Value, New Issues				152,340	273,556
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs				$ 5,065	$ 8,126
Business Acquisition, Share Price		$ 30.62
BAF Technologies Inc [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		718,485
Business Acquisition, Share Price		$ 33.53
Common Stock [Member]
Stock Issued During Period Shares Net Of Cancellation Upon Exercise Of Stock Options			652,046	721,186	513,490
Stock Issued During Period, Value, New Issues				$ 152,340	$ 273,556
Stock Issued During Period, Shares, New Issues	94,914			6,000,000	6,325,000
Share Price	$ 33.53			$ 25.39	$ 43.25
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs				$ 5,065	$ 8,126
Employee Stock Option [Member]
Allocated Share-based Compensation Expense			$ 1,764	2,094	$ 2,705
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate					0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate					47.79%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate					0.38%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term					3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Exercise Price, Ending Balance					$ 10.97
Share units [Member]
Allocated Share-based Compensation Expense			$ 7,919	$ 12,189	$ 9,763
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			0.00%
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total			$ 30,102
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 5 months 1 day
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			5,792,162	742,140	185,705
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures and Expirations, Total			1,045,905	188,117	4,300
PSU's [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			971,399	389,655
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures and Expirations, Total			963,575	54,876
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			4,820,763	352,485

Research and development expe93

Research and development expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Research and development expenses	$ 77,472	$ 91,772	$ 74,040
Government assistance (note 16)	(892)	(640)	(842)
Research and development	$ 76,580	$ 91,132	$ 73,198

Income taxes (Details)

Income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss before income taxes	$ (150,197)	$ (184,537)	$ (97,036)
Expected income tax recovery	(39,051)	(47,979)	(24,259)
Increase (reduction) in income taxes resulting from:
Non-deductible stock-based compensation	2,495	3,619	3,019
Other permanent differences	(446)	(2,562)	(2,158)
Withholding taxes	969	590	1,187
Change in enacted rates	0	0	62
Foreign tax rate differences, foreign exchange and other adjustments	7,409	3,858	(382)
Non-taxable income from equity investment	(3,739)	(2,851)	(3,308)
Change in valuation allowance	25,784	37,391	27,577
Goodwill impairment	(18,543)	(34,964)	0
Change in uncertain tax position	1,252	0	0
Income tax expense (recovery)	$ (579)	$ 873	$ 1,738

Income taxes (Details 1)

Income taxes (Details 1) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred income tax assets:
Net loss carry forwards	$ 129,258	$ 108,083
Intangible assets	4,091	4,276
Property, plant and equipment	6,836	5,446
Financing and share issuance costs	1,533	2,696
Warranty liability	5,131	5,726
Deferred revenue	1,416	1,191
Inventory	2,336	2,017
Research and development	2,733	2,341
Other	7,262	6,410
Total gross deferred income tax assets	160,596	138,186
Valuation allowance	(152,207)	(126,424)	$ (89,033)
Total deferred income tax assets	8,389	11,762
Deferred income tax liabilities:
Intangible assets	6,386	9,884
Property, plant and equipment	2,754	3,132
Other	774	650
Total deferred income tax liabilities	9,914	13,666
Total net deferred income tax liabilities	1,525	1,904
Allocated as follows:
Current deferred income tax assets	3,556	3,109
Current deferred income tax liabilities	(398)	(468)
Long-term deferred income tax assets	271	379
Long-term deferred income tax liabilities	(4,954)	(4,903)
Total net deferred income tax liabilities	$ (1,525)	$ (1,904)

Income taxes (Details 2)

Income taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Beginning balance	$ 126,424	$ 89,033
Additions	25,783	37,391
Reductions	0	0
Ending valuation allowance	$ 152,207	$ 126,424

Income taxes (Details 3)

Income taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income (loss) before income taxes	$ (150,197)	$ (184,537)	$ (97,036)
Current	606	1,414	2,147
Deferred	(1,185)	(541)	(409)
Total	(579)	873	1,738
CANADA
Net income (loss) before income taxes	(87,783)	(99,188)	(93,688)
Current	165	444	1,339
Deferred	301	89	53
Total	466	533	1,392
UNITED STATES
Net income (loss) before income taxes	(49,577)	(31,019)	(1,589)
Current	8	56	(62)
Deferred	0	(295)	0
Total	8	(239)	(62)
ITALY
Net income (loss) before income taxes	(3,834)	(27,247)	(318)
Current	521	836	775
Deferred	(1,463)	(311)	25
Total	(942)	525	800
Other [Member]
Net income (loss) before income taxes	(9,003)	(27,083)	(1,441)
Current	(88)	78	95
Deferred	(23)	(24)	(487)
Total	$ (111)	$ 54	$ (392)

Income taxes (Details 4)

Income taxes (Details 4) $ in Thousands	Dec. 31, 2014USD ($)
Operating Loss Carryforwards	$ 478,693,116
Expiring in 2015 [Member]
Operating Loss Carryforwards	0
Expiring in 2016 [Member]
Operating Loss Carryforwards	0
Expiring in 2017 [Member]
Operating Loss Carryforwards	0
Expiring In 2018 [Member]
Operating Loss Carryforwards	1,085,596
Expiring in 2019 [Member]
Operating Loss Carryforwards	6,725,731
Expiring in 2020 and Later [Member]
Operating Loss Carryforwards	470,881,789
CANADA
Operating Loss Carryforwards	387,553,717
CANADA | Expiring in 2015 [Member]
Operating Loss Carryforwards	0
CANADA | Expiring in 2016 [Member]
Operating Loss Carryforwards	0
CANADA | Expiring in 2017 [Member]
Operating Loss Carryforwards	0
CANADA | Expiring In 2018 [Member]
Operating Loss Carryforwards	0
CANADA | Expiring in 2019 [Member]
Operating Loss Carryforwards	0
CANADA | Expiring in 2020 and Later [Member]
Operating Loss Carryforwards	387,553,717
ITALY
Operating Loss Carryforwards	6,429,576
ITALY | Expiring in 2015 [Member]
Operating Loss Carryforwards	0
ITALY | Expiring in 2016 [Member]
Operating Loss Carryforwards	0
ITALY | Expiring in 2017 [Member]
Operating Loss Carryforwards	0
ITALY | Expiring In 2018 [Member]
Operating Loss Carryforwards	0
ITALY | Expiring in 2019 [Member]
Operating Loss Carryforwards	0
ITALY | Expiring in 2020 and Later [Member]
Operating Loss Carryforwards	6,429,576
UNITED STATES
Operating Loss Carryforwards	55,353,513
UNITED STATES | Expiring in 2015 [Member]
Operating Loss Carryforwards	0
UNITED STATES | Expiring in 2016 [Member]
Operating Loss Carryforwards	0
UNITED STATES | Expiring in 2017 [Member]
Operating Loss Carryforwards	0
UNITED STATES | Expiring In 2018 [Member]
Operating Loss Carryforwards	0
UNITED STATES | Expiring in 2019 [Member]
Operating Loss Carryforwards	0
UNITED STATES | Expiring in 2020 and Later [Member]
Operating Loss Carryforwards	55,353,513
SWEDEN
Operating Loss Carryforwards	13,710,864
SWEDEN | Expiring in 2015 [Member]
Operating Loss Carryforwards	0
SWEDEN | Expiring in 2016 [Member]
Operating Loss Carryforwards	0
SWEDEN | Expiring in 2017 [Member]
Operating Loss Carryforwards	0
SWEDEN | Expiring In 2018 [Member]
Operating Loss Carryforwards	0
SWEDEN | Expiring in 2019 [Member]
Operating Loss Carryforwards	0
SWEDEN | Expiring in 2020 and Later [Member]
Operating Loss Carryforwards	13,710,864
Other Jurisdictions [Member]
Operating Loss Carryforwards	15,645,446
Other Jurisdictions [Member] | Expiring in 2015 [Member]
Operating Loss Carryforwards	0
Other Jurisdictions [Member] | Expiring in 2016 [Member]
Operating Loss Carryforwards	0
Other Jurisdictions [Member] | Expiring in 2017 [Member]
Operating Loss Carryforwards	0
Other Jurisdictions [Member] | Expiring In 2018 [Member]
Operating Loss Carryforwards	1,085,596
Other Jurisdictions [Member] | Expiring in 2019 [Member]
Operating Loss Carryforwards	6,725,731
Other Jurisdictions [Member] | Expiring in 2020 and Later [Member]
Operating Loss Carryforwards	$ 7,834,119

Income taxes (Details 5)

Income taxes (Details 5) $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)
Beginning Balance	$ 0
Tax positions related to the current year:
Additions	0
Reductions	0
Increase Decrease related to the tax position current year	0
Tax positions related to prior years:
Additions	1,230
Reductions	0
Settlements	0
Lapses in statutes of limitations	0
Ending Balance	$ 1,230

Income taxes (Details Textual)

Income taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	26.00%	26.00%	25.00%
Unrecognized Tax Benefits	$ 1,230	$ 0

Related party transactions (Det

Related party transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Expenses incurred in transactions with related party	$ 6,486	$ 6,254	$ 6,464
Research and development [Member]
Expenses incurred in transactions with related party	3	178	160
General and administrative [Member]
Expenses incurred in transactions with related party	1,548	1,351	2,621
Sales and marketing [Member]
Expenses incurred in transactions with related party	$ 4,935	$ 4,725	$ 3,683

Related party transactions (102

Related party transactions (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Due from Related Parties	$ 2,538	$ 3,621
Related Party Transaction, Expenses from Transactions with Related Party	6,486	6,254	$ 6,464
Interest Expense [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 0	$ 0	$ 114

Service and other revenue (Deta

Service and other revenue (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
License and Services Revenue	$ 0	$ 0	$ 7,923
Sales Revenue, Services, Other	1,480	1,484	1,414
Service Revenue Recognized On Achievements Of Certain Milestones	$ 11,074	$ 14,547	$ 13,907

Commitments and contingencie104

Commitments and contingencies (Details) $ in Thousands	Dec. 31, 2014USD ($)
2,015	$ 3,946
2,016	4,978
2,017	5,890
2,018	4,969
2,019	4,960
Thereafter	33,125
Operating Leases, Future Minimum Payments Due	$ 57,868

Commitments and contingencie105

Commitments and contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leases, Rent Expense, Net, Total	$ 3,879	$ 5,675	$ 4,492
Guarantor Obligations, Current Carrying Value	298	342
Provision For Inventory Purchase Commitment	$ 4,106	$ 0	$ 0

Segmented information (Details)

Segmented information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Total segment revenues	$ 1,086,268	$ 941,263	$ 625,727
Less: equity investees' revenue	(955,699)	(777,231)	(470,101)
Total consolidated revenues	130,569	164,032	155,626
Total segment operating loss	(9,685)	(112,937)	(49,848)
Less: equity investees’ operating income	(100,057)	(38,035)	(45,133)
Net consolidated operating income (loss) excluding depreciation and amortization, losses on impairments, write-downs and disposals, provision for inventory purchase commitments, foreign exchange loss (gain), bank charges and other:	(109,742)	(150,972)	(94,981)
Depreciation and amortization:	18,666	16,288	11,395
Provision for inventory purchase commitments (On-Road Systems)	4,106	0	0
Losses on impairments, write-downs and disposals	52,376	57,811	11,395
Net consolidated operating loss excluding depreciation and amortization, losses on impairments, write-downs and disposals, provision for inventory purchase commitments, foreign exchange (gain) loss, bank charges and other:	(162,118)	(208,783)	(106,376)
Foreign exchange (gain) loss, bank charges and other	(2,731)	(14,573)	1,922
Loss from operations	(159,387)	(194,210)	(108,298)
Interest on long-term debt and other income (expenses), net	(5,032)	(3,771)	(4,928)
Income from investment accounted for by the equity method	14,222	13,444	16,190
Loss before income taxes	(150,197)	(184,537)	(97,036)
Westport Operations [Member]
Total segment revenues	126,988	151,615	132,382
Total segment operating loss	(22,379)	(67,426)	(44,770)
Depreciation and amortization:	13,573	11,474	9,016
Losses on impairments, write-downs and disposals	26,146	9,959	0
Cummins Westport Inc [Member]
Total segment revenues	337,234	310,651	198,015
Total segment operating loss	21,555	23,539	35,368
Corporate And Technology Investments [Member]
Total segment revenues	3,581	12,417	23,244
Total segment operating loss	(87,363)	(83,546)	(50,211)
Depreciation and amortization:	5,093	4,814	2,379
Losses on impairments, write-downs and disposals	3,458	31,564	0
Weichai Westport Inc [Member]
Total segment revenues	618,465	466,580	272,086
Total segment operating loss	$ 78,502	$ 14,496	$ 9,765

Segmented information (Details

Segmented information (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Total additions to long-lived assets excluding business combinations	$ 10,249	$ 26,450	$ 31,352
Westport Operations [Member]
Total additions to long-lived assets excluding business combinations	2,278	20,871	14,787
Corporate And Technology Investments [Member]
Total additions to long-lived assets excluding business combinations	$ 7,971	$ 5,579	$ 16,565

Segmented information (Detai108

Segmented information (Details 2)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Americas including United States [Member]
Concentration Risk, Percentage	40.00%	42.00%	38.00%
Asia including China [Member]
Concentration Risk, Percentage	12.00%	11.00%	9.00%
Other including Italy [Member]
Concentration Risk, Percentage	48.00%	47.00%	53.00%

Segmented Information (Detai109

Segmented Information (Details 3) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Assets Excluding Equity Investees Total Assets	$ 692,851	$ 738,160
Less: equity investees' total assets	355,156	246,489
Total consolidated assets	337,695	491,671
Westport Operations [Member]
Assets Excluding Equity Investees Total Assets	219,261	262,690
Corporate and Technology Investments and unallocated assets [Member]
Assets Excluding Equity Investees Total Assets	118,434	228,981
Cummins Westport Inc [Member]
Assets Excluding Equity Investees Total Assets	172,941	115,343
Weichai Westport Inc [Member]
Assets Excluding Equity Investees Total Assets	$ 182,215	$ 131,146

Segmented information (Detai110

Segmented information (Details 4) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment Excluding Equity Investees Long Lived Assets	$ 65,164	$ 75,466
Less: Equity Investees Long Lived Assets For Fixed Assets	7,030	8,117
Property, Plant and Equipment, Net	58,134	67,349
Intangible Assets Net Including Goodwill Excluding Equity Investees Long Lived Assets	51,272	79,844
Less: Equity Investees Long Lived Assets For Intangible Assets	0	0
Intangible Assets, Net (Including Goodwill)	51,272	79,844
Capital Assets, Intangible Assets and Goodwill Including Equity Investees Long Lived Assets	116,436	155,310
Less: equity investees’ long-lived assets	7,030	8,117
Capital Assets, Intangible Assets and Goodwill Excluding Equity Investees Long Lived Assets	109,406	147,193
Italy
Property Plant And Equipment Excluding Equity Investees Long Lived Assets	9,084	13,819
Intangible Assets Net Including Goodwill Excluding Equity Investees Long Lived Assets	44,139	53,099
Capital Assets, Intangible Assets and Goodwill Including Equity Investees Long Lived Assets	53,223	66,918
Netherlands
Property Plant And Equipment Excluding Equity Investees Long Lived Assets	3,729	0
Intangible Assets Net Including Goodwill Excluding Equity Investees Long Lived Assets	6,245	0
Capital Assets, Intangible Assets and Goodwill Including Equity Investees Long Lived Assets	9,974	0
Canada
Property Plant And Equipment Excluding Equity Investees Long Lived Assets	24,410	29,842
Intangible Assets Net Including Goodwill Excluding Equity Investees Long Lived Assets	673	871
Capital Assets, Intangible Assets and Goodwill Including Equity Investees Long Lived Assets	25,083	30,713
United States
Property Plant And Equipment Excluding Equity Investees Long Lived Assets	20,386	21,727
Intangible Assets Net Including Goodwill Excluding Equity Investees Long Lived Assets	0	25,595
Capital Assets, Intangible Assets and Goodwill Including Equity Investees Long Lived Assets	20,386	47,322
Sweden
Property Plant And Equipment Excluding Equity Investees Long Lived Assets	208	322
Intangible Assets Net Including Goodwill Excluding Equity Investees Long Lived Assets	0	0
Capital Assets, Intangible Assets and Goodwill Including Equity Investees Long Lived Assets	208	322
China
Property Plant And Equipment Excluding Equity Investees Long Lived Assets	6,329	8,675
Intangible Assets Net Including Goodwill Excluding Equity Investees Long Lived Assets	0	0
Capital Assets, Intangible Assets and Goodwill Including Equity Investees Long Lived Assets	6,329	8,675
Australia
Property Plant And Equipment Excluding Equity Investees Long Lived Assets	1,018	1,081
Intangible Assets Net Including Goodwill Excluding Equity Investees Long Lived Assets	214	279
Capital Assets, Intangible Assets and Goodwill Including Equity Investees Long Lived Assets	$ 1,232	$ 1,360

Segmented information (Detai111

Segmented information (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill	$ 23,352	$ 41,500	$ 56,879
Long-term Investments, Total	33,324	22,128
On-Road Systems [Member]
Goodwill	0
Corporate And Technology Investments [Member]
Long-term Investments, Total	32,898	21,872
Westport Operations [Member]
Goodwill	23,352	41,500
Long-term Investments, Total	$ 426	$ 256

Financial instruments (Details)

Financial instruments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)
Carrying amount	$ 135,338
Contractual cash flows	231,842
Contractual Obligation, Due in Next Twelve Months	73,867
Contractual Obligation, Due in Second and Third Year	98,783
Contractual Obligation, Due in Fourth and Fifth Year	13,356
Contractual Obligation, Due after Fifth Year	45,838
Capital Lease Obligations [Member]
Carrying amount	1,394
Contractual cash flows	1,490
Contractual Obligation, Due in Next Twelve Months	626
Contractual Obligation, Due in Second and Third Year	665
Contractual Obligation, Due in Fourth and Fifth Year	200
Contractual Obligation, Due after Fifth Year	0
Unsecured subordinated debentures [Member]
Carrying amount	46,491	[1]
Contractual cash flows	68,613	[1]
Contractual Obligation, Due in Next Twelve Months	4,950	[1]
Contractual Obligation, Due in Second and Third Year	63,663	[1]
Contractual Obligation, Due in Fourth and Fifth Year	0	[1]
Contractual Obligation, Due after Fifth Year	0	[1]
Senior financing [Member]
Carrying amount	15,910	[2]
Contractual cash flows	16,565	[2]
Contractual Obligation, Due in Next Twelve Months	6,314	[2]
Contractual Obligation, Due in Second and Third Year	8,353	[2]
Contractual Obligation, Due in Fourth and Fifth Year	779	[2]
Contractual Obligation, Due after Fifth Year	1,120	[2]
Senior revolving financing [Member]
Carrying amount	12,101	[3]
Contractual cash flows	12,743	[3]
Contractual Obligation, Due in Next Twelve Months	315	[3]
Contractual Obligation, Due in Second and Third Year	12,429	[3]
Contractual Obligation, Due in Fourth and Fifth Year	0	[3]
Contractual Obligation, Due after Fifth Year	0	[3]
Other bank financing [Member]
Carrying amount	2,646	[4]
Contractual cash flows	3,135	[4]
Contractual Obligation, Due in Next Twelve Months	1,050	[4]
Contractual Obligation, Due in Second and Third Year	478	[4]
Contractual Obligation, Due in Fourth and Fifth Year	121	[4]
Contractual Obligation, Due after Fifth Year	1,485	[4]
Operating lease commitments [Member]
Carrying amount	0
Contractual cash flows	57,867
Contractual Obligation, Due in Next Twelve Months	3,946
Contractual Obligation, Due in Second and Third Year	10,868
Contractual Obligation, Due in Fourth and Fifth Year	9,929
Contractual Obligation, Due after Fifth Year	33,125
Royalty payments [Member]
Carrying amount	1,294	[5]
Contractual cash flows	15,927	[5]
Contractual Obligation, Due in Next Twelve Months	1,164	[5]
Contractual Obligation, Due in Second and Third Year	2,327	[5]
Contractual Obligation, Due in Fourth and Fifth Year	2,327	[5]
Contractual Obligation, Due after Fifth Year	10,108	[5]
Accounts Payable and Accrued Liabilities [Member]
Carrying amount	55,502
Contractual cash flows	55,502
Contractual Obligation, Due in Next Twelve Months	55,502
Contractual Obligation, Due in Second and Third Year	0
Contractual Obligation, Due in Fourth and Fifth Year	0
Contractual Obligation, Due after Fifth Year	$ 0
[1]	Includes interest at 9%.
[2]	Includes interest at rates disclosed in note 13(b) in effect at December 31, 2014.
[3]	Includes interest at rates disclosed in note 13(c) in effect at December 31, 2014.
[4]	Includes interest at rates disclosed in note 13(d) in effect at December 31, 2014.
[5]	From fiscal 2011 to 2015 inclusive, the Company is obligated to pay annual royalties equal to the greater of $1,164 (CDN$1,350) or 0.33% of the Company's gross annual revenue from all sources, provided that gross revenue exceeds $12,693 (CDN$13,500) in any aforementioned fiscal year, up to a maximum of $26,514 (CDN$28,189). The Company has assumed the minimum required payments.

Financial instruments (Details

Financial instruments (Details 1) € in Thousands, $ in Thousands	Dec. 31, 2014USD ($)	Dec. 31, 2014EUR (€)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)	Dec. 31, 2011USD ($)
Cash and cash equivalents	$ 93,282		$ 178,513	$ 188,958	$ 63,285
Short-term investments	723		32,091
Accounts receivable	46,849		59,315
Accounts payable	55,502		$ 54,792
United States of America, Dollars
Cash and cash equivalents	69,899
Short-term investments	500
Accounts receivable	14,304
Accounts payable	$ 4,012
Euro Member Countries, Euro
Cash and cash equivalents | €		€ 9,190
Accounts receivable | €		38,916
Accounts payable | €		€ 27,667

Financial instruments (Detai114

Financial instruments (Details Textual) € in Thousands, CAD in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)	Dec. 31, 2014CAD	Dec. 31, 2014EUR (€)	Dec. 31, 2013USD ($)	Dec. 31, 2014CAD
Cash And Cash Equivalents, Short-Term Investments And Accounts Receivable	$ 140,854			$ 269,919
Cash, Cash Equivalents, and Short-term Investments, Total	94,005
Interest Rate Risk, Effect of Change in Exchange Rate by Fifty Basis Point on US Dollar Denominated, Financial Instruments	52
Foreign Currency Risk Effect Of Change In Exchange Rate By Twenty Five Basis Point On Euro Denominated Financial Instruments | €			€ 51
Foreign Currency Risk Effect Of Change In Exchange Rate By Twenty Five Basis Point On US Dollar Denominated Financial Instruments	$ 201
Debt Instrument, Interest Rate During Period	9.00%	9.00%	9.00%
Accounts Receivable [Member] | Customer Receivable [Member] | Credit Concentration Risk [Member]
Concentration Risk, Percentage	87.00%	87.00%	87.00%	88.00%
Accounts Receivable [Member] | Government Grants, Receivable [Member] | Credit Concentration Risk [Member]
Concentration Risk, Percentage	1.00%	1.00%	1.00%	1.00%
Accounts Receivable [Member] | Due from Partners and Indirect and Value Added Taxes Receivable [Member] | Credit Concentration Risk [Member]
Concentration Risk, Percentage	12.00%	12.00%	12.00%	11.00%
Maximum [Member]
Accounts Receivable, Credit Period	30 days	30 days	30 days
Minimum [Member]
Accounts Receivable, Credit Period				90 days
Royalty payments [Member] | Maximum [Member]
Contractual Obligations, Annual Royalty Payments	$ 26,514				CAD 28,189
Royalty payments [Member] | Minimum [Member]
Royalty Guarantees, Commitments, Amount	$ 1,164				CAD 1,350
Contractual Obligations, Annual Royalty Payments as Percentage of Gross Revenue, Option Two	0.33%	0.33%	0.33%
Contractual Obligation, Revenue for Payment of Royalty	$ 12,693	CAD 13,500