CDTi Advanced Materials (CDTI) 10-K 18 Mar 15 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Mar. 05, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	CLEAN DIESEL TECHNOLOGIES INC
Document Type	10-K
Current Fiscal Year End Date	-19
Entity Common Stock, Shares Outstanding		14,152,772
Entity Public Float			$32,238,000
Amendment Flag	FALSE
Entity Central Index Key	949428
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash	$7,220	$3,909
Accounts receivable, net	2,875	5,145
Inventories	6,298	5,285
Prepaid expenses and other current assets	2,130	1,428
Assets of discontinued operations held for sale		1,047
Total current assets	18,523	16,814
Property and equipment, net	1,357	1,372
Intangible assets, net	2,662	3,438
Goodwill	5,177	5,584
Other assets	620	718
Assets of discontinued operations held for sale		443
Total assets	28,339	28,369
Current liabilities:
Line of credit	2,841	2,258
Accounts payable	3,022	5,087
Accrued expenses and other current liabilities	6,189	5,859
Income taxes payable	1,459	1,058
Liabilities of discontinued operations held for sale		426
Total current liabilities	13,511	14,688
Shareholder notes payable, noncurrent	7,476	7,549
Deferred tax liability	359	686
Total liabilities	21,346	22,923
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, par value $0.01 per share: authorized 100,000; no shares issued and outstanding
Common stock, par value $0.01 per share: authorized 24,000,000; issued and outstanding 14,152,772 and 9,299,253 shares at December 31, 2014 and 2013, respectively	142	93
Additional paid-in capital	200,771	188,108
Accumulated other comprehensive loss	-2,865	-1,036
Accumulated deficit	-191,055	-181,719
Total stockholders’ equity	6,993	5,446
Total liabilities and stockholders’ equity	$28,339	$28,369

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Preferred stock par value (in Dollars per share)	$0.01	$0.01
Preferred stock, shares authorized	100,000	100,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$0.01	$0.01
Common stock, shares authorized	24,000,000	24,000,000
Common stock, shares issued	14,152,772	9,299,253
Common stock, shares outstanding	14,152,772	9,299,253

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Revenues	$41,231	$51,801
Cost of revenues	28,778	36,840
Gross profit	12,453	14,961
Operating expenses:
Selling, general and administrative (including stock-based compensation expense of $592 and $661, respectively)	12,374	13,339
Research and development (including stock-based compensation expense of $47 and $6, respectively)	6,538	4,726
Severance and other charges	1,166	1,239
Total operating expenses	20,078	19,304
Loss from continuing operations	-7,625	-4,343
Other expense:
Interest expense	-1,176	-1,404
Other expense, net	-174	-756
Total other expense	-1,350	-2,160
Loss from continuing operations before income taxes	-8,975	-6,503
Income tax expense from continuing operations	138	340
Net loss from continuing operations	-9,113	-6,843
Net loss from discontinued operations	-223	-255
Net loss	-9,336	-7,098
Foreign currency translation adjustments	-1,829	-924
Comprehensive loss	($11,165)	($8,022)
Basic and diluted net loss per share:
Net loss from continuing operations (in Dollars per share)	($0.76)	($0.83)
Net loss from discontinued operations (in Dollars per share)	($0.02)	($0.03)
Net loss (in Dollars per share)	($0.78)	($0.86)
Weighted-average number of common shares outstanding - basic and diluted (in Shares)	12,005	8,285

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Loss (Parentheticals) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	$592	$661
Research and Development Expense [Member]
Stock-based compensation expense	$47	$6

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders` Equity (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total
In Thousands, except Share data
Balance at Dec. 31, 2012	$73	$186,106	($112)	($174,621)	$11,446
Balance (in Shares) at Dec. 31, 2012	7,254,000
Net loss				-7,098	-7,098
Other comprehensive loss			-924		-924
Proceeds from equity offerings, net of costs	17	1,106			1,123
Proceeds from equity offerings, net of costs (in Shares)	1,730,000
Proceeds from private placement		99			99
Proceeds from private placement (in Shares)	54,000
Issuance of common stock as payment of accrued interest and payment premium on shareholder note	2	160			162
Issuance of common stock as payment of accrued interest and payment premium on shareholder note (in Shares)	188,000
Restricted stock unit vesting	1				1
Restricted stock unit vesting (in Shares)	73,000
Restricted stock units withheld for taxes		-4			-4
Stock-based compensation		641			641
Balance at Dec. 31, 2013	93	188,108	-1,036	-181,719	5,446
Balance (in Shares) at Dec. 31, 2013	9,299,000
Net loss				-9,336	-9,336
Other comprehensive loss			-1,829		-1,829
Proceeds from equity offerings, net of costs	34	7,346			7,380
Proceeds from equity offerings, net of costs (in Shares)	3,415,000
Issuance of common stock for settlement of litigation	1	235			236
Issuance of common stock for settlement of litigation (in Shares)	75,000
Exercise of warrants	10	3,938			3,948
Exercise of warrants (in Shares)	968,000
Exercise of stock options	2	523			525
Exercise of stock options (in Shares)	179,000
Restricted stock unit vesting	2				2
Restricted stock unit vesting (in Shares)	217,000
Restricted stock units withheld for taxes		-18			-18
Stock-based compensation		639			639
Balance at Dec. 31, 2014	$142	$200,771	($2,865)	($191,055)	$6,993
Balance (in Shares) at Dec. 31, 2014	14,153,000

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Net loss	($9,336)	($7,098)
Net loss from discontinued operations	223	255
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	1,007	1,193
Write-down of excess and obsolete inventory	4	491
Stock-based compensation expense	639	667
Loss on change in fair value of liability-classified warrants	506	180
Loss (income) from unconsolidated affiliates	-46	561
Loss (gain) on foreign currency transactions	-878	16
Loss related to litigation	123
Loss (gain) on disposal of property and equipment	-294	18
Offering costs allocated to warrants issued	293	123
Other	-177	77
Changes in operating assets and liabilities:
Accounts receivable	2,024	-450
Inventories	-1,359	2,037
Prepaid expenses and other assets	-83	-149
Accounts payable	-1,932	-186
Income taxes	-189	1,057
Accrued expenses and other current liabilities	-442	385
Cash used in operating activities of continuing operations	-9,917	-823
Cash provided by (used in) operating activities of discontinued operations	-15	392
Net cash used in operating activities	-9,932	-431
Cash flows from investing activities:
Distribution from (investment in) unconsolidated affiliate	91	-710
Purchases of property and equipment	-454	-135
Proceeds from sale of business held for sale	1,328
Proceeds from sale of property and equipment	307
Cash provided by (used in) investing activities of continuing operations	1,272	-845
Cash used in investing activities of discontinued operations	-8	-7
Net cash provided by (used in) investing activities	1,264	-852
Cash flows from financing activities:
Net borrowings (payments) under demand line of credit	584	-3,217
Proceeds from issuance of common stock and warrants, net of offering costs	9,923	1,839
Proceeds from exercise of warrants	1,000
Proceeds from exercise of stock options	525
Other	-18	-4
Net cash provided by (used in) financing activities	12,014	-1,382
Effect of exchange rates on cash	-35	-304
Net change in cash	3,311	-2,969
Cash at beginning of year	3,909	6,878
Cash at end of year	7,220	3,909
Supplemental disclosures:
Cash paid for interest	1,107	1,193
Cash paid (received) for income taxes	879	-372
Significant noncash financing activities:
Issuance of warrants classified as derivative liability	$2,978	$749

Organization

Organization	12 Months Ended
	Dec. 31, 2014
Disclosure Text Block [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1.       Organization
	a.       Description of Business
	Clean Diesel Technologies, Inc. (“CDTi” or the “Company”) currently commercializes its material technology by manufacturing and distributing light duty vehicle catalysts and heavy duty diesel emissions control systems and products to major automakers, distributors, integrators and retrofitters. Further, CDTi is evolving from being a niche manufacturer of emissions control solutions for the automotive original equipment manufacturer, retrofit and aftermarket markets to becoming an advanced materials technology provider for these markets. CDTi’s business is driven by increasingly stringent global emission standards for internal combustion engines, which are major sources of a variety of harmful pollutants. It has operations in the United States (“U.S.”), Canada, the United Kingdom (“U.K.”), France, Japan and Sweden as well as an Asian investment.
	b.       Liquidity
	The accompanying consolidated financial statements have been prepared assuming the Company will continue as a going concern. Therefore, the consolidated financial statements contemplate the realization of assets and liquidation of liabilities in the ordinary course of business. The Company has suffered recurring losses and negative cash flows from operations since inception, resulting in an accumulated deficit of $191.1 million at December 31, 2014. The Company has funded its operations through asset sales, credit facilities and other borrowings and equity sales.
	The Company has a $7.5 million secured demand facility backed by its receivables and inventory with Faunus Group International, Inc. (“FGI”). At December 31, 2014, the Company had $2.8 million in borrowings outstanding under this facility with $4.7 million available, subject to the availability of eligible accounts receivable and inventory balances for collateral. There is no guarantee that the Company will be able to borrow to the full limit of $7.5 million if FGI chooses not to finance a portion of its receivables or inventory. Additionally, FGI can cancel the facility at any time. For additional information, refer to Note 9, “Debt”.
	On May 15, 2012, the Company filed a shelf registration statement on Form S-3 with the Securities and Exchange Commission (“SEC”) (the “Shelf Registration”), which permits the Company to sell, from time to time, up to an aggregate of $50.0 million of various securities. However, the Company may not sell its securities in a primary offering pursuant to the Shelf Registration or any other registration statement on Form S-3 with a value exceeding one-third of its public float in any 12-month period, unless the Company’s public float rises to $75.0 million or more. For additional information, refer to Note 10, “Stockholders’ Equity”.
	On July 3, 2013, the Company sold 1,730,000 units pursuant to the Shelf Registration for $1.25 per unit, with each unit consisting of one share of common stock and one half of a warrant to purchase one share of common stock with an exercise price of $1.25 per share. The Company received net proceeds of $1.7 million after deducting discounts and commissions to the underwriter and offering expenses. In the first quarter of 2014, warrant holders exercised an aggregate of 800,000 of the warrants issued in the offering at an exercise price of $1.25 per share for proceeds of $1.0 million. For additional information, refer to Note 10, “Stockholders’ Equity” and Note 11, “Warrants”.
	On April 4, 2014, the Company sold 2,030,000 units pursuant to the Shelf Registration for $3.40 per unit, with each unit consisting of one share of common stock and 0.4 of one warrant to purchase one share of common stock with an exercise price of $4.20 per share. The Company received net proceeds of $6.1 million after deducting placement agent fees and other offering expenses. For additional information, refer to Note 10, “Stockholders’ Equity” and Note 11, “Warrants”.
	On October 20, 2014, the Company completed the sale of its Reno, Nevada-based custom fabricated exhaust parts and accessories business (the “Reno Business”) for $1.3 million in cash. For additional information, refer to Note 2, “Significant Accounting Policies”, Note 9, “Debt” and Note 18, “Discontinued Operations”.
	On November 4, 2014, the Company sold 1,385,000 shares of common stock, warrants to purchase up to an aggregate of 388,393 shares of common stock with an exercise price of $3.25 per share (the “Series A Warrants”), for a combined purchase price of $2.80 per share and 0.28 of one Series A Warrant and other warrants to purchase up to an aggregate of 168,571 shares of common stock with an exercise price of $0.01 per share (the “Series B Warrants”) for a purchase price of $2.79 per Series B Warrant, pursuant to the Shelf Registration. The Company received net proceeds of $3.8 million after deducting placement agent fees and other estimated offering expenses. For additional information, refer to Note 10, “Stockholders’ Equity” and Note 11, “Warrants”.
	On November 11, 2014, the Company and Kanis S.A. entered into a letter agreement whereby Kanis S.A. agreed to amend the terms of the outstanding loans made to the Company, such that (i) the maturity dates of all outstanding loans were extended to October 1, 2016; and (ii) the early redemption feature applicable to one of the outstanding loans was removed. For additional information, refer to Note 9, “Debt”.
	At December 31, 2014, the Company had $7.2 million in cash. Based on the Company’s current cash levels and expected cash flows from operations, management believes that the current cash position is not sufficient to fund the Company’s cash requirements during the next twelve months. The Company’s credit facility with FGI is a demand facility, which can be cancelled at any time by FGI. As such, the Company may be forced to seek additional financing in the form of funding from outside sources. However, there is no assurance that the Company will be able to raise additional funds or reduce its discretionary spending to a level sufficient for its working capital needs. These matters raise substantial doubt about the Company’s ability to continue as a going concern.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	2.       Significant Accounting Policies
	a.       Principles of Consolidation
	The consolidated financial statements include the financial statements of the Company and its wholly owned subsidiaries. All significant inter-company balances and transactions have been eliminated in consolidation.
	Investments in which the Company has at least a 20%, but not more than a 50% interest are generally accounted for under the equity method. Investment interests below 20% are generally accounted for under the cost method, except if the Company could exercise significant influence, the investment would be accounted for under the equity method. The Company’s judgment regarding the level of influence over each equity method investment includes considering key factors such as the Company’s ownership interest, representation on the board of directors, participation in policy-making decisions and material intercompany transactions. The Company has an investment interest below 20% which is accounted for under the equity method. The Company includes its proportionate share of the net income or loss of equity-method investees in its consolidated statements of comprehensive loss. For additional information, refer to Note 15, “Equity Investments”.
	b.       Discontinued Operations
	In July 2014, the Company committed to a plan to sell substantially all of the assets of its Reno Business, and the sale of this business was completed in October 2014. The sale of this non-core business is expected to increase the Company’s ability to fund key investments to broaden its growing intellectual property portfolio and to bring to market new products. The assets and liabilities of the Reno Business have been reclassified as held for sale and its operations are classified as discontinued operations for all periods presented in this report. Depreciation and amortization have been eliminated from discontinued operations from the date the Company committed to the plan to sell the Reno Business. In the statements of cash flows, the cash flows of discontinued operations are separately classified and aggregated.
	Discontinued operations also includes accruals and related costs for the Company’s estimated liability to settle its ongoing indemnification matters with Johnson Matthey (“JM”) associated with the sale of Applied Utility Systems, Inc. (“AUS”), a former subsidiary of the Company, in 2009.
	For additional information, refer to Note 18, “Discontinued Operations”.
	All discussions and amounts in the consolidated financial statements and related notes for all periods presented relate to continuing operations only, unless otherwise noted.
	c.        Concentration of Risk
	For the years ended December 31, 2014 and 2013, one automotive original equipment manufacturer (“OEM”) customer within the Catalyst segment accounted for 52% and 41%, respectively, of the Company’s revenues. This customer accounted for 50% and 26% of the Company’s accounts receivable at December 31, 2014 and 2013, respectively.
	For the periods presented below, certain vendors accounted for 10% or more of the Company’s raw material purchases as follows:
				Years Ended
				December 31,
	Vendor		Supplies	2014		2013
	A		Substrates	27%		18%
	B		Substrates	14%		14%
	C		Catalysts	10%		15%
	D		Rare Earth Materials	9%		12%
	d.       Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management of the Company to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. These estimates and assumptions are based on management’s best estimates and judgment. On an ongoing basis, the Company evaluates its estimates and assumptions, including those related to impairment of goodwill and long-lived assets, stock-based compensation, the fair value of financial instruments including warrants, allowance for doubtful accounts, inventory valuation, taxes and contingent and accrued liabilities. The Company bases its estimates on historical experience and various other factors, including the current economic environment, which it believes to be reasonable under the circumstances. Estimates and assumptions are adjusted when facts and circumstances dictate. Actual results may differ from these estimates under different assumptions and conditions. Management believes that the estimates are reasonable.
	e.        Cash
	Cash consists of cash balances on hand and on deposit at banks. Cash on deposit at banks at times may exceed the FDIC limits. The Company believes no significant concentration of credit risk exists with respect to these cash balances.
	f.         Accounts Receivable
	Accounts receivable are recorded at the invoiced amount and do not bear interest. Accounts receivable are presented net of a reserve for doubtful accounts of $0.3 million and $0.4 million at December 31, 2014 and 2013, respectively. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in the Company’s existing accounts receivable. The Company determines the allowance based on historical write-off experience and past due balances over 90 days that are reviewed individually for collectability. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. The Company does not have any off balance sheet credit exposure related to its customer.
	g.       Inventories
	Inventories are stated at the lower of cost (FIFO method) or market (net realizable value). Finished goods inventory includes materials, labor and manufacturing overhead. The Company establishes provisions for inventory that is obsolete or when quantities on hand are in excess of estimated forecasted demand. The creation of such provisions results in a write-down of inventory to net realizable value and a charge to cost of sales.
	The Company’s inventory includes precious metals (platinum, palladium and rhodium) for use in the manufacturing of catalysts. The precious metals are valued at the lower of cost or market, consistent with the Company’s other inventory.
	h.       Property and Equipment
	Property and equipment is capitalized at cost and is stated at cost less accumulated depreciation and amortization. Depreciation and amortization is determined using the straight line method over the estimated useful lives of the various asset classes. Machinery and equipment are depreciated over 2 to 10 years; furniture and fixtures, computer hardware and software and vehicles are depreciated over 2 to 5 years. Property and equipment held under capital leases and leasehold improvements are amortized over the shorter of estimated useful lives or the lease term. Repairs and maintenance are charged to expense as incurred and major replacements or betterments are capitalized.
	i.         Goodwill and Intangible Assets
	Goodwill is the excess of the purchase price of an acquired entity over the fair value of net identified tangible and intangible assets acquired and is recorded in the reporting unit (operating segment or one level below operating segment) that is expected to benefit from the business combination. Goodwill is not amortized, but rather tested for impairment at least annually or more often whenever events or circumstances indicate that goodwill might be impaired. The Company performs its annual impairment test as of October 31.
	Goodwill is tested at the reporting unit level using a two-step impairment test. The first step is to compare the fair value of the reporting unit to its carrying value, including goodwill. If the carrying value of the reporting unit exceeds the fair value, a second step is performed in order to determine the amount of impairment loss, if any. The second step compares the implied fair value of the reporting unit’s goodwill with the carrying amount of that goodwill. If the carrying amount of the reporting unit’s goodwill exceeds its implied fair value, an impairment charge is recognized in an amount equal to that excess. Prior to performing the two-step impairment test, the Company may make a qualitative assessment of the likelihood of goodwill impairment in order to determine whether a detailed quantitative analysis is required.
	The Company’s Engine Control Systems reporting unit, which is within its Heavy Duty Diesel Systems reporting segment, contains all of the Company’s allocated goodwill. The Company performed Step 1 of the annual impairment test as of October 31, 2014 and determined that the fair value of the Company’s reporting unit (as determined using income and market approaches) was substantially greater than the carrying amount of the respective reporting unit, including goodwill, and Step 2 was not necessary; therefore, there was no impairment to the carrying amount of the reporting unit’s goodwill. The Company has recorded no impairment charges to date for this goodwill. The Company also determined that no subsequent events through December 31, 2014 triggered additional impairment testing; however, it is reasonably possible that future impairment tests may result in a different conclusion for the goodwill of the Engine Control Systems reporting unit. The estimate of fair value of the reporting units is sensitive to certain factors including but not limited to the following: movements in the Company’s share price, changes in discount rates and its cost of capital, growth of the reporting unit’s revenue, cost structure of the reporting unit, successful completion of research and development and customer acceptance of new products, expected changes in emissions regulations and approval of the reporting unit’s product by regulatory agencies.
	The Company’s intangible assets consist of trade names, acquired patents and technology, and customer relationships and have finite lives. Intangible assets are carried at cost, less accumulated amortization. Amortization is computed on a straight-line or accelerated basis over the estimated useful lives of the respective assets, ranging from 4 to 20 years.
	j.         Long Lived Assets
	Assets such as property and equipment and amortizable intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss is recognized when the sum of the expected undiscounted future net cash flows of an asset or asset group is less than its carrying amount and is measured as the amount by which the carrying amount of the asset or asset group exceeds its fair value.
	k.       Warrants and Derivative Liabilities
	The Company accounts for the issuance of Company derivative equity instruments in accordance with Accounting Standards Codification (“ASC”) 815-40 “Derivative and Hedging”. The Company reviews common stock purchase warrants at each balance sheet date based upon the characteristics and provision of each particular instrument and classifies them on the balance sheet as:
	·         Equity if they (i) require physical settlement or net-share settlement, or (ii) give the Company a choice of net-cash settlement or settlement in the Company’s own shares (physical settlement or net-share settlement), or as
	·         Liabilities if they (i) require net-cash settlement (including a requirement to net-cash settle the contract if an event occurs and if that event is outside the Company’s control), or (ii) give the counterparty a choice of net-cash settlement or settlement in shares (physical settlement of net-share settlement).
	The Company assesses classification of common stock purchase warrants and other freestanding derivatives at each reporting date to determine whether a change in classification between assets and liabilities and equity is required.
	l.         Income Taxes
	Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance against deferred tax assets is required if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The valuation allowance should be sufficient to reduce the deferred tax assets to the amount that is more likely than not to be realized.
	The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Changes in recognition or measurement are reflected in the period in which the change occurs. The Company records interest and penalties related to unrecognized tax benefit in income tax expense.
	m.      Revenue Recognition
	Revenues are derived primarily from the sale of products. The Company generally recognizes revenue when products are shipped and the customer takes ownership and assumes risk of loss, collection of the relevant receivable is reasonably assured, persuasive evidence of an arrangement exists and the sales price is fixed or determinable. There are certain customers where risk of loss transfers at destination point and revenue is recognized when product is delivered to the destination. For these customers, revenue is recognized upon receipt at the customer’s warehouse. When terms of sale include subjective customer acceptance criteria, the Company defers revenue until the acceptance criteria are met. The determination of whether or not the customer acceptance terms are perfunctory or inconsequential impacts the amount and timing of the revenue recognized.
	n.       Cost of Revenue
	Cost of revenue includes direct material costs and factory labor as well as factory overhead expense. Indirect factory expense includes the costs of freight (inbound and outbound for direct materials and finished goods, respectively), purchasing and receiving, inspection, testing, warehousing, utilities and depreciation of facilities and equipment utilized in the production and distribution of products.
	o.       Selling, General and Administrative Expense
	Selling, general and administrative expense includes the salary and benefits for sales, marketing and administrative staff as well as samples provided at no-cost to customers, marketing materials, travel, legal, accounting and tax consulting. Also included is any depreciation related to assets utilized in selling, general and administrative functions as well as amortization of acquired intangible assets.
	p.       Research and Development
	Research and development costs are generally expensed as incurred. These expenses include the salary and benefits for the research and development staff as well as travel, research materials, testing and legal expense related to patenting intellectual property. Also included is any depreciation related to assets utilized in the development of new products.
	q.       Stock-Based Compensation
	Equity awards consist of stock options and restricted stock units (“RSUs”). The Company measures the compensation cost for all stock-based awards at fair value on the date of grant and recognizes it on a straight-line basis over the service period for awards expected to vest, which is generally three years.
	The Company measures the fair value of stock options using the Black-Scholes option-pricing model and certain assumptions, including the expected life of the stock options, an expected forfeiture rate and the expected volatility of its common stock. The fair value of RSUs is based on the closing price of the Company’s common stock on the grant date.
	r.        Product Warranty
	The Company provides for the estimated cost of product warranties in cost of sales, at the time product revenue is recognized. Warranty costs are estimated primarily using historical warranty information in conjunction with current engineering assessments applied to the Company’s expected repair or replacement costs.
	s.        Foreign Currency
	The functional currency of the Heavy Duty Diesel Systems division’s Engine Control Systems Limited subsidiary in Canada is the Canadian dollar, while that of its subsidiary Engine Control Systems Europe AB in Sweden is the Swedish krona and the division’s Clean Diesel Technologies Limited U.K. subsidiary, is the British pound sterling. The functional currency of the Catalyst division’s Japanese branch office and Asian investment is the Japanese Yen. Accordingly, the assets and liabilities of the foreign locations are translated into U.S. dollars at period-end exchange rates. Revenue and expense accounts are translated at the average exchange rates for the period. The resulting foreign currency exchange adjustments are charged or credited directly to other comprehensive income or loss as a separate component of stockholders’ equity. Unrealized foreign currency exchange gains and losses on certain intercompany transactions that are of a long-term investment nature (i.e. settlement is not planned or anticipated in the foreseeable future) are also recorded in other comprehensive income or loss in stockholders’ equity. Accumulated other comprehensive loss contained only foreign currency translation adjustments as of December 31, 2014 and 2013.
	The Company has exposure to multiple currencies. The primary exposure is between the U.S. dollar, the Canadian dollar, the Euro, British pound sterling and Swedish krona. Gains and losses arising from transactions denominated in currencies other than the functional currency of the entity are included in other income (expense) in the consolidated statements of comprehensive loss. Gains and losses arising from transactions denominated in foreign currencies are primarily related to inter-company loans that have been determined to be temporary in nature, cash, accounts receivable and accounts payable denominated in non-functional currencies.
	t.         Net Loss per Share
	Basic net loss per share is computed using the weighted average number of common shares outstanding during the period. Diluted net loss per share is computed using the weighted average number of common shares and dilutive potential common shares. Dilutive potential common shares include employee stock options, RSUs, warrants and debt that are convertible into the Company’s common stock.
	Diluted net loss per share excludes certain dilutive potential common shares outstanding as their effect is anti-dilutive. Because the Company incurred net losses in the years ended December 31, 2014 and 2013, the effect of potentially dilutive securities has been excluded in the computation of net loss per share as their impact would be anti-dilutive. Potentially dilutive common stock equivalents excluded were 2.3 million and 2.6 million shares during the years ended December 31, 2014 and 2013, respectively.
u.       Fair Value Measurements
Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset and liability. As a basis for considering such assumptions, a fair value hierarchy has been established that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurement) and the lowest priority to unobservable inputs (level 3 measurements). The three levels of the fair value hierarchy are as follows:
·         Level 1: Quoted prices (unadjusted) in active markets for identical assets or liabilities;
·         Level 2: Inputs other than quoted prices included within Level 1 that are either directly or indirectly observable including quoted prices for similar instruments in active markets and quoted prices for identical or similar instruments in markets that are not active; and
·         Level 3: Unobservable inputs in which little or no market activity exists, therefore requiring an entity to develop its own assumptions about the assumptions that market participants would use in pricing.
The Company records its liability-classified warrants at fair value in accordance with the fair value measurement framework. The valuation inputs hierarchy classification for the warrant liability measured at fair value on a recurring basis is summarized as follows (in thousands):
Warrant Liability		Level 1	Level 2		Level 3
31-Dec-14		-	-		$	1,474
31-Dec-13		-	-		$	939
The following is a reconciliation of the warrant liability measured at fair value using Level 3 inputs (in thousands):
Years Ended
	December 31,
2014		2013
Balance at beginning of period	$	939	$	10
Issuance of common stock warrants		2,978		749
Exercise of common stock warrants		-2,949		-
Remeasurement of common stock warrants		506		180
Balance at end of period	$	1,474	$	939
For additional information regarding the liability-classified warrants, refer to Note 11, “Warrants”.
v.        Fair Value of Financial Instruments
ASC Topic 825, “Financial Instruments”,  requires disclosure of the fair value of financial instruments for which the determination of fair value is practicable. The fair values of the Company’s cash, trade accounts receivable, prepaid expenses and other current assets, accounts payable and accrued expenses and other current liabilities approximate carrying values due to the short maturity of these instruments. The fair value of borrowings under the line of credit approximates their carrying value due to the variable interest rates. The fair value of shareholder notes payable, calculated using level 3 inputs, including a Black-Scholes option-pricing model to value the debt’s conversion factor and a net present value model, was $7.7 million and $7.5 million at December 31, 2014 and 2013, respectively.
w.      Reclassifications
Certain prior-period amounts have been reclassified to conform to the current period presentation. These changes had no impact on the previously reported consolidated results of operations or stockholders' equity.
x.       Recently Issued Accounting Guidance
In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, "Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity". ASU 2014-08 raises the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. It is effective for annual reporting periods beginning on or after December 15, 2014. Early adoption is permitted but only for disposals that have not been reported in financial statements previously issued. The Company has not elected to early adopt, and it does not expect the impact of the adoption of ASU 2014-08 to be material to its consolidated financial statements.
In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers". ASU 2014-09 supersedes the revenue recognition requirements in "Revenue Recognition (Topic 605)". ASU 2014-09 requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. It is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. ASU 2014-09 provides for either full retrospective adoption or a modified retrospective adoption by which it is applied only to the most current period presented. Early adoption is not permitted. The Company is currently in the process of evaluating the impact of the adoption of ASU 2014-09 on its consolidated financial statements.
In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements-Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern”. ASU 2014-15 defines management's responsibility to assess an entity's ability to continue as a going concern, and to provide related footnote disclosures in certain circumstances. It is effective for annual reporting periods ending after December 15, 2016, and for annual and interim reporting periods thereafter. Early adoption is permitted. The Company is currently in the process of evaluating the impact of the adoption of ASU 2014-15 on its consolidated financial statements.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventory Disclosure [Text Block]	3.       Inventories
	Inventories consist of the following (in thousands):
	December 31,
	2014		2013
	Raw materials	$	2,744	$	2,637
	Work in process		902		981
	Finished goods		2,652		1,667
	Inventories	$	6,298	$	5,285

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	4.       Property and Equipment
	Property and equipment consists of the following (in thousands):
	December 31,
	2014		2013
	Buildings and improvements	$	233	$	676
	Furniture and fixtures		2,242		2,335
	Computer hardware and software		1,398		1,430
	Machinery and equipment		11,796		11,591
	Vehicles		58		37
	Property and equipment, Gross		15,727		16,069
	Less accumulated depreciation		-14,370		-14,697
	Property and equipment, Net	$	1,357	$	1,372
	Depreciation expense was $0.4 million and $0.5 million for the years ended December 31, 2014 and 2013, respectively.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	5.       Goodwill and Intangible Assets
	Goodwill
	The Company’s Engine Control Systems reporting unit, which is within its Heavy Duty Diesel Systems reporting segment, contains all of the Company’s allocated goodwill. The changes in the carrying amount of goodwill are as follows (in thousands):
	31-Dec-12	$	5,801
	Effect of translation adjustment		-217
	31-Dec-13		5,584
	Effect of translation adjustment		-407
	31-Dec-14	$	5,177
	Intangible Assets
	Intangible assets consist of the following (in thousands):
		Useful Life
		in Years		December 31,
		2014		2013
	Trade name	15 - 20		$	1,293	$	1,352
	Patents and know-how	12-May			4,529		4,814
	Customer relationships	8-Apr			837		940
	Intangible assets, Gross				6,659		7,106
	Less accumulated amortization				-3,997		-3,668
	Intangible assets, Net			$	2,662	$	3,438
	Amortization expense was $0.6 million and $0.7 million for the years ended December 31, 2014 and 2013, respectively. Estimated amortization expense for existing intangible assets for each of the next five years is as follows (in thousands):
	Years ending December 31
	2015	$	594
	2016	$	492
	2017	$	482
	2018	$	166
	2019	$	166

Accrued_Expenses_and_Other_Cur

Accrued Expenses and Other Current Liabilities	12 Months Ended
	Dec. 31, 2014
Accrued Expenses And Other Current Liabilities [Abstract]
Accrued Expenses And Other Current Liabilities [Text Block]	6.       Accrued Expenses and Other Current Liabilities
	Accrued expenses and other current liabilities consist of the following (in thousands):
	December 31,
	2014		2013
	Accrued salaries and benefits	$	1,115	$	1,146
	Accrued severance and other charges (1)		602		530
	Accrued legal settlement and related expenses (1)		-		616
	Accrued warranty (2)		373		453
	Warrant liability (3)		1,474		939
	Accrued indemnification settlement (4)		650		235
	Liability for consigned precious metals		565		832
	Other		1,410		1,108
	Accrued expenses and other current liabilities	$	6,189	$	5,859
	(1) For additional information, refer to Note 7, "Severance and Other Charges".
	(2) For additional information, refer to Note 8, "Accrued Warranty".
	(3) For additional information, refer to Note 11, "Warrants".
	(4) For additional information, refer to Note 18, "Discontinued Operations".

Severance_and_Other_Charges

Severance and Other Charges	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring and Related Activities Disclosure [Text Block]	7.       Severance and Other Charges
	Severance and other charges consist of the following (in thousands):
		Years Ended
		December 31,
		2014		2013
	Employee severance expense	$	784	$	596
	Lease exit costs		117		27
	Legal settlements (1)		265		616
	Total severance and other charges	$	1,166	$	1,239
	(1) For additional information, refer to Note 16, "Commitments and Contingencies".
	Additionally, the Company also incurred $0.1 million related to the settlement
	of a customer dispute during the year ended December 31, 2014.
	The Company incurred severance costs in 2013 related to its North American, European and Asian locations, including severance benefits covering a one year period for its former chief executive officer, pursuant to a separation and release agreement. The Company also incurred lease termination costs related to the exit of a lease in North America and asset impairment expense related to the exit of this facility as well as to the exit of a leased facility in the U.K.
	The Company incurred severance costs in 2014 related to its North American and U.K. locations, including severance benefits covering a one year period for its former chief financial officer, pursuant to a separation and release agreement. The Company incurred additional lease exit costs related to the exit of leases in North America.
	The following summarizes the activity in the Company’s accrual for severance and other exit costs (in thousands):
				Lease Exit
		Severance		Costs		Total
	31-Dec-12	$	306	$	184	$	490
	Provision		596		27		623
	Payments		-372		-211		-583
	31-Dec-13	$	530	$	-	$	530
	Provision		784		117		901
	Payments		-791		-38		-829
	31-Dec-14	$	523	$	79	$	602
	The Company expects to pay all of these amounts during the year ended December 31, 2015.

Accrued_Warranty

Accrued Warranty	12 Months Ended
	Dec. 31, 2014
Product Warranties Disclosures [Abstract]
Product Warranty Disclosure [Text Block]	8.       Accrued Warranty
	Accrued warranty is as follows (in thousands):
		Years Ended
		December 31,
		2014		2013
	Balance at beginning of period	$	453	$	665
	Accrued warranty expense		480		540
	Warranty claims paid		-524		-707
	Translation adjustment		-36		-45
	Balance at end of period	$	373	$	453

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	9.       Debt
	Debt consists of the following (in thousands):
			December 31,		December 31,
			2014		2013
	Line of credit with FGI		$	2,841	$	2,258
	$1.5 million, 8% shareholder note due 2016 (1)			1,598		1,586
	$3.0 million, 8% subordinated convertible shareholder notes due 2016 (1)			2,947		3,000
	$3.0 million, 8% shareholder note due 2016 (1)			2,931		2,963
	Debt, Total			10,317		9,807
	Less current portion			-2,841		-2,258
	Long-term debt, net of current portion		$	7,476	$	7,549
	(1) Debt discounts relate to warrants issued with shareholder notes and amendments. The aggregate amount of
	unamortized debt discount was $0.2 and $0.1 million at December 31, 2014 and 2013, respectively. For additional
	information, refer to the respective discussions below.
	Line of Credit with FGI
	On February 14, 2011, the Company and certain of its subsidiaries (the “Credit Subsidiaries”) entered into Sale and Security Agreements with FGI to provide for a $7.5 million secured demand facility backed by its receivables and inventory. The Company and the Credit Subsidiaries also entered into guarantees to guarantee the performance of their obligations under the Sale and Security Agreements. The Company also granted FGI a first lien collateral interest in substantially all of its assets. On August 15, 2012, the Company and FGI agreed to amend the FGI facility. As amended, the initial term was extended from February 14, 2013 to August 15, 2015 and may be extended at the Company’s option for additional one-year terms. However, FGI can cancel the facility at any time.
	In connection with the sale of the Reno Business, the Company’s Reno, Nevada subsidiary and FGI entered into an agreement, dated October 15, 2014 (the “Termination Agreement”), to terminate the Sale of Accounts and Security Agreement, dated February 14, 2011, among the Company subsidiary and FGI, as amended (the “Reno-FGI Financing Agreement”). Pursuant to the Termination Agreement, the Company was required to make a final payment of $0.4 million and FGI agreed to release all encumbrances on the Reno Business’ personal property under the Reno-FGI Financing Agreement.
	Under the FGI facility, FGI can elect to purchase eligible accounts receivables from the Company and the Credit Subsidiaries at up to 80% of the value of such receivables (retaining a 20% reserve). Purchased receivables are subject to full recourse to the Company in the event of nonpayment by the customer. FGI becomes responsible for the servicing and administration of the accounts receivable purchased. The Company is not obligated to offer accounts in any month and FGI has the right to decline to purchase any accounts. At FGI’s election, FGI may advance the Company up to 80% of the value of any purchased accounts receivable, subject to the $7.5 million limit. Reserves retained by FGI on any purchased receivable are expected to be refunded to the Company net of interest and fees on advances once the receivables are collected from customers. The Company may also borrow against eligible inventory up to the inventory sublimit, as determined by FGI, subject to the aggregate $7.5 million limit under the FGI facility and certain other conditions. At December 31, 2014, the inventory sublimit amount was the lesser of $1.5 million or 50% of the aggregate purchase price paid for accounts receivable purchased under the FGI facility. While the overall credit limit and the inventory sublimit were not changed, borrowing against the Company’s significant OEM customer’s inventory has been limited to $0.2 million by FGI due to their concerns about customer concentration as of December 31, 2014.
	The interest rate on advances or borrowings under the FGI facility is the greater of (i) 6.50% per annum and (ii) 2.50% per annum above the prime rate, as defined in the FGI facility and was 6.50% at December 31, 2014 and 2013. Any advances or borrowings under the FGI facility are due on demand. The Company also agreed to pay FGI collateral management fees of 0.30% per month on the face amount of eligible receivables as to which advances have been made and 0.38% per month on borrowings against inventory, if any. At any time outstanding advances or borrowings under the FGI facility are less than $2.4 million, the Company agreed to pay FGI standby fees of (i) the interest rate on the difference between $2.4 million and the average outstanding amounts and (ii) 0.44% per month on 80% of the amount by which advances or borrowings are less than the agreed $2.4 million minimum.
	The Company paid FGI a one-time facility fee of $75,000 upon entry into the FGI facility and $75,000 upon amending the FGI facility. If the Company terminates the FGI facility prior to the last day of the initial term, as extended, or any additional term, it must pay a termination fee of 2% of the facility limit then in effect. No termination fee will be due if the Company notifies FGI of its intent to terminate within 10 days of FGI increasing the reserve percentage for accounts to greater than 40% for more than 30 consecutive days. FGI may terminate the facility at any time. The termination fee is not payable upon a termination by FGI or upon non-renewal.
	At December 31, 2014, the Company had $2.2 million of gross accounts receivable pledged to FGI as collateral for short-term debt in the amount of $1.6 million. At December 31, 2014, the Company also had $1.2 million in borrowings outstanding against eligible inventory. The Company was in compliance with the terms of the FGI facility at December 31, 2014. However, there is no guarantee that the Company will be able to borrow to the full limit of $7.5 million if FGI chooses not to finance a portion of its receivables or inventory.
	$1.5 Million, 8% Shareholder Note Due 2016
	On December 30, 2010, the Company executed a Loan Commitment Letter with Kanis S.A., a shareholder of the Company, pursuant to which Kanis S.A. loaned the Company $1.5 million. The loan is unsecured and bears interest on the unpaid principal at a rate of 6%, with interest only payable quarterly in arrears, commencing March 31, 2011. In addition to principal and accrued interest, the Company was obligated to pay Kanis S.A. at maturity a “Payment Premium” ranging from $100,000 to $200,000 based proportionally on the number of days that the loan remains outstanding. There is no prepayment penalty. The loan originally matured on June 30, 2013. On January 30, 2013, the Company and Kanis S.A. agreed to amend certain terms of the loan to change the maturity date from June 30, 2013 to June 30, 2015 and to increase the interest rate from 6% to 8% beginning on June 30, 2013. In addition, the payment premium due under this note was changed to a fixed amount of $250,000 with $100,000 payable on June 30, 2013 and the remaining amount payable at maturity on June 30, 2015. On November 11, 2014, the Company entered into a letter agreement with Kanis S.A., whereby Kanis S.A. agreed to amend the terms of this loan, such that the maturity date and payment premium due on June 30, 2015 were extended to October 1, 2016.
	On June 28, 2013, the Company and Kanis S.A. entered into a letter agreement pursuant to which Kanis S.A. agreed that the $100,000 payment premium due June 30, 2013 and $135,000 in accrued interest on the shareholder notes payable to Kanis S.A. as of June 30, 2013 could be paid, at the option of the Company, in cash or by issuance of equity securities of the Company. On July 3, 2013, concurrent with the closing of its public offering, the Company issued to Kanis S.A. 188,000 shares of common stock and warrants to purchase up to 94,000 shares of common stock at $1.25 per share, in satisfaction of the payment premium and accrued interest, as described above.
	In connection with the original loan, the Company issued Kanis S.A. warrants to acquire 25,000 shares of its common stock at $10.40 per share. In connection with a letter agreement, dated November 11, 2014, the Company issued Kanis S.A. warrants to acquire 80,000 shares of its common stock at $1.75 per share. For additional information regarding this recent issuance of warrants, refer to Note 10, “Stockholders’ Equity”. The relative estimated fair value of these warrant issuances represent a discount from the face amount of the loan which has been recorded as of the respective issuance dates. The discount is being amortized using the effective interest method over the remaining term of the loan.
	$3.0 Million, 8% Subordinated Convertible Shareholder Notes Due 2016
	On April 11, 2011, the Company entered into a Subordinated Convertible Notes Commitment Letter with Kanis S.A. that provides for the sale and issuance by the Company of 8% subordinated convertible notes (the “Convertible Notes”). As provided in this commitment letter, on May 6, 2011 Kanis S.A. purchased from the Company at par $3.0 million aggregate principal amount of the Convertible Notes, which bear interest at a rate of 8% per annum, payable quarterly in arrears.
	The Convertible Notes have a stated maturity of five years from the date of issuance. The original agreement allowed for the acceleration of the maturity of the Convertible Notes if: (i) the Company was in breach of the Convertible Notes or other agreements with Kanis S.A., or (ii) Kanis S.A. provided written notice, not less than 30 days prior to such date, that it elected to accelerate the maturity to a date not earlier than November 11, 2012. On February 16, 2012, the Company and Kanis S.A. agreed to amend the terms of the Convertible Notes to modify the early redemption date from November 11, 2012 to May 12, 2013. On January 30, 2013, the Company and Kanis S.A. entered into a letter agreement regarding the Convertible Notes whereby Kanis S.A. agreed not to accelerate the maturity of these notes during the 2013 calendar year and on March 21, 2014, the Company and Kanis S.A. entered into another letter agreement whereby Kanis S.A. agreed not to accelerate the maturity of these notes prior to July 1, 2015. On November 11, 2014, the Company entered into a letter agreement with Kanis S.A., whereby Kanis S.A. agreed to amend the terms of this loan, such that the maturity date was extended to October 1, 2016 and the early redemption feature was removed.
	The Convertible Notes also provide that the Company has the option to redeem the Convertible Notes at any time at a price equal to 100% of the face amount plus accrued and unpaid interest through the date of redemption.
	There is no prepayment penalty. The Convertible Notes are unsecured obligations of the Company and subordinated to existing and future secured indebtedness of the Company.
	The outstanding principal balance of the Convertible Notes plus accrued and unpaid interest were convertible into shares of the Company’s common stock at an initial conversion price equal to $7.044 per share, which was 120% of the closing bid price per share of the Company’s common stock on April 8, 2011, into no more than 369,853 shares. The Company evaluated the Convertible Notes and determined that there were no embedded derivatives contained in the Convertible Notes that require separate accounting. Additionally, there was no beneficial conversion feature associated with the Convertible Notes since the conversion price was not lower than the estimated fair market value of the Company’s common stock on the issuance date. As such, the entire proceeds from the Convertible Notes are recorded as debt in the consolidated balance sheets.
	On July 27, 2012, the Company and Kanis S.A. further amended the terms of the Convertible Notes to modify the conversion feature. As amended, the outstanding principal balance of the Convertible Notes, and accrued and unpaid interest are convertible, at the option of Kanis S.A., at any time upon written notice given not less than 75 calendar days prior to the date of conversion, into no more than 250,000 shares of the Company’s common stock at a conversion price of $4.00 per share. The Company evaluated the modification and determined that the modification was not substantial and did not qualify as a debt extinguishment. Accordingly, no gain or loss was recognized from the modification.
	In connection with the February 16, 2012 amendment, the Company issued to Kanis S.A. warrants to acquire 5,000 shares of its common stock at $3.80 per share. The warrants are exercisable on or after August 16, 2014 and expire on the earlier of (i) August 16, 2017 or (ii) that date that is 30 days after the Company gives notice to the warrant holder that the market value of one share of its common stock has exceeded 130% of the exercise price of the warrant for 10 consecutive days on or after August 16, 2014. The Company did not receive any cash consideration for the issuance of the warrants. The Company relied on the private placement exemption provided by Regulation S.
	In connection with a letter agreement, dated November 11, 2014, the Company issued Kanis S.A. warrants to acquire 80,000 shares of its common stock at $1.75 per share. For additional information regarding this recent issuance of warrants, refer to Note 10, “Stockholders’ Equity”. The relative estimated fair value of this warrant issuance represents a discount from the face amount of the loan and has been recorded as a discount from the loan amount as of the issuance date. The discount is being amortized using the effective interest method over the remaining term of the loan.
	$3.0 Million, 8% Shareholder Note Due 2016
	On July 27, 2012, the Company executed a Loan Commitment Letter with Kanis S.A., pursuant to which the Company issued a promissory note in the principal amount of $3.0 million, which bears interest at 8% per annum, payable quarterly in arrears. The promissory note matures on July 27, 2015. There is no prepayment penalty or premium, and the promissory note is unsecured. On November 11, 2014, the Company entered into a letter agreement with Kanis S.A., whereby Kanis S.A. agreed to amend the terms of this loan, such that the maturity date was extended to October 1, 2016.
	In connection with the promissory note, the Company issued Kanis S.A. a warrant to acquire 45,000 shares of its common stock at $2.09 per share, a third of which becomes exercisable on the issuance date and each of the first and second anniversaries of the issuance date. This warrant expires on July 27, 2018. The Company did not receive any cash consideration for the issuance of this warrant, which was issued in reliance upon the private placement exemption provided by Regulation S. In connection with a letter agreement, dated November 11, 2014, the Company issued Kanis S.A. warrants to acquire 80,000 shares of its common stock at $1.75 per share. For additional information regarding this recent issuance of warrants, refer to Note 10, “Stockholders’ Equity”. The relative estimated fair values of these warrant issuances represent a discount from the face amount of the loan which has been recorded as of the respective issuance dates. The discount is being amortized using the effective interest method over the remaining term of the loan.
	Annual scheduled principal payments of debt based on earliest redemption date as of December 31, 2014 are (in thousands):
	Years ending December 31:
	2015	$	2,841
	2016		7,650
	Total	$	10,491

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	10.    Stockholders’ Equity
	Shelf Registration
	On May 15, 2012, the Company filed a Shelf Registration which was declared effective by the SEC on May 21, 2012. The Shelf Registration permits the Company to sell, from time to time, up to an aggregate of $50.0 million of various securities, including common stock, preferred stock, warrants to purchase common stock or preferred stock and units consisting of one or more shares of common stock, shares of preferred stock, warrants, or any combination of such securities. However, the Company may not sell its securities in a primary offering pursuant to the Shelf Registration or any other registration statement on Form S-3 with a value exceeding one-third of its public float in any 12-month period (unless the Company’s public float rises to $75.0 million or more). The Shelf Registration is intended to provide the Company with additional flexibility to access capital markets for general corporate purposes, subject to market conditions and the Company's capital needs.
	July 2013 Offering
	On June 28, 2013, the Company entered into an underwriting agreement (the “Underwriting Agreement”) with Roth Capital Partners, LLC, (the “Underwriter”) related to the public offering of an aggregate 1,600,000 shares of the Company’s common stock together with warrants to purchase up to 800,000 shares of common stock. The Underwriters were also granted a 30 day option to purchase up to an additional 240,000 shares of common stock and/or warrants to purchase up to an additional 120,000 shares of common stock to cover overallotments, if any. This offering was made pursuant to the Company’s Shelf Registration. On July 3, 2013, the Company closed the offering (the “July Offering”) in which it sold 1,730,000 shares of common stock at a price of $1.245 per share and warrants to purchase up to 865,000 shares at a price per warrant of $0.01, including 130,000 shares and 65,000 warrants upon partial exercise of the Underwriter’s over-allotment option. The securities were sold in units consisting of one share of common stock and 0.5 of one warrant to purchase one share of common stock for a price of $1.25 per unit.
	The Company received gross proceeds of $2.2 million and net proceeds of $1.7 million after deducting discounts and commissions to the Underwriter and offering expenses. The July Offering warrants are within the scope of ASC 815-40 and are required to be recorded as liabilities. Accordingly, of the $1.7 million in net proceeds, $1.0 million was allocated to the common stock and included in additional paid-in capital and $0.7 million was allocated to the warrant liability based on the fair value of the warrants on the issuance date. Additionally, $0.1 million of the underwriting discounts and commissions and offering costs were allocated to the warrants, based on the relative fair value of the July Offering warrants and the common stock on the issuance date, and was included in other expense, net in the accompanying statement of comprehensive loss for the year ended December 31, 2013. The Company used the net proceeds for general corporate purposes, including working capital, general and administrative expenses, capital expenditures and implementation of its strategic priorities, and to repay a portion of amounts outstanding under its line of credit.
	In accordance with the Underwriting Agreement, the Company issued the Underwriter a warrants to purchase in aggregate 34,600 shares of the Company’s common stock with an exercise price of $1.25 per share. The warrants are exercisable beginning on December 25, 2013 through June 28, 2018. The fair value of these warrants, approximated zero.
	April 2014 Offering
	On April 1, 2014, the Company entered into subscription agreements with certain investors who agreed to purchase an aggregate of 2,030,000 shares of the Company’s common stock together with warrants to purchase up to 812,000 shares of common stock (the “April Offering”). This offering was made pursuant to the Company’s Shelf Registration, and closed on April 4, 2014. The securities were sold in units consisting of one share of common stock and 0.4 of a warrant to purchase one share of common stock for a price of $3.40 per unit.
	The Company received gross proceeds of $6.9 million and net proceeds of $6.1 million after deducting placement agent fees and other offering expenses. The April Offering warrants are within the scope of ASC 815-40 and are required to be recorded as liabilities. Accordingly, of the $6.1 million in net proceeds, $4.6 million was allocated to the common stock and included in additional paid-in capital and $1.5 million was allocated to the warrant liability based on the fair value of the warrants on the issuance date. Additionally, $0.2 million of the placement agent fees and other offering costs were allocated to the warrants, based on the relative fair value of the April Offering warrants and the common stock on the issuance date, and was included in other expense, net in the accompanying statement of comprehensive loss for the year ended December 31, 2014. The Company used the net proceeds for general corporate purposes, including working capital, general and administrative expenses, capital expenditures and implementation of its strategic priorities, and to repay a portion of amounts outstanding under its line of credit.
	November 2014 Offering
	On November 4, 2014, the Company entered into subscription agreements with certain investors who agreed to purchase an aggregate of 1,385,000 shares of the Company’s common stock, Series A Warrants to purchase up to an aggregate of 388,393 shares of common stock with an exercise price of $3.25 per share, for a combined purchase price of $2.80 per share and 0.28 of one Series A Warrant, and Series B Warrants to purchase up to an aggregate of 168,571 shares of common stock with an exercise price of $0.01 per share for a purchase price of $2.79 per Series B Warrant, pursuant to the Shelf Registration (the “November Offering”).
	The Company received gross proceeds of $4.4 million and net proceeds of $3.8 million after deducting placement agent fees and other offering expenses. The November Offering warrants are within the scope of ASC 815-40 and are required to be recorded as liabilities. Accordingly, of the $3.8 million in net proceeds, $2.5 million was allocated to the common stock and included in additional paid-in capital and $1.3 million was allocated to the warrant liability based on the fair value of the warrants on the issuance date. Additionally, $0.1 million of the placement agent fees and other offering costs were allocated to the warrants, based on the relative fair value of the November Offering warrants and the common stock on the issuance date, and was included in other expense, net in the accompanying statement of comprehensive loss for the year ended December 31, 2014. The Company intends to use the net proceeds for general corporate purposes, which may include working capital, general and administrative expenses, capital expenditures and implementation of its strategic priorities. The Company may also use a portion of the net proceeds to acquire or invest in businesses, products and technologies that are complementary to its current business, although there are no present commitments or agreements for any such transactions.
	Other Issuances of Common Stock and Warrants
	On June 28, 2013, the Company and one of its directors entered into an agreement pursuant to which the director agreed to purchase $0.1 million of the Company’s common stock in a private placement at a price of $1.84 per share, the closing bid price on the day preceding the date of the agreement. In July 2013, the Company issued 54,347 shares of common stock to the director under this agreement.
	Concurrent with its public offering of common stock, on July 3, 2013, the Company paid $235,000 of premium and interest due June 30, 2013, pursuant to loans made to the Company by Kanis S.A., with 188,000 shares of common stock and warrants to purchase 94,000 shares of common stock. The warrants have an exercise price of $1.25 per share, and are exercisable immediately for a period of five years. The Company relied on the private placement exemption provided by Regulation S.
	In connection with a letter agreement, dated November 11, 2014, the Company issued Kanis S.A. warrants to acquire 80,000 shares of its common stock at $1.75 per share for a five year period. The Company did not receive any cash consideration for the issuance of this warrant, which was issued in reliance upon the private placement exemption provided by Regulation S. For additional information, refer to Note 9, “Debt”.
	For additional information on the warrant issuances discussed within this Note, refer to Note 11, “Warrants”.
	Common Stock Purchase Agreement with Lincoln Park Capital (“LPC”)
	On October 7, 2011, the Company signed a purchase agreement with LPC, together with a registration rights agreement, whereby LPC agreed to purchase up to $10.0 million of the Company’s common stock over a 30-month period ending April 24, 2014. These agreements expired unused.

Warrants

Warrants	12 Months Ended
	Dec. 31, 2014
Warrants Disclosures [Abstract]
Warrants Disclosures [Text Block]	11.    Warrants
	From time to time, the Company issues warrants to purchase its common stock. Warrants have been issued for consulting services, in connection with the Company’s issuance of debt and sales of its common stock. For additional information regarding the warrants discussed in this Note, refer to Note 10, “Stockholders’ Equity”.
	Warrant activity is summarized as follows:
				Weighted
				Average
				Exercise			Range of
		Shares		Price			Exercise Prices
	Outstanding at December 31, 2012	923,090		$	7.77		$2.09 - $48.90
	Issued	993,600		$	1.25		$1.25
	Cancelled (1)	-128,333		$	7.92		$7.92
	Expired	-648,822		$	8.4		$7.92 - $48.90
	Outstanding at December 31, 2013	1,139,535		$	1.68		$1.25 - $10.40
	Issued	1,448,964		$	3.32		$0.01 - $4.20
	Exercised	-968,571		$	1.03		$0.01 - $1.25
	Expired	-9,859		$	2.8		$2.80
	Outstanding and exercisable at December 31, 2014	1,610,069		$	3.54		$1.25 - $10.40
	(1) On September 30, 2013, the Company and Kanis S.A. agreed to cancel these warrants, originally issued on December 22, 2010 and scheduled to expire on December 22, 2013.
	Warrant Classification
	The Company evaluated the following warrants on issuance and at each reporting date to determine proper classification as equity or as a liability.
	Issuance
	Date	Quantity	Key Considerations	Classification
	July	959,000	• Require settlement in registered shares	Liability
	2013	-1	• Include full-ratchet down-round price protection
	July	34,600	• Require physical settlement or net-share settlement	Equity
	2013		• Settlement permitted in unregistered shares
	April	812,000	• Require settlement in registered shares	Liability
	2014		• Cash payment provision for failure to timely deliver
	November	556,964	• Require settlement in registered shares	Liability
	2014	-2	• Cash payment provision for failure to timely deliver
	November	80,000	• Require settlement in registered shares	Liability
	2014		• Include full-ratchet down-round price protection
	(1) Includes warrants to purchase 94,000 shares of Company common stock issued concurrently with the public offering in a private placement.
	(2) Includes 388,393 Series A Warrants and 168,571 Series B Warrants.
	Warrant Liability
	The Company’s warrant liability is carried at fair value and is classified as Level 3 in the fair value hierarchy because the warrants are valued based on unobservable inputs.
	The Company determines the fair value of its warrant liability using the Black-Scholes option-pricing model unless the awards are subject to market conditions, in which case it uses a Monte Carlo simulation model, which utilizes multiple input variables to estimate the probability that market conditions will be achieved. These models are dependent on several variables such as the instrument’s expected term, expected strike price, expected risk-free interest rate over the expected term of the instrument, expected dividend yield rate over the expected term and the expected volatility. The expected strike price for warrants with full-ratchet down-round price protection is based on a weighted average probability analysis of the strike price changes expected during the term as a result of the full-ratchet down-round price protection.
	Due to the significant change in the Company following its business combination with Catalytic Solutions, Inc. (the “Merger”), CDTi’s pre-Merger historical price volatility was initially not considered representative of expected volatility going forward. Therefore, for warrants with an expected term that required a volatility look-back that pre-dates the Merger, the Company used an estimate based upon a weighted average of implied and historical volatility of a portfolio of peer companies and CDTi’s post-Merger historical volatility for the valuation of these warrants. For warrants with an expected term that does not require a volatility look-back that pre-dates the Merger, CDTi’s post-Merger historical price volatility was considered representative of expected volatility going forward, and accordingly, only CDTi’s historical volatility was used for the valuation of these warrants. The expected life is equal to the remaining contractual life of the warrants.
	The assumptions used in the Black-Scholes option-pricing model to estimate the fair value of the warrant liability for the following warrants, as of their respective issuance dates, are as follows:
					Issued
		December 31,			April 4,
		2014			2014
	Number of warrants		812,000			812,000
	CDTi stock price	$	1.81		$	2.95
	Strike price	$	4.2		$	4.2
	Expected volatility		86.60%			84.90%
	Risk-free interest rate		1.60%			1.90%
	Dividend yield		─			─
	Expected life in years		4.8			5.5
		December 31,			Issued November 4, 2014
		2014			Series A			Series B
	Number of warrants		388,393			388,393			168,571
	CDTi stock price	$	1.81		$	3.04		$	3.04
	Strike price	$	3.25		$	3.25		$	0.01
	Expected volatility		86.50%			87.10%			149.00%
	Risk-free interest rate		1.60%			1.60%			0.10%
	Dividend yield		─			─			─
	Expected life in years		4.9			5			0.5
	The assumptions used in the Monte Carlo simulation model to estimate the fair value of the warrant liability for the following warrants, as of their respective issuance dates, are as follows:
									Issued
			December 31,						July 3,
			2014			2013			2013
	Number of warrants			159,000			959,000			959,000
	CDTi stock price		$	1.81		$	1.51		$	1.15
	Strike price		$	1.25		$	1.25		$	1.25
Expected volatility (1)			103.60%			73.60%			80.50%
Risk-free interest rate			1.20%			1.80%			1.60%
Dividend yield			─			─			─
Expected life in years			3.5			4.5			5
(1) During 2014, the Company's post-Merger historical volatility began to be considered representive of expected volatility going forward for these warrants.
				Issued
	December 31,			November 11,
	2014			2014
Number of warrants		80,000			80,000
CDTi stock price	$	1.81		$	2.46
Strike price	$	1.75		$	1.75
Expected volatility		77.00%			76.60%
Risk-free interest rate		1.60%			1.70%
Dividend yield		─			─
Expected life in years		4.9			5
The warrant liability, included in accrued expenses and other current liabilities in the accompanying consolidated balance sheets, is re-measured at the end of each reporting period with changes in fair value recognized in other income (expense) in the consolidated statements of comprehensive loss. Upon the exercise of a warrant that is classified as a liability, the fair value of the warrant exercised is re-measured on the exercise date and reclassified from warrant liability to additional paid-in capital.

StockBased_Compensation

Stock-Based Compensation	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]	12.    Stock-Based Compensation
	The Clean Diesel Technologies, Inc. Stock Incentive Plan (formerly known as the Clean Diesel Technologies, Inc. 1994 Incentive Plan), as amended (the “Plan”), provides for the awarding of incentive stock options, non-qualified stock options, stock appreciation rights, restricted shares, performance awards, bonuses or other forms of share-based awards, or combinations of these to the Company’s directors, officers, employees, consultants and advisors (except consultants or advisors in capital-raising transactions) as determined by the board of directors. At the Company’s Annual Meeting of Shareholders held on May 23, 2012, the Company’s shareholders approved certain amendments to the Plan, the most significant of which changed the Plan name, removed the evergreen provision and established a maximum number of 1.4 million shares to be reserved for issuance under the Plan, disallowed the repricing of outstanding stock options without shareholder approval, removed the ability to issue cash bonus awards under the Plan and modified the change in control provisions within the Plan. As of December 31, 2014, there were 149,708 shares available for future grants under the Plan.
	Total stock-based compensation expense was $0.6 million and $0.7 million for the years ended December 31, 2014 and 2013, respectively.
	Stock Options
	Stock option activity is summarized as follows:
			Weighted Average		Weighted	Aggregate
			Exercise Price		Average	Intrinsic Value
					Remaining	(thousands)
					Contractual Term
		Options			(in years)
	Outstanding at December 31, 2013	714,712	$	7.17
	Exercised	-178,871	$	2.94
	Cancelled	-87,918	$	2.85
	Outstanding at December 31, 2014	447,923	$	8.74	6.1	$	-
	Exercisable at December 31, 2014	396,291	$	9.5	6	$	-
	The aggregate intrinsic value represents the difference between the exercise price and the Company’s closing stock price on the last trading day of the year.
	Stock options granted under the Plan typically expire ten years from the date of grant and are issued at a price equal to the fair market value of the underlying stock on the date of grant. The Company’s board of directors may establish such vesting and other conditions with respect to options as it deems appropriate.
	Compensation costs for stock options that vest over time are recognized over the vesting period on a straight-line basis. As of December 31 2014, the remaining unrecognized compensation cost related to stock option grants was insignificant.
	Restricted Stock Units
	RSU activity is as follows:
		Shares	Weighted
			Average
			Grant Date
			Fair Value
	Nonvested at December 31, 2013 (1)	285,558	$	2.35
	Granted	414,103	$	2.8
	Vested	-196,849	$	2.44
	Forfeited	-150,046	$	2.27
	Nonvested units at December 31, 2014	352,766	$	2.87
	(1) Excludes 26,638 RSUs vested and unissued
	As of December 31, 2014, the Company had approximately $0.8 million of unrecognized compensation expense related to RSUs, which will be recognized over a weighted average estimated remaining life of 1.9 years. The RSUs vested and unissued noted in the table above represent awards granted to employees who are subject to the terms of the Company’s black out policy from time to time due to their knowledge of non-public information and who were unable to sell shares on the open market to cover their tax obligations for their vested RSUs by the dates noted above.

Other_Expense_Net

Other Expense, Net	12 Months Ended
	Dec. 31, 2014
Other Income and Expenses [Abstract]
Other Income and Other Expense Disclosure [Text Block]	13.    Other Expense, Net
	Other expense, net, consists of the following (in thousands):
		Years Ended
		December 31,
		2014		2013
	Loss on change in fair value of liability-classified warrants	$	-506	$	-180
	Offering costs allocated to warrants issued		-293		-123
	Income (loss) from unconsolidated affiliates		46		-561
	Foreign currency exchange gain		549		56
	Other		30		52
	Other expense, net	$	-174	$	-756

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	14.    Income Taxes
	Income (loss) from continuing operations before income taxes include the following components (in thousands):
		Years Ended
		December 31,
		2014		2013
	U.S.-based operations	$	-9,979	$	-8,556
	Non U.S.-based operations		1,004		2,053
	(Loss) income from continuing operations before income taxes	$	-8,975	$	-6,503
	Income tax expense (benefit) attributable to loss from continuing operations is summarized as follows (in thousands):
		Current		Deferred		Total
	Year ended December 31, 2014:
	U.S. Federal	$	4	$	-	$	4
	State and local		17		-		17
	Foreign		444		-327		117
	Total	$	465	$	-327	$	138
		Current		Deferred		Total
	Year ended December 31, 2013:
	U.S. Federal	$	-	$	-	$	-
	State and local		4		-		4
	Foreign		405		-69		336
	Total	$	409	$	-69	$	340
	Income taxes attributable to loss from continuing operations differ from the amounts computed by applying the U.S. federal statutory rate of 34% to loss from continuing operations before income taxes as shown below (in thousands):
		Years Ended
		December 31,
		2014		2013
	Expected tax benefit	$	-3,052	$	-2,211
	Net tax effects of:
	Foreign tax rate differential		-214		-515
	State taxes, net of federal benefit		-381		-48
	Return to provision adjustment		-579		-270
	Research and other credits		-92		-139
	Permanent difference on Convertible Notes and warrants		277		61
	Expiring net operating loss carryforwards		2,441		-
	Permanent difference on deemed dividend		-		1,040
	Other		175		35
	Change in deferred tax asset valuation allowance		1,563		2,387
	Income tax expense (benefit) from continuing operations	$	138	$	340
	Deferred tax assets and liabilities consist of the following (in thousands):
		December 31,
		2014		2013
	Deferred tax assets:
	Research and development credits	$	2,054	$	1,824
	Other credits		378		378
	Operating loss carry forwards		13,974		12,592
	Inventories		282		338
	Allowance for doubtful accounts		321		118
	Depreciation		400		349
	Deferred research and development expenses for income tax		327		327
	Non-cash compensation		1,176		957
	Other		410		794
	Total gross deferred tax assets		19,322		17,677
	Valuation allowance		-18,856		-17,293
	Net deferred tax assets		466		384
	Deferred tax liabilities
	Other identifiable intangible assets		-825		-1,070
	Total gross deferred tax liabilities		-825		-1,070
	Net deferred tax liabilities	$	-359	$	-686
	The Company had approximately $34.4 million, $20.4 million and $4.6 million of federal, state and foreign income tax net operating loss carryforwards at December 31, 2014, respectively. The foreign net operating losses can be carried forward indefinitely. Future utilization of the federal and state net operating losses and credit carryforwards is subject to a substantial annual limitation due to ownership change limitations as required by Sections 382 and 383 of the Internal Revenue Code of 1986, as amended (the “Code”), as well as similar state limitations.
	The Company performed a study to evaluate the status of net operating loss carryforwards as a result of the ownership change from the Merger. The results of the study provided that the merger caused an “ownership change” of the Company as defined for U.S. federal income tax purposes as of the date of the merger. The “ownership change” will significantly limit the use of the Company’s net operating losses and credits in future tax years. Of the $34.4 million federal loss carryforwards approximately $5.4 million of the loss will be subject to an annual limitation of $0.4 million within the next 5 years and $0.2 million for the following 15 years. The federal net operating loss carryforwards will expire in fiscal year 2034. As a result of the “ownership change” the federal research and development credits have been limited and based on the limitation the Company does not anticipate being able to use any of these credits that existed as of the date of the Merger in future tax years. However, the Company has approximately $0.3 million in research and development credits post-Merger which is not subject to any limitation. Of the $20.4 million of state net operating loss carryforwards approximately $1.1 million of the loss will be subject to an annual limitation of $0.1 for the next 20 years. The state net operating loss carryforwards will expire in fiscal year 2034. The Company has state research and development credits of $2.7 million. Since the state credits have an indefinite life, the Company did not write them off even though it is also limited under Section 383. The Company has a full valuation allowance against the related deferred tax assets as it is more likely than not that they will not be realized by the Company.
	In assessing the potential realization of deferred tax assets, consideration is given to whether it is more likely than not that some portion or all of the deferred tax assets will be realized. The ultimate realization of deferred tax assets is dependent upon the Company attaining future taxable income during the periods in which those temporary differences become deductible. In addition, the utilization of net operating loss carryforwards may be limited due to restrictions imposed under applicable federal and state tax laws due to a change in ownership. Based upon the level of historical operating losses and future projections, management believes it is more likely than not that the Company will not realize the deferred tax assets.
	The Company has not recognized a deferred tax liability on undistributed earnings of its foreign subsidiaries, because these earnings are intended to be permanently reinvested. The amount of the unrecognized deferred tax liability depends on judgment required to analyze the withholding tax due, the applicable tax law and factual circumstances in effect at the time of any such distributions. Therefore, the Company believes it is not practicable at this time to reliably determine the amount of unrecognized deferred tax liability related to its undistributed earnings; however, these undistributed earnings are immaterial. If circumstances change and it becomes apparent that some or all of the undistributed earnings of a subsidiary will be remitted and income taxes have not been recognized by the parent entity, the parent entity shall accrue as an expense of the current period income taxes attributable to that remittance.
	The following changes occurred in the amount of unrecognized tax benefits including related interest and penalties (in thousands):
		Years Ended
		December 31,
	2014		2013
Balance at beginning of year	$	543	$	452
Additions for current year tax provisions		140		91
Reduction for prior year tax provisions		-		-
Balance at end of year	$	683	$	543
If recognized, the entire amount of the unrecognized tax benefits would affect the effective tax rate. As of December 31, 2014 and 2013, the Company had $0.2 million accrued for payment of interest and penalties related to unrecognized tax benefits.
The Company operates in multiple tax jurisdictions, both within and outside of the United States. Although the timing of the resolution and/or closure of audits is not certain, the Company does not believe it is reasonably possible that its unrecognized tax benefits would materially change in the next twelve months. The following tax years remain open to examination by the major domestic taxing jurisdictions to which it is subject:
	Open Tax Years
United States – Federal	2011 – 2014
United States – State	2010 – 2014
Canada	2009 – 2014
Sweden	2012 – 2014
United Kingdom	2010 – 2014

Equity_Investments

Equity Investments	12 Months Ended
	Dec. 31, 2014
Investments Schedule [Abstract]
Investment [Text Block]	15.    Equity Investments
	Pirelli Joint Venture
	On February 19, 2013, the Company entered into a joint venture agreement (the “Joint Venture Agreement”) with Pirelli & C. Ambiente SpA (“Pirelli”) to form a joint venture entity, Eco Emission Enterprise Srl under the laws of Italy (the “Joint Venture”), through which the Company and Pirelli would jointly sell their emission control products in Europe and the Commonwealth of Independent States countries. Pursuant to the agreement, both partners agreed to sell products to the Joint Venture which would earn a commission to market and sell these products. As such, all of the Company’s existing business in Sweden and the U.K. would be conducted through the Joint Venture. The Joint Venture commenced operations in April 2013.
	The Joint Venture Agreement provided that the Company and Pirelli each held 50% of the total issued share capital of the Joint Venture. Pursuant to the Joint Venture Agreement, in February 2013, the Company and Pirelli each contributed €50,000 (approximately $66,000) to the Joint Venture as initial capital contributions. In addition, in accordance with the Joint Venture Agreement, the Company and Pirelli provided shareholder loans of €200,000 (approximately $261,000) each in April 2013. During 2013, these loans were converted into equity contributions as required by local statutory regulations. In the fourth quarter of 2013, the Company and Pirelli each contributed an additional €262,000 (approximately $361,000) to the Joint Venture.
	The Company accounts for its investment in the Joint Venture using the equity method. During the year ended December 31, 2013, the Joint Venture incurred a loss of €0.9 million (approximately $1.2 million), and accordingly, the Company recorded a loss of $0.6 million in other expense.
	On November 8, 2013, as a result of slower than anticipated progress in achieving sales objectives initially established for the Joint Venture, the Company and Pirelli agreed to voluntarily dissolve the Joint Venture in accordance with the Joint Venture Agreement. The Joint Venture ceased operations on November 30, 2013 and commenced liquidation on December 9, 2013. The dissolution was finalized in April 2014. The majority of the Company’s investment balance of $0.1 million, included in other assets in the accompanying consolidated balance sheet December 31, 2013, was received in April 2014, with a small balance to be collected following the receipt of value added tax due from the Swedish and Italian governments. The Company has resumed its operations in Europe in a similar manner as conducted prior to the Joint Venture.
	TCC Investment
	In February 2008, the Company entered into an agreement with Tanaka Holdings Co., Ltd. (formerly Tanaka Holdings K.K.), a Japanese company, which, together with its subsidiary Tanaka Kikinzoku Kogyo K.K., is referred to herein as TKK, to form a new joint venture company, TC Catalyst, Inc. (“TCC”), a Japanese corporation. The joint venture is part of the Catalyst division. The Company entered the joint venture in order to improve its presence in Japan and Asia and strengthen its business flow into the Asian market. Initially, the Company and TKK each owned 50% of TCC.
	In December 2008, the Company sold shares in TCC to TKK reducing its ownership to 30% and also sold to TKK certain intellectual property and associated rights in various countries in Asia (the “Territory”) related to heavy duty catalysts used in commercial vehicles and applications. In December 2009, the Company sold to TKK certain intellectual property and associated rights in the Territory related to three-way catalysts, including low-platinum group metal (“PGM”) catalysts, for non-commercial light vehicles and zero-PGM three-way catalysts for heavy duty commercial vehicles and applications and non-commercial light vehicles. As part of the transaction, the Company also sold shares in TCC, which reduced its ownership in the joint venture to 5%. The Company remains contractually obligated to fund its portion of the losses of the joint venture based on its ownership percentage, and it has also agreed not to compete in the Territory with TKK or TCC in connection with heavy duty commercial vehicles and applications and light duty vehicles.
	Subsequent to these arrangements, the Company discovered that an exception allowing it to continue to supply catalysts in Japan to its largest customer had been omitted in an amendment to the original transaction documents with TKK. The Company has shipped approximately $5.6 million of catalysts covered by the agreements since such amendment through December 31, 2014. In this regard, the Company has made a good faith payment of $0.3 million to TKK with respect to such prior shipments. For additional information regarding recent developments with TKK and TCC, refer to Note 19, “Subsequent Event”.
	The Company’s investment in TCC is accounted for using the equity method as the Company still has significant influence over TCC as a result of having a seat on TCC’s board and due to the technological interdependence between TCC and the Company. The Company’s share of income and losses of TCC for the periods presented in this report are not significant.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	16.    Commitments and Contingencies
	Lease Commitments
	The Company leases certain equipment and facilities under operating leases that expire through 2020. The Company recognizes its minimum lease payments, including escalation clauses, on a straight-line basis over the minimum lease term of the lease. Rent expense was $1.0 million during the years ended December 31, 2014 and 2013.
	Future minimum lease payments under non-cancelable operating leases (with initial or remaining lease terms in excess of one year) as of December 31, 2014 are (in thousands):
	Years ending December 31:
	2015	$	640
	2016		571
	2017		408
	2018		353
	2019 and thereafter		3
	Total minimum lease payments	$	1,975
	Legal Proceeding
	On April 30, 2010, the Company received notice of an administrative complaint filed by a past chief financial officer. The complaint was filed with the Hartford, Connecticut office of the U.S. Department of Labor (“U.S. DOL”) under Section 806 of the Sarbanes-Oxley Act of 2002 (“SOX”) and alleged, among other things, that the Company’s termination of her employment on April 19, 2010 was retaliatory and due to her alleged protected activity associated with comments she made to the Company’s Board of Directors at their meeting on March 26, 2010. On June 14, 2010, the Company filed its response to the complaint denying the allegations and requesting a dismissal of the matter. On September 27, 2013, the U.S. DOL issued preliminary findings on the matter concluding there was reasonable cause to support the former employee’s claims and ordering the Company to pay damages in excess of $1.9 million and take certain other actions. On October 22, 2013, the Company filed its Objections and Request for Hearing with the U.S. DOL which triggered the appointment of an Administrative Law Judge (“ALJ”), and the scheduling of a hearing on the merits of the matter. Thereafter, the parties agreed to participate in a U.S. DOL mediation process on February 7, 2014. On March 13, 2014, the parties entered into a settlement agreement which provided for payment of a one-time lump sum amount of $0.4 million to the former employee, along with issuance of 75,000 shares of Company stock. The settlement was formally approved by the ALJ. As a result, there were mutual releases of all claims and a dismissal of the SOX complaint. The Company accrued a liability of $0.6 million at December 31, 2013, which included the lump sum amount, the market value of the common stock and accrued legal expenses incurred. The settlement was paid and stock issued in April 2014, and the Company recorded an additional loss of $0.1 million related to the increase in the fair value of its common stock at the time of issuance.
	Sales and Use Tax Audit
	The Company is undergoing a sales and use tax audit by the State of California (the “State”) on AUS for the period of 2007 through 2009. The audit has identified a project performed by the Company during that time period for which sales tax was not collected and remitted and for which the State asserts that proper documentation of resale may not have been obtained and that the Company owes sales tax of $1.5 million, inclusive of interest. The Company contends and believes that it received sufficient and proper documentation from its customer to support not collecting and remitting sales tax from that customer and is actively disputing the audit report with the State. On August 12, 2013, the Company appeared at an appeals conference with the State Board of Equalization (“BOE”). On July 21, 2014, the Company received a Decision and Recommendation (“D&R”) from the BOE. The D&R’s conclusion was that the basis for the calculation of the aforementioned $1.5 million tax due should be reduced from $12.2 million to $9.0 million with a commensurate reduction in the tax owed to the State. Regardless of this finding, the Company continues to believe that it will prevail in this matter, as it believes that the State did not adequately address the legal arguments related to the Company’s acceptance of the valid resale certificate from its customer. The Company did not agree to these findings, and therefore, it appealed at a higher level at the BOE. Based on a re-audit, the BOE lowered the tax due to $0.8 million, inclusive of interest. However, the Company continues to not agree to these findings based on the aforementioned reasons, and it will continue with the appeals process. Accordingly, no accrual has been recorded for this matter as the Company does not assess a loss as being probable. Should the Company not prevail in this matter, it will pursue reimbursement from the customer for all assessments from the State.
	For information related to commitments and contingencies related to AUS, a former subsidiary of the Company that was sold in 2009, refer to Note 18, “Discontinued Operations”.
	In addition to the foregoing, the Company is involved in legal proceedings from time to time in the ordinary course of its business. Management does not believe that any of these claims and proceedings against it is likely to have, individually or in the aggregate, a material adverse effect on the Company’s consolidated financial condition, results of operations or cash flows. Accordingly, the Company cannot determine the final amount, if any, of its liability beyond the amount accrued in the consolidated financial statements as of December 31, 2014, nor is it possible to estimate what litigation-related costs will be in the future.

Segment_Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	17.    Segment Reporting
	Although the Company is currently evolving from being a niche manufacturer of emissions control solutions for the automotive original equipment manufacturer, retrofit and aftermarket markets to becoming an advanced materials technology provider for these markets, this evolution has not yet affected the Company’s current reportable segments. Currently, the Company has two business division segments based on the products it delivers:
	Heavy Duty Diesel Systems division — The Heavy Duty Diesel Systems division designs and manufactures verified exhaust emissions control solutions. This division offers a full range of products for the verified retrofit and non-retrofit OEM and replacement markets through its distributor/dealer network and direct sales. These products are used to reduce exhaust emissions created by on-road, off-road and stationary diesel and alternative fuel engines including propane and natural gas. The retrofit market in the U.S. is driven in particular by state and municipal environmental regulations and incentive funding for voluntary early compliance. The Heavy Duty Diesel Systems division derives significant revenues from retrofit with a portfolio of solutions verified by the California Air Resources Board and the United States Environmental Protection Agency.
	Catalyst division — The Catalyst division develops and produces catalysts to reduce emissions from gasoline, diesel and natural gas combustion engines that are offered for multiple markets and a wide range of applications. The Catalyst Division developed a family of unique high-performance catalysts, featuring inexpensive base-metals with low or even no platinum group metals, or PGMs, to provide increased catalytic function and value for technology-driven automotive industry customers. The Catalyst division’s technical and manufacturing competence in the light duty vehicle market is aimed at meeting auto makers’ most stringent requirements, and it has supplied over eleven million parts to light duty vehicle customers since 2001. The Catalyst division also provides catalyst formulations for the Company’s Heavy Duty Diesel Systems division. Intersegment revenues are based on market prices.
	Corporate  — Corporate includes cost for personnel, insurance and public company expenses such as legal, audit and taxes that are not allocated down to the operating divisions.
	Summarized financial information for the Company’s reportable segments is as follows (in thousands):
			Years Ended
			December 31,
			2014			2013
	Net sales
	Heavy Duty Diesel Systems		$	19,577		$	29,131
	Catalyst			23,772			25,823
	Eliminations (1)			-2,118			-3,153
	Total		$	41,231		$	51,801
	Income (loss) from operations
	Heavy Duty Diesel Systems		$	183		$	941
	Catalyst			-775			1,026
	Corporate			-6,894			-6,476
	Eliminations			-139			166
	Total		$	-7,625		$	-4,343
	Depreciation and amortization
	Heavy Duty Diesel Systems		$	872		$	989
	Catalyst			135			204
	Total		$	1,007		$	1,193
	Capital expenditures
	Heavy Duty Diesel Systems		$	116		$	41
	Catalyst			338			94
	Total		$	454		$	135
	(1) Elimination of Catalyst revenue related to sales to Heavy Duty Diesel Systems.
		December 31,
		2014			2013
	Total assets
	Heavy Duty Diesel Systems	$	41,234		$	40,691
	Catalyst		43,333			41,687
	Assets of discontinued operations held for sale		-			1,490
	Eliminations		-56,228			-55,499
	Total	$	28,339		$	28,369
	Net sales by geographic region based on location of sales organization is as follows (in thousands):
		Years Ended
		December 31,
		2014			2013
	United States	$	22,678		$	23,176
	Canada		14,300			23,913
	Europe		4,253			4,712
	Total international		18,553			28,625
	Total revenues	$	41,231		$	51,801
	Net fixed assets and total assets by geographic region as of December 31, 2014 and 2013 is as follows (in thousands):
		Fixed Assets						Total Assets
		2014			2013			2014		2013
	United States	$	723		$	522		$	14,618	$	12,371
	Canada		632			803			11,076		12,874
	Europe		2			47			2,645		3,124
	Total international		634			850			13,721		15,998
	Total revenues	$	1,357		$	1,372		$	28,339	$	28,369

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	18.    Discontinued Operations
	The Reno Business
	The Reno Business that the Company committed to sell in July 2014 is presented below as discontinued operations. Historically, the Reno Business was a component of the Company’s Heavy Duty Diesel Systems division. On October 20, 2014, the Company completed the sale of its Reno Business for $1.3 million in cash. The net assets held for sale of the Reno Business were eliminated from the Company’s balance sheet as of the sale date, and the Company recognized a gain of $0.2 million.
	The following table presents the major classes of the assets and liabilities of discontinued operations held for sale in the consolidated balance sheet as of December 31, 2013.
		December 31,
		2013
	Assets:
	Accounts receivable, net	$	379
	Inventories		634
	Prepaid expenses and other current assets		34
	Goodwill	$	1,047
	Property and equipment, net		87
	Intangible assets, net		70
	Goodwill		286
	Goodwill	$	443
	Total assets of discontinued operations held for sale	$	1,490
	Liabilities:
	Accounts payable	$	283
	Accrued expenses and other current liabilities		143
	Total liabilities of discontinued operations held for sale	$	426
	Net assets of discontinued operations held for sale	$	1,064
	Applied Utility Systems, Inc.
	On November 15, 2013, BP Products North America (“BP”) instituted claims against JM as the parent company of and purchaser of AUS, a former subsidiary of the Company. On May 12, 2010, JM tendered to the Company a claim for indemnification under the Asset Purchase Agreement, dated October 1, 2009, (the “Asset Purchase Agreement”) among JM, the Company and AUS. On June 11, 2013, BP, JM and the Company entered into a settlement agreement and mutual release pursuant to which they settled all claims. The settlement agreement had no material impact on the Company. Under the indemnification clauses of the Asset Purchase Agreement, the Company may be liable for legal expenses incurred by JM. These legal costs may be offset against funds withheld by JM from the acquisition of AUS.
	In connection with the Asset Purchase Agreement, JM presented the Company with an indemnification claim seeking recovery of the net amount of $0.9 million after offsetting the funds withheld by JM from the acquisition of AUS. These claims are for matters relating to various customer contracts that JM purchased, including the BP contract discussed above. The Company and JM have entered into discussions relating to the application of offsets and the validity of the claims presented. The Company initially offered a settlement amount of $0.2 million and had accrued for this estimated liability during 2013. Recently, the Company offered a settlement amount of $0.7 million, and as a result, an additional accrual for the increase in this estimated liability was recorded in discontinued operations during 2014. Since the discussions are ongoing, the ultimate costs associated with this matter cannot be determined at this time.
	In presenting discontinued operations for the Reno Business and AUS, general corporate overhead expenses that have been allocated historically to the Reno Business for segment presentation purposes are not included in discontinued operations. The following table presents revenue and expense information for discontinued operations for the years ended December 31, 2014 and 2013.
		Years Ended
		December 31,
		2014		2013
	Revenue	$	2,986	$	3,483
	Expenses (1)		-3,381		-3,725
	Gain on sale of the Reno Business		172		-
	Pre-tax loss (1)		-223		-242
	Income tax expense		-		13
	Net loss from discontinued operations	$	-223	$	-255
	(1) Includes accruals and related costs of $0.5 million and $0.3 million during the years ended December 31, 2014 and 2013, respectively, to increase the Company’s estimated liability to settle its ongoing indemnification matters with JM associated with the sale of AUS in 2009.

Subsequent_Event

Subsequent Event	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events [Text Block]	19.    Subsequent Event
	Expanding Commercialization Opportunities in the Asia Territory
	On March 13, 2015, the Company further amended its agreements with TKK and TCC to, among other things, enable it to sell in the Territory (i) coated substrates or certain catalytic materials utilizing the technology that the Company sold to TKK for a 4% royalty to TKK; (ii) coated substrates and certain catalytic materials utilizing solely new technology developed by the Company after it sold TKK the prior technology, as well as licenses of such technology related to catalysts for heavy-duty commercial vehicles and applications and light duty vehicles, for a 3% royalty to TKK; (iii) products used in vehicles without a royalty, provided that the ultimate user of the vehicle which contains the product purchases the vehicle outside the Territory; (iv) limited quantities of coated substrates or certain catalytic materials sold for the purpose of customer testing, evaluation and approval without a royalty; (v) limited quantities of coated substrates sold during an extended period of time after mass production ends for a specified vehicle model year program without a royalty.
	Pursuant to the terms of the amendment, once an aggregate amount of approximately $16.6 million in royalties has been paid by the Company to TKK, it may commercialize any technology without a royalty, including inside the Territory.

Accounting_Policies_by_Policy_

Accounting Policies, by Policy (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	a.       Principles of Consolidation
	The consolidated financial statements include the financial statements of the Company and its wholly owned subsidiaries. All significant inter-company balances and transactions have been eliminated in consolidation.
	Investments in which the Company has at least a 20%, but not more than a 50% interest are generally accounted for under the equity method. Investment interests below 20% are generally accounted for under the cost method, except if the Company could exercise significant influence, the investment would be accounted for under the equity method. The Company’s judgment regarding the level of influence over each equity method investment includes considering key factors such as the Company’s ownership interest, representation on the board of directors, participation in policy-making decisions and material intercompany transactions. The Company has an investment interest below 20% which is accounted for under the equity method. The Company includes its proportionate share of the net income or loss of equity-method investees in its consolidated statements of comprehensive loss. For additional information, refer to Note 15, “Equity Investments”.
Discontinued Operations, Policy [Policy Text Block]	b.       Discontinued Operations
	In July 2014, the Company committed to a plan to sell substantially all of the assets of its Reno Business, and the sale of this business was completed in October 2014. The sale of this non-core business is expected to increase the Company’s ability to fund key investments to broaden its growing intellectual property portfolio and to bring to market new products. The assets and liabilities of the Reno Business have been reclassified as held for sale and its operations are classified as discontinued operations for all periods presented in this report. Depreciation and amortization have been eliminated from discontinued operations from the date the Company committed to the plan to sell the Reno Business. In the statements of cash flows, the cash flows of discontinued operations are separately classified and aggregated.
	Discontinued operations also includes accruals and related costs for the Company’s estimated liability to settle its ongoing indemnification matters with Johnson Matthey (“JM”) associated with the sale of Applied Utility Systems, Inc. (“AUS”), a former subsidiary of the Company, in 2009.
	For additional information, refer to Note 18, “Discontinued Operations”.
	All discussions and amounts in the consolidated financial statements and related notes for all periods presented relate to continuing operations only, unless otherwise noted.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	c.        Concentration of Risk
	For the years ended December 31, 2014 and 2013, one automotive original equipment manufacturer (“OEM”) customer within the Catalyst segment accounted for 52% and 41%, respectively, of the Company’s revenues. This customer accounted for 50% and 26% of the Company’s accounts receivable at December 31, 2014 and 2013, respectively.
	For the periods presented below, certain vendors accounted for 10% or more of the Company’s raw material purchases as follows:
				Years Ended
				December 31,
	Vendor		Supplies	2014		2013
	A		Substrates	27%		18%
	B		Substrates	14%		14%
	C		Catalysts	10%		15%
	D		Rare Earth Materials	9%		12%
Use of Estimates, Policy [Policy Text Block]	d.       Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management of the Company to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. These estimates and assumptions are based on management’s best estimates and judgment. On an ongoing basis, the Company evaluates its estimates and assumptions, including those related to impairment of goodwill and long-lived assets, stock-based compensation, the fair value of financial instruments including warrants, allowance for doubtful accounts, inventory valuation, taxes and contingent and accrued liabilities. The Company bases its estimates on historical experience and various other factors, including the current economic environment, which it believes to be reasonable under the circumstances. Estimates and assumptions are adjusted when facts and circumstances dictate. Actual results may differ from these estimates under different assumptions and conditions. Management believes that the estimates are reasonable.
Cash and Cash Equivalents, Policy [Policy Text Block]	e.        Cash
	Cash consists of cash balances on hand and on deposit at banks. Cash on deposit at banks at times may exceed the FDIC limits. The Company believes no significant concentration of credit risk exists with respect to these cash balances.
Receivables, Policy [Policy Text Block]	f.         Accounts Receivable
	Accounts receivable are recorded at the invoiced amount and do not bear interest. Accounts receivable are presented net of a reserve for doubtful accounts of $0.3 million and $0.4 million at December 31, 2014 and 2013, respectively. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in the Company’s existing accounts receivable. The Company determines the allowance based on historical write-off experience and past due balances over 90 days that are reviewed individually for collectability. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. The Company does not have any off balance sheet credit exposure related to its customer.
Inventory, Policy [Policy Text Block]	g.       Inventories
	Inventories are stated at the lower of cost (FIFO method) or market (net realizable value). Finished goods inventory includes materials, labor and manufacturing overhead. The Company establishes provisions for inventory that is obsolete or when quantities on hand are in excess of estimated forecasted demand. The creation of such provisions results in a write-down of inventory to net realizable value and a charge to cost of sales.
	The Company’s inventory includes precious metals (platinum, palladium and rhodium) for use in the manufacturing of catalysts. The precious metals are valued at the lower of cost or market, consistent with the Company’s other inventory.
Property, Plant and Equipment, Policy [Policy Text Block]	h.       Property and Equipment
	Property and equipment is capitalized at cost and is stated at cost less accumulated depreciation and amortization. Depreciation and amortization is determined using the straight line method over the estimated useful lives of the various asset classes. Machinery and equipment are depreciated over 2 to 10 years; furniture and fixtures, computer hardware and software and vehicles are depreciated over 2 to 5 years. Property and equipment held under capital leases and leasehold improvements are amortized over the shorter of estimated useful lives or the lease term. Repairs and maintenance are charged to expense as incurred and major replacements or betterments are capitalized.
Goodwill and Intangible Assets, Policy [Policy Text Block]	i.         Goodwill and Intangible Assets
	Goodwill is the excess of the purchase price of an acquired entity over the fair value of net identified tangible and intangible assets acquired and is recorded in the reporting unit (operating segment or one level below operating segment) that is expected to benefit from the business combination. Goodwill is not amortized, but rather tested for impairment at least annually or more often whenever events or circumstances indicate that goodwill might be impaired. The Company performs its annual impairment test as of October 31.
	Goodwill is tested at the reporting unit level using a two-step impairment test. The first step is to compare the fair value of the reporting unit to its carrying value, including goodwill. If the carrying value of the reporting unit exceeds the fair value, a second step is performed in order to determine the amount of impairment loss, if any. The second step compares the implied fair value of the reporting unit’s goodwill with the carrying amount of that goodwill. If the carrying amount of the reporting unit’s goodwill exceeds its implied fair value, an impairment charge is recognized in an amount equal to that excess. Prior to performing the two-step impairment test, the Company may make a qualitative assessment of the likelihood of goodwill impairment in order to determine whether a detailed quantitative analysis is required.
	The Company’s Engine Control Systems reporting unit, which is within its Heavy Duty Diesel Systems reporting segment, contains all of the Company’s allocated goodwill. The Company performed Step 1 of the annual impairment test as of October 31, 2014 and determined that the fair value of the Company’s reporting unit (as determined using income and market approaches) was substantially greater than the carrying amount of the respective reporting unit, including goodwill, and Step 2 was not necessary; therefore, there was no impairment to the carrying amount of the reporting unit’s goodwill. The Company has recorded no impairment charges to date for this goodwill. The Company also determined that no subsequent events through December 31, 2014 triggered additional impairment testing; however, it is reasonably possible that future impairment tests may result in a different conclusion for the goodwill of the Engine Control Systems reporting unit. The estimate of fair value of the reporting units is sensitive to certain factors including but not limited to the following: movements in the Company’s share price, changes in discount rates and its cost of capital, growth of the reporting unit’s revenue, cost structure of the reporting unit, successful completion of research and development and customer acceptance of new products, expected changes in emissions regulations and approval of the reporting unit’s product by regulatory agencies.
	The Company’s intangible assets consist of trade names, acquired patents and technology, and customer relationships and have finite lives. Intangible assets are carried at cost, less accumulated amortization. Amortization is computed on a straight-line or accelerated basis over the estimated useful lives of the respective assets, ranging from 4 to 20 years.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	j.         Long Lived Assets
	Assets such as property and equipment and amortizable intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss is recognized when the sum of the expected undiscounted future net cash flows of an asset or asset group is less than its carrying amount and is measured as the amount by which the carrying amount of the asset or asset group exceeds its fair value.
Derivatives, Policy [Policy Text Block]	k.       Warrants and Derivative Liabilities
	The Company accounts for the issuance of Company derivative equity instruments in accordance with Accounting Standards Codification (“ASC”) 815-40 “Derivative and Hedging”. The Company reviews common stock purchase warrants at each balance sheet date based upon the characteristics and provision of each particular instrument and classifies them on the balance sheet as:
	·         Equity if they (i) require physical settlement or net-share settlement, or (ii) give the Company a choice of net-cash settlement or settlement in the Company’s own shares (physical settlement or net-share settlement), or as
	·         Liabilities if they (i) require net-cash settlement (including a requirement to net-cash settle the contract if an event occurs and if that event is outside the Company’s control), or (ii) give the counterparty a choice of net-cash settlement or settlement in shares (physical settlement of net-share settlement).
	The Company assesses classification of common stock purchase warrants and other freestanding derivatives at each reporting date to determine whether a change in classification between assets and liabilities and equity is required.
Income Tax, Policy [Policy Text Block]	l.         Income Taxes
	Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance against deferred tax assets is required if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The valuation allowance should be sufficient to reduce the deferred tax assets to the amount that is more likely than not to be realized.
	The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Changes in recognition or measurement are reflected in the period in which the change occurs. The Company records interest and penalties related to unrecognized tax benefit in income tax expense.
Revenue Recognition, Policy [Policy Text Block]	m.      Revenue Recognition
	Revenues are derived primarily from the sale of products. The Company generally recognizes revenue when products are shipped and the customer takes ownership and assumes risk of loss, collection of the relevant receivable is reasonably assured, persuasive evidence of an arrangement exists and the sales price is fixed or determinable. There are certain customers where risk of loss transfers at destination point and revenue is recognized when product is delivered to the destination. For these customers, revenue is recognized upon receipt at the customer’s warehouse. When terms of sale include subjective customer acceptance criteria, the Company defers revenue until the acceptance criteria are met. The determination of whether or not the customer acceptance terms are perfunctory or inconsequential impacts the amount and timing of the revenue recognized.
Cost of Sales, Policy [Policy Text Block]	n.       Cost of Revenue
	Cost of revenue includes direct material costs and factory labor as well as factory overhead expense. Indirect factory expense includes the costs of freight (inbound and outbound for direct materials and finished goods, respectively), purchasing and receiving, inspection, testing, warehousing, utilities and depreciation of facilities and equipment utilized in the production and distribution of products.
Selling, General and Administrative Expenses, Policy [Policy Text Block]	o.       Selling, General and Administrative Expense
	Selling, general and administrative expense includes the salary and benefits for sales, marketing and administrative staff as well as samples provided at no-cost to customers, marketing materials, travel, legal, accounting and tax consulting. Also included is any depreciation related to assets utilized in selling, general and administrative functions as well as amortization of acquired intangible assets.
Research and Development Expense, Policy [Policy Text Block]	p.       Research and Development
	Research and development costs are generally expensed as incurred. These expenses include the salary and benefits for the research and development staff as well as travel, research materials, testing and legal expense related to patenting intellectual property. Also included is any depreciation related to assets utilized in the development of new products.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	q.       Stock-Based Compensation
	Equity awards consist of stock options and restricted stock units (“RSUs”). The Company measures the compensation cost for all stock-based awards at fair value on the date of grant and recognizes it on a straight-line basis over the service period for awards expected to vest, which is generally three years.
	The Company measures the fair value of stock options using the Black-Scholes option-pricing model and certain assumptions, including the expected life of the stock options, an expected forfeiture rate and the expected volatility of its common stock. The fair value of RSUs is based on the closing price of the Company’s common stock on the grant date.
Standard Product Warranty, Policy [Policy Text Block]	r.        Product Warranty
	The Company provides for the estimated cost of product warranties in cost of sales, at the time product revenue is recognized. Warranty costs are estimated primarily using historical warranty information in conjunction with current engineering assessments applied to the Company’s expected repair or replacement costs.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	s.        Foreign Currency
	The functional currency of the Heavy Duty Diesel Systems division’s Engine Control Systems Limited subsidiary in Canada is the Canadian dollar, while that of its subsidiary Engine Control Systems Europe AB in Sweden is the Swedish krona and the division’s Clean Diesel Technologies Limited U.K. subsidiary, is the British pound sterling. The functional currency of the Catalyst division’s Japanese branch office and Asian investment is the Japanese Yen. Accordingly, the assets and liabilities of the foreign locations are translated into U.S. dollars at period-end exchange rates. Revenue and expense accounts are translated at the average exchange rates for the period. The resulting foreign currency exchange adjustments are charged or credited directly to other comprehensive income or loss as a separate component of stockholders’ equity. Unrealized foreign currency exchange gains and losses on certain intercompany transactions that are of a long-term investment nature (i.e. settlement is not planned or anticipated in the foreseeable future) are also recorded in other comprehensive income or loss in stockholders’ equity. Accumulated other comprehensive loss contained only foreign currency translation adjustments as of December 31, 2014 and 2013.
	The Company has exposure to multiple currencies. The primary exposure is between the U.S. dollar, the Canadian dollar, the Euro, British pound sterling and Swedish krona. Gains and losses arising from transactions denominated in currencies other than the functional currency of the entity are included in other income (expense) in the consolidated statements of comprehensive loss. Gains and losses arising from transactions denominated in foreign currencies are primarily related to inter-company loans that have been determined to be temporary in nature, cash, accounts receivable and accounts payable denominated in non-functional currencies.
Earnings Per Share, Policy [Policy Text Block]	t.         Net Loss per Share
	Basic net loss per share is computed using the weighted average number of common shares outstanding during the period. Diluted net loss per share is computed using the weighted average number of common shares and dilutive potential common shares. Dilutive potential common shares include employee stock options, RSUs, warrants and debt that are convertible into the Company’s common stock.
	Diluted net loss per share excludes certain dilutive potential common shares outstanding as their effect is anti-dilutive. Because the Company incurred net losses in the years ended December 31, 2014 and 2013, the effect of potentially dilutive securities has been excluded in the computation of net loss per share as their impact would be anti-dilutive. Potentially dilutive common stock equivalents excluded were 2.3 million and 2.6 million shares during the years ended December 31, 2014 and 2013, respectively.
Fair Value Measurement, Policy [Policy Text Block]	u.       Fair Value Measurements
	Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset and liability. As a basis for considering such assumptions, a fair value hierarchy has been established that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurement) and the lowest priority to unobservable inputs (level 3 measurements). The three levels of the fair value hierarchy are as follows:
	·         Level 1: Quoted prices (unadjusted) in active markets for identical assets or liabilities;
	·         Level 2: Inputs other than quoted prices included within Level 1 that are either directly or indirectly observable including quoted prices for similar instruments in active markets and quoted prices for identical or similar instruments in markets that are not active; and
	·         Level 3: Unobservable inputs in which little or no market activity exists, therefore requiring an entity to develop its own assumptions about the assumptions that market participants would use in pricing.
	The Company records its liability-classified warrants at fair value in accordance with the fair value measurement framework. The valuation inputs hierarchy classification for the warrant liability measured at fair value on a recurring basis is summarized as follows (in thousands):
	Warrant Liability		Level 1	Level 2		Level 3
	31-Dec-14		-	-		$	1,474
	31-Dec-13		-	-		$	939
	The following is a reconciliation of the warrant liability measured at fair value using Level 3 inputs (in thousands):
	Years Ended
		December 31,
	2014		2013
	Balance at beginning of period	$	939	$	10
	Issuance of common stock warrants		2,978		749
	Exercise of common stock warrants		-2,949		-
	Remeasurement of common stock warrants		506		180
	Balance at end of period	$	1,474	$	939
	For additional information regarding the liability-classified warrants, refer to Note 11, “Warrants”.
Fair Value of Financial Instruments, Policy [Policy Text Block]	v.        Fair Value of Financial Instruments
	ASC Topic 825, “Financial Instruments”,  requires disclosure of the fair value of financial instruments for which the determination of fair value is practicable. The fair values of the Company’s cash, trade accounts receivable, prepaid expenses and other current assets, accounts payable and accrued expenses and other current liabilities approximate carrying values due to the short maturity of these instruments. The fair value of borrowings under the line of credit approximates their carrying value due to the variable interest rates. The fair value of shareholder notes payable, calculated using level 3 inputs, including a Black-Scholes option-pricing model to value the debt’s conversion factor and a net present value model, was $7.7 million and $7.5 million at December 31, 2014 and 2013, respectively.
Reclassification, Policy [Policy Text Block]	w.      Reclassifications
	Certain prior-period amounts have been reclassified to conform to the current period presentation. These changes had no impact on the previously reported consolidated results of operations or stockholders' equity.
New Accounting Pronouncements, Policy [Policy Text Block]	x.       Recently Issued Accounting Guidance
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, "Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity". ASU 2014-08 raises the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. It is effective for annual reporting periods beginning on or after December 15, 2014. Early adoption is permitted but only for disposals that have not been reported in financial statements previously issued. The Company has not elected to early adopt, and it does not expect the impact of the adoption of ASU 2014-08 to be material to its consolidated financial statements.
	In May 2014, the FASB issued ASU No. 2014-09, "Revenue from Contracts with Customers". ASU 2014-09 supersedes the revenue recognition requirements in "Revenue Recognition (Topic 605)". ASU 2014-09 requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. It is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. ASU 2014-09 provides for either full retrospective adoption or a modified retrospective adoption by which it is applied only to the most current period presented. Early adoption is not permitted. The Company is currently in the process of evaluating the impact of the adoption of ASU 2014-09 on its consolidated financial statements.
	In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements-Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern”. ASU 2014-15 defines management's responsibility to assess an entity's ability to continue as a going concern, and to provide related footnote disclosures in certain circumstances. It is effective for annual reporting periods ending after December 15, 2016, and for annual and interim reporting periods thereafter. Early adoption is permitted. The Company is currently in the process of evaluating the impact of the adoption of ASU 2014-15 on its consolidated financial statements.

Significant_Accounting_Policie1

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]				Years Ended
				December 31,
	Vendor		Supplies	2014		2013
	A		Substrates	27%		18%
	B		Substrates	14%		14%
	C		Catalysts	10%		15%
	D		Rare Earth Materials	9%		12%
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]	Warrant Liability		Level 1	Level 2		Level 3
	31-Dec-14		-	-		$	1,474
	31-Dec-13		-	-		$	939
Schedule of Reconciliation of Warrants Liability [Table Text Block]
		Years Ended
		December 31,
	2014		2013
	Balance at beginning of period	$	939	$	10
	Issuance of common stock warrants		2,978		749
	Exercise of common stock warrants		-2,949		-
	Remeasurement of common stock warrants		506		180
	Balance at end of period	$	1,474	$	939

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of Inventory, Current [Table Text Block]
	December 31,
	2014		2013
	Raw materials	$	2,744	$	2,637
	Work in process		902		981
	Finished goods		2,652		1,667
	Inventories	$	6,298	$	5,285

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]
		December 31,
	2014		2013
	Buildings and improvements	$	233	$	676
	Furniture and fixtures		2,242		2,335
	Computer hardware and software		1,398		1,430
	Machinery and equipment		11,796		11,591
	Vehicles		58		37
	Property and equipment, Gross		15,727		16,069
	Less accumulated depreciation		-14,370		-14,697
	Property and equipment, Net	$	1,357	$	1,372

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	31-Dec-12	$	5,801
	Effect of translation adjustment		-217
	31-Dec-13		5,584
	Effect of translation adjustment		-407
	31-Dec-14	$	5,177
Schedule of Finite-Lived Intangible Assets [Table Text Block]		Useful Life
		in Years		December 31,
		2014		2013
	Trade name	15 - 20		$	1,293	$	1,352
	Patents and know-how	12-May			4,529		4,814
	Customer relationships	8-Apr			837		940
	Intangible assets, Gross				6,659		7,106
	Less accumulated amortization				-3,997		-3,668
	Intangible assets, Net			$	2,662	$	3,438
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Years ending December 31
	2015	$	594
	2016	$	492
	2017	$	482
	2018	$	166
	2019	$	166

Accrued_Expenses_and_Other_Cur1

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Accrued Expenses And Other Current Liabilities [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities [TableTextBlock]
		December 31,
	2014		2013
	Accrued salaries and benefits	$	1,115	$	1,146
	Accrued severance and other charges (1)		602		530
	Accrued legal settlement and related expenses (1)		-		616
	Accrued warranty (2)		373		453
	Warrant liability (3)		1,474		939
	Accrued indemnification settlement (4)		650		235
	Liability for consigned precious metals		565		832
	Other		1,410		1,108
	Accrued expenses and other current liabilities	$	6,189	$	5,859
	(1) For additional information, refer to Note 7, "Severance and Other Charges".
	(2) For additional information, refer to Note 8, "Accrued Warranty".
	(3) For additional information, refer to Note 11, "Warrants".
	(4) For additional information, refer to Note 18, "Discontinued Operations".

Severance_and_Other_Charges_Ta

Severance and Other Charges (Tables)	12 Months Ended
	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs [Table Text Block]		Years Ended
		December 31,
		2014		2013
	Employee severance expense	$	784	$	596
	Lease exit costs		117		27
	Legal settlements (1)		265		616
	Total severance and other charges	$	1,166	$	1,239
	(1) For additional information, refer to Note 16, "Commitments and Contingencies".
	Additionally, the Company also incurred $0.1 million related to the settlement
	of a customer dispute during the year ended December 31, 2014.
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]				Lease Exit
		Severance		Costs		Total
	31-Dec-12	$	306	$	184	$	490
	Provision		596		27		623
	Payments		-372		-211		-583
	31-Dec-13	$	530	$	-	$	530
	Provision		784		117		901
	Payments		-791		-38		-829
	31-Dec-14	$	523	$	79	$	602

Accrued_Warranty_Tables

Accrued Warranty (Tables)	12 Months Ended
	Dec. 31, 2014
Product Warranties Disclosures [Abstract]
Schedule of Product Warranty Liability [Table Text Block]		Years Ended
		December 31,
		2014		2013
	Balance at beginning of period	$	453	$	665
	Accrued warranty expense		480		540
	Warranty claims paid		-524		-707
	Translation adjustment		-36		-45
	Balance at end of period	$	373	$	453

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Debt [Table Text Block]			December 31,		December 31,
			2014		2013
	Line of credit with FGI		$	2,841	$	2,258
	$1.5 million, 8% shareholder note due 2016 (1)			1,598		1,586
	$3.0 million, 8% subordinated convertible shareholder notes due 2016 (1)			2,947		3,000
	$3.0 million, 8% shareholder note due 2016 (1)			2,931		2,963
	Debt, Total			10,317		9,807
	Less current portion			-2,841		-2,258
	Long-term debt, net of current portion		$	7,476	$	7,549
	(1) Debt discounts relate to warrants issued with shareholder notes and amendments. The aggregate amount of
	unamortized debt discount was $0.2 and $0.1 million at December 31, 2014 and 2013, respectively. For additional
	information, refer to the respective discussions below.
Schedule of Maturities of Long-term Debt [Table Text Block]	Years ending December 31:
	2015	$	2,841
	2016		7,650
	Total	$	10,491

Warrants_Tables

Warrants (Tables)	12 Months Ended
	Dec. 31, 2014
Warrants (Tables) [Line Items]
Schedule of Sharebased Compensation Warrants Activity [Table Text Block]				Weighted
				Average
				Exercise			Range of
		Shares		Price			Exercise Prices
	Outstanding at December 31, 2012	923,090		$	7.77		$2.09 - $48.90
	Issued	993,600		$	1.25		$1.25
	Cancelled (1)	-128,333		$	7.92		$7.92
	Expired	-648,822		$	8.4		$7.92 - $48.90
	Outstanding at December 31, 2013	1,139,535		$	1.68		$1.25 - $10.40
	Issued	1,448,964		$	3.32		$0.01 - $4.20
	Exercised	-968,571		$	1.03		$0.01 - $1.25
	Expired	-9,859		$	2.8		$2.80
	Outstanding and exercisable at December 31, 2014	1,610,069		$	3.54		$1.25 - $10.40
	(1) On September 30, 2013, the Company and Kanis S.A. agreed to cancel these warrants, originally issued on December 22, 2010 and scheduled to expire on December 22, 2013.
Black Scholes [Member] | Issued on April 4, 2014 [Member]
Warrants (Tables) [Line Items]
Schedule of Share Based Payment Award Warrants Valuation Assumptions [Table Text Block]					Issued
		December 31,			April 4,
		2014			2014
	Number of warrants		812,000			812,000
	CDTi stock price	$	1.81		$	2.95
	Strike price	$	4.2		$	4.2
	Expected volatility		86.60%			84.90%
	Risk-free interest rate		1.60%			1.90%
	Dividend yield		─			─
	Expected life in years		4.8			5.5
Black Scholes [Member] | Issued on November 4, 2014 [Member]
Warrants (Tables) [Line Items]
Schedule of Share Based Payment Award Warrants Valuation Assumptions [Table Text Block]		December 31,			Issued November 4, 2014
		2014			Series A			Series B
	Number of warrants		388,393			388,393			168,571
	CDTi stock price	$	1.81		$	3.04		$	3.04
	Strike price	$	3.25		$	3.25		$	0.01
	Expected volatility		86.50%			87.10%			149.00%
	Risk-free interest rate		1.60%			1.60%			0.10%
	Dividend yield		─			─			─
	Expected life in years		4.9			5			0.5
Monte Carlo Simulation Model [Member] | Issued on July 3, 2013 [Member]
Warrants (Tables) [Line Items]
Schedule of Share Based Payment Award Warrants Valuation Assumptions [Table Text Block]									Issued
			December 31,						July 3,
			2014			2013			2013
	Number of warrants			159,000			959,000			959,000
	CDTi stock price		$	1.81		$	1.51		$	1.15
	Strike price		$	1.25		$	1.25		$	1.25
	Expected volatility (1)			103.60%			73.60%			80.50%
	Risk-free interest rate			1.20%			1.80%			1.60%
	Dividend yield			─			─			─
	Expected life in years			3.5			4.5			5
	(1) During 2014, the Company's post-Merger historical volatility began to be considered representive of expected volatility going forward for these warrants.
Monte Carlo Simulation Model [Member] | Issued on November 11, 2014 [Member]
Warrants (Tables) [Line Items]
Schedule of Share Based Payment Award Warrants Valuation Assumptions [Table Text Block]					Issued
		December 31,			November 11,
		2014			2014
	Number of warrants		80,000			80,000
	CDTi stock price	$	1.81		$	2.46
	Strike price	$	1.75		$	1.75
	Expected volatility		77.00%			76.60%
	Risk-free interest rate		1.60%			1.70%
	Dividend yield		─			─
	Expected life in years		4.9			5

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]			Weighted Average		Weighted	Aggregate
			Exercise Price		Average	Intrinsic Value
					Remaining	(thousands)
					Contractual Term
		Options			(in years)
	Outstanding at December 31, 2013	714,712	$	7.17
	Exercised	-178,871	$	2.94
	Cancelled	-87,918	$	2.85
	Outstanding at December 31, 2014	447,923	$	8.74	6.1	$	-
	Exercisable at December 31, 2014	396,291	$	9.5	6	$	-
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]		Shares	Weighted
			Average
			Grant Date
			Fair Value
	Nonvested at December 31, 2013 (1)	285,558	$	2.35
	Granted	414,103	$	2.8
	Vested	-196,849	$	2.44
	Forfeited	-150,046	$	2.27
	Nonvested units at December 31, 2014	352,766	$	2.87
	(1) Excludes 26,638 RSUs vested and unissued

Other_Expense_Net_Tables

Other Expense, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Other Income and Expenses [Abstract]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]		Years Ended
		December 31,
		2014		2013
	Loss on change in fair value of liability-classified warrants	$	-506	$	-180
	Offering costs allocated to warrants issued		-293		-123
	Income (loss) from unconsolidated affiliates		46		-561
	Foreign currency exchange gain		549		56
	Other		30		52
	Other expense, net	$	-174	$	-756

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]		Years Ended
		December 31,
		2014		2013
	U.S.-based operations	$	-9,979	$	-8,556
	Non U.S.-based operations		1,004		2,053
	(Loss) income from continuing operations before income taxes	$	-8,975	$	-6,503
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]		Current		Deferred		Total
	Year ended December 31, 2014:
	U.S. Federal	$	4	$	-	$	4
	State and local		17		-		17
	Foreign		444		-327		117
	Total	$	465	$	-327	$	138
		Current		Deferred		Total
	Year ended December 31, 2013:
	U.S. Federal	$	-	$	-	$	-
	State and local		4		-		4
	Foreign		405		-69		336
	Total	$	409	$	-69	$	340
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]		Years Ended
		December 31,
		2014		2013
	Expected tax benefit	$	-3,052	$	-2,211
	Net tax effects of:
	Foreign tax rate differential		-214		-515
	State taxes, net of federal benefit		-381		-48
	Return to provision adjustment		-579		-270
	Research and other credits		-92		-139
	Permanent difference on Convertible Notes and warrants		277		61
	Expiring net operating loss carryforwards		2,441		-
	Permanent difference on deemed dividend		-		1,040
	Other		175		35
	Change in deferred tax asset valuation allowance		1,563		2,387
	Income tax expense (benefit) from continuing operations	$	138	$	340
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]		December 31,
		2014		2013
	Deferred tax assets:
	Research and development credits	$	2,054	$	1,824
	Other credits		378		378
	Operating loss carry forwards		13,974		12,592
	Inventories		282		338
	Allowance for doubtful accounts		321		118
	Depreciation		400		349
	Deferred research and development expenses for income tax		327		327
	Non-cash compensation		1,176		957
	Other		410		794
	Total gross deferred tax assets		19,322		17,677
	Valuation allowance		-18,856		-17,293
	Net deferred tax assets		466		384
	Deferred tax liabilities
	Other identifiable intangible assets		-825		-1,070
	Total gross deferred tax liabilities		-825		-1,070
	Net deferred tax liabilities	$	-359	$	-686
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]		Years Ended
		December 31,
		2014		2013
	Balance at beginning of year	$	543	$	452
	Additions for current year tax provisions		140		91
	Reduction for prior year tax provisions		-		-
	Balance at end of year	$	683	$	543
Summary of Income Tax Examinations [Table Text Block]		Open Tax Years
	United States – Federal	2011 – 2014
	United States – State	2010 – 2014
	Canada	2009 – 2014
	Sweden	2012 – 2014
	United Kingdom	2010 – 2014

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]	Years ending December 31:
	2015	$	640
	2016		571
	2017		408
	2018		353
	2019 and thereafter		3
	Total minimum lease payments	$	1,975

Segment_Reporting_Tables

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]			Years Ended
			December 31,
			2014			2013
	Net sales
	Heavy Duty Diesel Systems		$	19,577		$	29,131
	Catalyst			23,772			25,823
	Eliminations (1)			-2,118			-3,153
	Total		$	41,231		$	51,801
	Income (loss) from operations
	Heavy Duty Diesel Systems		$	183		$	941
	Catalyst			-775			1,026
	Corporate			-6,894			-6,476
	Eliminations			-139			166
	Total		$	-7,625		$	-4,343
	Depreciation and amortization
	Heavy Duty Diesel Systems		$	872		$	989
	Catalyst			135			204
	Total		$	1,007		$	1,193
	Capital expenditures
	Heavy Duty Diesel Systems		$	116		$	41
	Catalyst			338			94
	Total		$	454		$	135
	(1) Elimination of Catalyst revenue related to sales to Heavy Duty Diesel Systems.
		December 31,
		2014			2013
	Total assets
	Heavy Duty Diesel Systems	$	41,234		$	40,691
	Catalyst		43,333			41,687
	Assets of discontinued operations held for sale		-			1,490
	Eliminations		-56,228			-55,499
	Total	$	28,339		$	28,369
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]		Years Ended
		December 31,
		2014			2013
	United States	$	22,678		$	23,176
	Canada		14,300			23,913
	Europe		4,253			4,712
	Total international		18,553			28,625
	Total revenues	$	41,231		$	51,801
		Fixed Assets						Total Assets
		2014			2013			2014		2013
	United States	$	723		$	522		$	14,618	$	12,371
	Canada		632			803			11,076		12,874
	Europe		2			47			2,645		3,124
	Total international		634			850			13,721		15,998
	Total revenues	$	1,357		$	1,372		$	28,339	$	28,369

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations Balance Sheet [Table Text Block]		December 31,
		2013
	Assets:
	Accounts receivable, net	$	379
	Inventories		634
	Prepaid expenses and other current assets		34
	Goodwill	$	1,047
	Property and equipment, net		87
	Intangible assets, net		70
	Goodwill		286
	Goodwill	$	443
	Total assets of discontinued operations held for sale	$	1,490
	Liabilities:
	Accounts payable	$	283
	Accrued expenses and other current liabilities		143
	Total liabilities of discontinued operations held for sale	$	426
	Net assets of discontinued operations held for sale	$	1,064
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement [Table Text Block]		Years Ended
		December 31,
		2014		2013
	Revenue	$	2,986	$	3,483
	Expenses (1)		-3,381		-3,725
	Gain on sale of the Reno Business		172		-
	Pre-tax loss (1)		-223		-242
	Income tax expense		-		13
	Net loss from discontinued operations	$	-223	$	-255
	(1) Includes accruals and related costs of $0.5 million and $0.3 million during the years ended December 31, 2014 and 2013, respectively, to increase the Company’s estimated liability to settle its ongoing indemnification matters with JM associated with the sale of AUS in 2009.

Organization_Details

Organization (Details) (USD $)	0 Months Ended		12 Months Ended		0 Months Ended	3 Months Ended	0 Months Ended
	Oct. 20, 2014	Jul. 03, 2013	Dec. 31, 2014	Dec. 31, 2013	Apr. 04, 2014	Mar. 31, 2014	Nov. 04, 2014	Nov. 11, 2014	Dec. 31, 2012	15-May-12
Organization (Details) [Line Items]
Retained Earnings (Accumulated Deficit)			($191,055,000)	($181,719,000)
Long-term Line of Credit			2,841,000	2,258,000
Shelf Registration Authorized Amount										50,000,000
Shelf Registartion Public Float Threshold										75,000,000
Shelf Registration Units Sold (in Shares)		1,730,000
Shelf Registration Unit Price (in Dollars per share)		$1.25
Proceeds from Warrant Exercises			1,000,000
Proceeds from Divestiture of Businesses	1,300,000		1,328,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)				34,600
Share Price (in Dollars per share)			$1.81					$2.46
Proceeds from Issuance of Private Placement				99,000
Cash			7,220,000	3,909,000					6,878,000
Series A Warrants [Member] | Common Stock [Member] | Subscription Agreement [Member]
Organization (Details) [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)							$3.25
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)							388,393
Share Price (in Dollars per share)							$2.80
Series A Warrants [Member] | Subscription Agreement [Member]
Organization (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in Shares)							0.28
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)							$3.25
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)							388,393
Share Price (in Dollars per share)							$2.80
Series A Warrants [Member]
Organization (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)			388,393
Series B Warrants [Member] | Common Stock [Member] | Subscription Agreement [Member]
Organization (Details) [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)							$0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)							168,571
Share Price (in Dollars per share)							$2.79
Series B Warrants [Member] | Subscription Agreement [Member]
Organization (Details) [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)							$0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)							168,571
Share Price (in Dollars per share)							$2.79
Series B Warrants [Member]
Organization (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)			168,571
Common Stock [Member] | Subscription Agreement [Member]
Organization (Details) [Line Items]
Stock Subscription Agreement,Number of Shares to be Purchased (in Shares)							1,385,000
Common Stock [Member] | Shelf Registration [Member]
Organization (Details) [Line Items]
Shelf Registration Units Sold Share Component Per Unit (in Shares)		1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in Shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)		$1.25
Shelf Registration [Member]
Organization (Details) [Line Items]
Shelf Registration Units Sold (in Shares)					2,030,000
Shelf Registration Unit Price (in Dollars per share)					$3.40
Shelf Registration Units Sold Share Component Per Unit (in Shares)					1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in Shares)					1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)					$4.20	$1.25
Proceeds from Issuance of Common Stock and Warrants		1,700,000			6,100,000
Warrants Exercised During the Period (in Shares)						800,000
Proceeds from Warrant Exercises						1,000,000
Subscription Agreement [Member]
Organization (Details) [Line Items]
Stock Subscription Agreement,Number of Shares to be Purchased (in Shares)							1,385,000
Proceeds from Issuance of Private Placement							3,800,000
Line Of Credit With FGI [Member]
Organization (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			7,500,000
Long-term Line of Credit			2,800,000
Line of Credit Facility, Current Borrowing Capacity			4,700,000
Reno Business [Member]
Organization (Details) [Line Items]
Proceeds from Divestiture of Businesses	$1,300,000

Significant_Accounting_Policie2

Significant Accounting Policies (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies (Details) [Line Items]
Cost Method Investment Ownership Percentage Description	20%
Provision for Doubtful Accounts (in Dollars)	$0.30	$0.40
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares)	2.3	2.6
Notes Payable, Fair Value Disclosure (in Dollars)	$7.70	$7.50
Machinery and Equipment [Member] | Minimum [Member]
Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Machinery and Equipment [Member] | Maximum [Member]
Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Computer, Hardware and Software [Member] | Minimum [Member]
Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Computer, Hardware and Software [Member] | Maximum [Member]
Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Vehicles [Member] | Minimum [Member]
Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Vehicles [Member] | Maximum [Member]
Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Furniture and Fixtures [Member] | Minimum [Member]
Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Furniture and Fixtures [Member] | Maximum [Member]
Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	5 years
OEM Customer [Member] | Catalyst [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Significant Accounting Policies (Details) [Line Items]
Concentration Risk, Percentage	52.00%	41.00%
OEM Customer [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Significant Accounting Policies (Details) [Line Items]
Concentration Risk, Percentage	50.00%	26.00%
Minimum [Member]
Significant Accounting Policies (Details) [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
Finite-Lived Intangible Asset, Useful Life	4 years
Maximum [Member]
Significant Accounting Policies (Details) [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Finite-Lived Intangible Asset, Useful Life	20 years
Supplier Concentration Risk [Member]
Significant Accounting Policies (Details) [Line Items]
Concentration Risk, Percentage	10.00%

Significant_Accounting_Policie3

Significant Accounting Policies (Details) - Concentration of risk raw materials purchases (Supplier Concentration Risk [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Concentration Risk [Line Items]
Purchase of Raw Material, Concentration of Risk, Percentage	10.00%
Vendor A [Member]
Concentration Risk [Line Items]
Supplies	Substrates
Purchase of Raw Material, Concentration of Risk, Percentage	27.00%	18.00%
Vendor B [Member]
Concentration Risk [Line Items]
Supplies	Substrates
Purchase of Raw Material, Concentration of Risk, Percentage	14.00%	14.00%
Vendor C [Member]
Concentration Risk [Line Items]
Supplies	Catalysts
Purchase of Raw Material, Concentration of Risk, Percentage	10.00%	15.00%
Vendor D [Member]
Concentration Risk [Line Items]
Supplies	Rare Earth Materials
Purchase of Raw Material, Concentration of Risk, Percentage	9.00%	12.00%

Significant_Accounting_Policie4

Significant Accounting Policies (Details) - Valuation inputs hierarchy classification for the warrant liability measured at fair value on a recurring basis (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Inputs, Level 1 [Member]
Significant Accounting Policies (Details) - Valuation inputs hierarchy classification for the warrant liability measured at fair value on a recurring basis [Line Items]
Warrant liability
Fair Value, Inputs, Level 2 [Member]
Significant Accounting Policies (Details) - Valuation inputs hierarchy classification for the warrant liability measured at fair value on a recurring basis [Line Items]
Warrant liability
Fair Value, Inputs, Level 3 [Member]
Significant Accounting Policies (Details) - Valuation inputs hierarchy classification for the warrant liability measured at fair value on a recurring basis [Line Items]
Warrant liability	$1,474	$939

Significant_Accounting_Policie5

Significant Accounting Policies (Details) - Reconciliation of the warrant liability measured at fair value using Level 3 inputs (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of the warrant liability measured at fair value using Level 3 inputs [Abstract]
Balance at beginning of period	$939	$10
Issuance of common stock warrants	2,978	749
Exercise of common stock warrants	-2,949
Remeasurement of common stock warrants	506	180
Balance at end of period	$1,474	$939

Inventories_Details_Componets_

Inventories (Details) - Componets of Inventory (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Componets of Inventory [Abstract]
Raw materials	$2,744	$2,637
Work in process	902	981
Finished goods	2,652	1,667
Inventories	$6,298	$5,285

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Depreciation	$0.40	$0.50

Property_and_Equipment_Details1

Property and Equipment (Details) - Property and equipment (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$15,727	$16,069
Less accumulated depreciation	-14,370	-14,697
Property and equipment, Net	1,357	1,372
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	233	676
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	2,242	2,335
Computer, Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	1,398	1,430
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	11,796	11,591
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$58	$37

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$0.60	$0.70

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets (Details) - Goodwill (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Abstract]
Balance	$5,177	$5,584	$5,801
Effect of translation adjustment	($407)	($217)

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets (Details) - Intangible assets (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	6,659	$7,106
Less accumulated amortization	-3,997	-3,668
Intangible assets, Net	2,662	3,438
Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Useful life	15 years
Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Useful life	20 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	1,293	1,352
Patents [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Useful life	5 years
Patents [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Useful life	12 years
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	4,529	4,814
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Useful life	4 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Useful life	8 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	837	$940
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Useful life	4 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Useful life	20 years

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets (Details) - Estimated amortization expense (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Estimated amortization expense [Abstract]
2015	$594
2016	492
2017	482
2018	166
2019	$166

Accrued_Expenses_and_Other_Cur2

Accrued Expenses and Other Current Liabilities (Details) - Accrued expenses and other current liabilities (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accrued Expenses And Other Current Liabilities [Abstract]
Accrued salaries and benefits	$1,115	$1,146
Accrued severance and other charges (1)	602	530	490
Accrued legal settlement and related expenses (1)		616
Accrued warranty (2)	373	453	665
Warrant liability (3)	1,474	939	10
Accrued indemnification settlement (4)	650	235
Liability for consigned precious metals	565	832
Other	1,410	1,108
Accrued expenses and other current liabilities	$6,189	$5,859

Severance_and_Other_Charges_De

Severance and Other Charges (Details) - Severance and other charges (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Total severance and other charges	$1,166	$1,239
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and other charges	784	596
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and other charges	117	27
Legal Settlement [Member]
Restructuring Cost and Reserve [Line Items]
Total severance and other charges	$265	$616

Severance_and_Other_Charges_De1

Severance and Other Charges (Details) - Company`s accrual for severance and other charges (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Severance and Other Charges (Details) - Company`s accrual for severance and other charges [Line Items]
Balance	$602	$530	$490
Provision	901	623
Payments	-829	-583
Employee Severance [Member]
Severance and Other Charges (Details) - Company`s accrual for severance and other charges [Line Items]
Balance	523	530	306
Provision	784	596
Payments	-791	-372
Contract Termination [Member]
Severance and Other Charges (Details) - Company`s accrual for severance and other charges [Line Items]
Balance	79		184
Provision	117	27
Payments	($38)	($211)

Accrued_Warranty_Details_Chang

Accrued Warranty (Details) - Changes in the Company`s product warranty reserve (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Changes in the Company`s product warranty reserve [Abstract]
Balance at beginning of period	$453	$665
Accrued warranty expense	480	540
Warranty claims paid	-524	-707
Translation adjustment	-36	-45
Balance at end of period	$373	$453

Debt_Details

Debt (Details) (USD $)	0 Months Ended					12 Months Ended
	Jun. 30, 2013	Jul. 03, 2013	Jul. 27, 2012	Feb. 16, 2012	Apr. 08, 2011	Dec. 31, 2014	Dec. 31, 2013	Nov. 11, 2014	Dec. 30, 2010	6-May-11
Debt (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)							34,600
Common Stock [Member] | 1.5 million 8% Shareholder Note Due 2016 [Member] | Premium And Accrued Interest Payment [Member]
Debt (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)		94,000
Termination Agreement [Member] | FGI Facility [Member]
Debt (Details) [Line Items]
Due to Related Parties, Current						400,000
1.5 million 8% Shareholder Note Due 2016 [Member] | Premium And Accrued Interest Payment [Member]
Debt (Details) [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)		1.25
1.5 million 8% Shareholder Note Due 2016 [Member] | Original Loan Repayment [Member]
Debt (Details) [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)		10.4
1.5 million 8% Shareholder Note Due 2016 [Member] | Minimum [Member]
Debt (Details) [Line Items]
Debt Instrument, Periodic Payment	100,000
1.5 million 8% Shareholder Note Due 2016 [Member] | Maximum [Member]
Debt (Details) [Line Items]
Debt Instrument, Unamortized Premium	200,000
1.5 million 8% Shareholder Note Due 2016 [Member]
Debt (Details) [Line Items]
Debt Instrument, Face Amount									1,500,000
Debt Instrument, Interest Rate, Stated Percentage	8.00%								6.00%
Debt Instrument, Periodic Payment	100,000
Debt Instrument, Unamortized Premium	250,000
Interest Payable	135,000
Stock Issued During Period Shares Issued for Payment of Premium and Interest (in Shares)		188,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)		25,000						80,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)								$1.75
8% Subordinated Convertible Shareholder Notes Due 2016 [Member]
Debt (Details) [Line Items]
Debt Instrument, Face Amount										3,000,000
Debt Instrument, Interest Rate, Stated Percentage										8.00%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)				5,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)				$3.80
Debt Instrument Maturity Period						5 years
Debt Instrument Maturity Acceleration Notice Period to be Served by Lender						30 days
Debt Instrument, Convertible, Conversion Price (in Dollars per share)			$4		$7.04
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger					120.00%
Debt Conversion, Converted Instrument, Shares Issued (in Shares)			250,000		369,853
DebtInstrument Convertible Threshold Notice Period			75 days
Class of Warrant or Right Expiry Description				the earlier of (i) August 16, 2017 or (ii) that date that is 30 days after the Company gives notice to the warrant holder that the market value of one share of its common stock has exceeded 130% of the exercise price of the warrant for 10 consecutive days on or after August 16, 2014.
3.0 million 8% Shareholder Note Due 2016 [Member]
Debt (Details) [Line Items]
Debt Instrument, Face Amount			3,000,000
Debt Instrument, Interest Rate, Stated Percentage			8.00%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)			45,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)			$2.09
Debt Instrument, Maturity Date						27-Jul-15
FGI Facility [Member]
Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						7,500,000
Line of Credit Facility, Expiration Date						15-Aug-15
Line of Credit Facility Optional Additional Term						1 year
Line of Credit Facility Threshold Percentage of Purchase Receivables Elected by Issuer						80.00%
Line of Credit Facility Purchased Receivable Reserved by Borrower						20.00%
Line of Credit Facility Advance Amount in Percentage of Purchased Accounts Receivable Value						80.00%
Line of Credit Facility Maximum Borrowing Capacity Against Inventory Collateral						1,500,000
Line of Credit Facility Inventory Collateral Sublimit Determinant Percentage of Aggregate Purchase Price for Purchased Receivable						50.00%
Line of Credit Facility Interest Rate Determinant Threshold Percentage						6.50%
Debt Instrument, Basis Spread on Variable Rate						2.50%
Line of Credit Facility Periodic Collateral Fees Percentage of Eligible Receivables						0.30%
Line of Credit Facility Periodic Collateral Fees Percentage of Borrowing Against Inventory Collateral						0.38%
Line of Credit Facility Amount Outstanding Standby Fees Determination Threshold						2,400,000
Line of Credit Facility Standby Fees Percentage of Determinant Rate						0.44%
Line of Credit Facility Standby Fees Determinant Rate						80.00%
Line of Credit Facility, Entry Facility Fee Amount						75,000
Line of Credit Facility, Amendment Facility Fee Amount						75,000
Line of Credit Facility Termination Fee Percentage						2.00%
Line of Credit Facility Termination Fee Waiver Notification Period						10 days
Line of Credit Facility Notification Period for Termination Fee Waiver Threshold Reserve Percentage for Accounts						40.00%
Line of Credit Facility Termination Fee Waiver Threshold Consecutive Days						30 days
Pledged Assets Accounts Receivable Pledged as Collateral Gross Value						2,200,000
Borrowings Outstanding Amount Against Pledged Accounts Receivable						1,600,000
Borrowings Outstanding Amount Against Pleged Inventory						1,200,000
OEM Customer Inventory Borrowing [Member]
Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						200,000

Debt_Details_Components_of_Deb

Debt (Details) - Components of Debt (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt (Details) - Components of Debt [Line Items]
Line of credit with FGI	$2,841	$2,258
Debt, Total	10,317	9,807
Less current portion	-2,841	-2,258
Long-term debt, net of current portion	7,476	7,549
1.5 million 8% Shareholder Note Due 2016 [Member]
Debt (Details) - Components of Debt [Line Items]
Shareholder Note Due 2016	1,598	1,586
3.0 Million 8% Subordinated Convertible Shareholder Notes Due 2016 [Member]
Debt (Details) - Components of Debt [Line Items]
$3.0 million, 8% subordinated convertible shareholder notes due 2016 (1)	2,947	3,000
3.0 million 8% Shareholder Note Due 2016 [Member]
Debt (Details) - Components of Debt [Line Items]
Shareholder Note Due 2016	$2,931	$2,963

Debt_Details_Annual_scheduled_

Debt (Details) - Annual scheduled principal payments of debt (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Annual scheduled principal payments of debt [Abstract]
2015	$2,841
2016	7,650
Total	$10,491

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	0 Months Ended		12 Months Ended		0 Months Ended
	Nov. 04, 2014	Apr. 04, 2014	Dec. 31, 2014	Dec. 31, 2013	Jun. 28, 2013	Nov. 11, 2014	Jul. 03, 2013	Jul. 03, 2015	Apr. 01, 2014	Oct. 07, 2011	15-May-12
Stockholders' Equity (Details) [Line Items]
Shelf Registration Authorized Amount (in Dollars)											$50,000,000
Shelf Registartion Public Float Threshold (in Dollars)											75,000,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				34,600
Share Price (in Dollars per share)			$1.81			$2.46
Proceeds from Issuance of Common Stock (in Dollars)			9,923,000	1,839,000
Gross Proceeds from Public Offering (in Dollars)	4,400,000	6,900,000
Proceeds from Public Offering Net of Discounts and Commissions and Expenses (in Dollars)	3,800,000	6,100,000
Stock Issued During Period, Value, New Issues (in Dollars)			7,380,000	1,123,000
Fair Value Adjustment of Warrants (in Dollars)			506,000	180,000
Director [Member] | Private Placement [Member]
Stockholders' Equity (Details) [Line Items]
Stock Issued During Period, Value, New Issues (in Dollars)					100,000
Shares Issued, Price Per Share (in Dollars per share)					$1.84
Stock Issued During Period, Shares, New Issues					54,347
Kanis S.A. [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						80,000	94,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)						$1.75	$1.25
Stock Issued During Period, Shares, New Issues							188,000
Debt Instrument, Periodic Payment, Interest (in Dollars)							235,000
Class of Warrant or Rights Period from Issuance Date for which Warrants or Rights Exercisable						5 years	5 years
Private Placement [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			94,000
Series A Warrants [Member] | Subscription Agreement [Member] | Common Stock [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	388,393
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)	$3.25
Share Price (in Dollars per share)	$2.80
Series A Warrants [Member] | Subscription Agreement [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	388,393
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)	$3.25
Share Price (in Dollars per share)	$2.80
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	0.28
Series A Warrants [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			388,393
Series B Warrants [Member] | Subscription Agreement [Member] | Common Stock [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	168,571
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)	$0.01
Share Price (in Dollars per share)	$2.79
Series B Warrants [Member] | Subscription Agreement [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	168,571
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)	$0.01
Share Price (in Dollars per share)	$2.79
Series B Warrants [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			168,571
Warrant [Member] | Underwriting Agreement [Member] | Over-Allotment Option [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					120,000
Warrant [Member] | Underwriting Agreement [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)				$1.25
Proceeds from Issuance or Sale of Equity (in Dollars)				700,000
Fees and Commissions (in Dollars)				100,000
Warrant [Member] | Placement Agent Agreement [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights									812,000
Public Offering Warrant Component Per Unit Sold		0.4
Warrant [Member]
Stockholders' Equity (Details) [Line Items]
Fair Value Adjustment of Warrants (in Dollars)	1,300,000	1,500,000
Underwriting Expenses and Offering Costs Related to Offering Warrants (in Dollars)	100,000	200,000
Common Stock Including Additional Paid in Capital [Member]
Stockholders' Equity (Details) [Line Items]
Stock Issued During Period, Value, New Issues (in Dollars)	2,500,000	4,600,000
Underwriting Agreement [Member] | Common Stock [Member]
Stockholders' Equity (Details) [Line Items]
Underwriting Agreement Shares Authorized					1,600,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					800,000
Underwriting Agreement Additional Shares Offering					240,000
Sale of Stock, Number of Shares Issued in Transaction								1,730,000
Sale of Stock, Price Per Share (in Dollars per share)								$1.25
Proceeds from Issuance or Sale of Equity (in Dollars)				1,000,000
Underwriting Agreement [Member] | Over-Allotment Option [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								65,000
Sale of Stock, Number of Shares Issued in Transaction								130,000
Share Price (in Dollars per share)								$1.25
Underwriting Agreement [Member] | Offering [Member]
Stockholders' Equity (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								865,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)								$0.01
Underwriting Agreement [Member]
Stockholders' Equity (Details) [Line Items]
Underwriting Agreement Period Granted for Additional Stock Purchase					30 years
Gross Proceeds from Underwriting (in Dollars)				2,200,000
Proceeds from Issuance of Common Stock (in Dollars)				1,700,000
Placement Agent Agreement [Member] | Common Stock [Member]
Stockholders' Equity (Details) [Line Items]
Public Offering Number of Shares Authorized to be Offered									2,030,000
Public Offering Share Component Per Unit Sold		1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right		1
Public Offering Units Sold Price Per Unit		3.4
Subscription Agreement [Member] | Common Stock [Member]
Stockholders' Equity (Details) [Line Items]
Stock Subscription Agreement,Number of Shares to be Purchased	1,385,000
Subscription Agreement [Member]
Stockholders' Equity (Details) [Line Items]
Stock Subscription Agreement,Number of Shares to be Purchased	1,385,000
Purchase Agreement with LPC [Member]
Stockholders' Equity (Details) [Line Items]
Stock Purchase Agreement Authorized Amount (in Dollars)										$10,000,000
Stock Purchase Agreement Period in Force										30 months

Warrants_Details

Warrants (Details)	1 Months Ended
	Jul. 31, 2013	Apr. 30, 2014	Nov. 30, 2014	Dec. 31, 2013	Dec. 31, 2014
Warrants (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				34,600
Private Placement [Member]
Warrants (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					94,000
959,000 Warrants Issued as Liability on July, 2013 [Member]
Warrants (Details) [Line Items]
Warrants Issued During Period	959,000
34,600 Warrants Issued as Equity on July, 2013 [Member]
Warrants (Details) [Line Items]
Warrants Issued During Period	34,600
812,000 Warrants Issued as Liability on April, 2014 [Member]
Warrants (Details) [Line Items]
Warrants Issued During Period		812,000
556,964 Warrants Issued as Liability on November, 2014 [Member]
Warrants (Details) [Line Items]
Warrants Issued During Period			556,964
80,000 Warrants Issued as Liability on November, 2014 [Member]
Warrants (Details) [Line Items]
Warrants Issued During Period			80,000
Series A Warrants [Member]
Warrants (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					388,393
Series B Warrants [Member]
Warrants (Details) [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					168,571

Warrants_Details_Warrant_activ

Warrants (Details) - Warrant activity (USD $)	0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Warrants (Details) - Warrant activity [Line Items]
Warrants Outstanding (in Shares)	923,090	1,610,069	1,139,535
Warrants Outstanding, Weighted Average Exercise Prices	$7.77	$3.54	$1.68
Warrants Issued (in Shares)		1,448,964	993,600
Warrants Issued, Weighted Average Exercise Prices		$3.32	$1.25
Warrants Issued, Range of Exercise Prices			$1.25
Exercised (in Shares)		-968,571
Exercised		$1.03
Cancelled (1) (in Shares)			-128,333
Cancelled (1)			$7.92
Cancelled (1)			$7.92
Warrants Expired (in Shares)		-9,859	-648,822
WarrantsExpired, Weighted Average Exercise Prices		$2.80	$8.40
Warrants Expired, Range of Exercise Prices		$2.80
Minimum [Member]
Warrants (Details) - Warrant activity [Line Items]
Warrants Outstanding, Range of Exercise Prices	$2.09	$1.25	$1.25
Warrants Issued, Range of Exercise Prices		$0.01
Exercised		$0.01
Warrants Expired, Range of Exercise Prices			$7.92
Maximum [Member]
Warrants (Details) - Warrant activity [Line Items]
Warrants Outstanding, Range of Exercise Prices	$48.90	$10.40	$10.40
Warrants Issued, Range of Exercise Prices		$4.20
Exercised		$1.25
Warrants Expired, Range of Exercise Prices			$48.90

Warrants_Details_Assumptions_i

Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability (USD $)	10 Months Ended	12 Months Ended	3 Months Ended
	Nov. 11, 2014	Dec. 31, 2014	Apr. 04, 2014	Dec. 31, 2013
Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)				34,600
CDTi stock price (in Dollars per share)	$2.46	$1.81
Strike price (in Dollars per share)	$1.75	$1.75
Expected volatility	76.60%	77.00%
Risk-free interest rate	1.70%	1.60%
Dividend yield
Expected life in years	5 years	4 years 328 days
Black Scholes [Member] | Warrant [Member] | Issued on April 4, 2014 [Member]
Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)		812,000	812,000
CDTi stock price (in Dollars per share)		$1.81	$2.95
Strike price (in Dollars per share)		$4.20	$4.20
Expected volatility		86.60%	84.90%
Risk-free interest rate		1.60%	1.90%
Dividend yield
Expected life in years		4 years 292 days	5 years 6 months

Warrants_Details_Assumptions_i1

Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability (USD $)	10 Months Ended	12 Months Ended	10 Months Ended
	Nov. 11, 2014	Dec. 31, 2014	Nov. 04, 2014	Dec. 31, 2013
Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)				34,600
CDTi stock price (in Dollars per share)	$2.46	$1.81
Strike price (in Dollars per share)	$1.75	$1.75
Expected volatility	76.60%	77.00%
Risk-free interest rate	1.70%	1.60%
Dividend yield
Expected life in years	5 years	4 years 328 days
Series A Warrants [Member] | Black Scholes [Member] | Issued on November 4, 2014 [Member]
Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)			388,393
CDTi stock price (in Dollars per share)			$3.04
Strike price (in Dollars per share)			$3.25
Expected volatility			87.10%
Risk-free interest rate			1.60%
Dividend yield
Expected life in years			5 years
Series A Warrants [Member]
Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)		388,393
Series B Warrants [Member] | Black Scholes [Member] | Issued on November 4, 2014 [Member]
Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)			168,571
CDTi stock price (in Dollars per share)			$3.04
Strike price (in Dollars per share)			$0.01
Expected volatility			149.00%
Risk-free interest rate			0.10%
Dividend yield
Expected life in years			6 months
Series B Warrants [Member]
Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)		168,571
Black Scholes [Member] | Warrant [Member] | Issued on November 4, 2014 [Member]
Warrants (Details) - Assumptions in Black Scholes option-pricing model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)		388,393
CDTi stock price (in Dollars per share)		$1.81
Strike price (in Dollars per share)		$3.25
Expected volatility		86.50%
Risk-free interest rate		1.60%
Dividend yield
Expected life in years		4 years 328 days

Warrants_Details_Assumptions_i2

Warrants (Details) - Assumptions in Monte Carlo simulation model to estimate the fair value of the warrant liability (USD $)	10 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Nov. 11, 2014	Dec. 31, 2014	Jul. 03, 2013	Dec. 31, 2013
Warrants (Details) - Assumptions in Monte Carlo simulation model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)				34,600
CDTi stock price (in Dollars per share)	$2.46	$1.81
Strike price (in Dollars per share)	$1.75	$1.75
Expected volatility (1)	76.60%	77.00%
Risk-free interest rate	1.70%	1.60%
Dividend yield
Expected life in years	5 years	4 years 328 days
Monte Carlo Simulation Model [Member] | Warrant [Member] | Issued on July 3, 2013 [Member]
Warrants (Details) - Assumptions in Monte Carlo simulation model to estimate the fair value of the warrant liability [Line Items]
Number of warrants (in Shares)		159,000	959,000	959,000
CDTi stock price (in Dollars per share)		$1.81	$1.15	$1.51
Strike price (in Dollars per share)		$1.25	$1.25	$1.25
Expected volatility (1)		103.60%	80.50%	73.60%
Risk-free interest rate		1.20%	1.60%	1.80%
Dividend yield
Expected life in years		3 years 6 months	5 years	4 years 6 months

Warrants_Details_Assumptions_i3

Warrants (Details) - Assumptions in Monte Carlo simulation model to estimate the fair value of the warrant liability (USD $)	10 Months Ended	12 Months Ended
	Nov. 11, 2014	Dec. 31, 2014
Assumptions in Monte Carlo simulation model to estimate the fair value of the warrant liability [Abstract]
Number of warrants (in Shares)	80,000	80,000
CDTi stock price (in Dollars per share)	$2.46	$1.81
Strike price (in Dollars per share)	$1.75	$1.75
Expected volatility	76.60%	77.00%
Risk-free interest rate	1.70%	1.60%
Dividend yield
Expected life in years	5 years	4 years 328 days

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	149,708
Share-based Compensation	$639,000	$667,000
Employee Stock Option [Member]
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 328 days
Maximum [Member]
Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	1,400,000

StockBased_Compensation_Detail1

Stock-Based Compensation (Details) - Stock option activity (Employee Stock Option [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Employee Stock Option [Member]
Stock-Based Compensation (Details) - Stock option activity [Line Items]
Outstanding at December 31, 2013	714,712
Outstanding at December 31, 2013	$7.17
Exercised	-178,871
Exercised	$2.94
Cancelled	-87,918
Cancelled	$2.85
Outstanding at December 31, 2014	447,923
Outstanding at December 31, 2014	$8.74
Outstanding at December 31, 2014	6 years 36 days
Outstanding at December 31, 2014
Exercisable at December 31, 2014	396,291
Exercisable at December 31, 2014	$9.50
Exercisable at December 31, 2014	6 years
Exercisable at December 31, 2014

StockBased_Compensation_Detail2

Stock-Based Compensation (Details) - RSU activity (USD $)	12 Months Ended
	Dec. 31, 2014
RSU activity [Abstract]
Nonvested at December 31, 2013 (1)	285,558
Nonvested at December 31, 2013 (1)	$2.35
Granted	414,103
Granted	$2.80
Vested	-196,849
Vested	$2.44
Forfeited	-150,046
Forfeited	$2.27
Nonvested units at December 31, 2014	352,766
Nonvested units at December 31, 2014	$2.87

Other_Expense_Net_Details_Othe

Other Expense, Net (Details) - Other (expense) income, net (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other (expense) income, net [Abstract]
Loss on change in fair value of liability-classified warrants	($506)	($180)
Offering costs allocated to warrants issued	-293	-123
Income (loss) from unconsolidated affiliates	46	-561
Foreign currency exchange gain	549	56
Other	30	52
Other expense, net	($174)	($756)

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Taxes (Details) [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	34.00%
Operating Loss Carryforwards	$2,441,000
Deferred Tax Assets, Tax Credit Carryforwards, Research	2,054,000	1,824,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	200,000	200,000
Next Five Years [Member] | United States – Federal [Member] | Operating Loss Carryforwards Limitation [Member]
Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	400,000
Following Fifteen Years [Member] | United States – Federal [Member] | Operating Loss Carryforwards Limitation [Member]
Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	200,000
Twenty Years [Member] | State and Local Jurisdiction [Member] | Operating Loss Carryforwards Limitation [Member]
Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	100,000
United States – Federal [Member] | Operating Loss Carryforwards Limitation [Member]
Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	5,400,000
United States – Federal [Member]
Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	34,400,000
Operating Loss Carryforwards, Expiration Year	2034
Deferred Tax Assets, Tax Credit Carryforwards, Research	300,000
State and Local Jurisdiction [Member] | Operating Loss Carryforwards Limitation [Member]
Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	1,100,000
State and Local Jurisdiction [Member]
Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	20,400,000
Operating Loss Carryforwards, Expiration Year	2034
Deferred Tax Assets, Tax Credit Carryforwards, Research	2,700,000
Foreign Tax Authority [Member]
Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	$4,600,000

Income_Taxes_Details_Loss_inco

Income Taxes (Details) - (Loss) income from continuing operations before income taxes (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
(Loss) income from continuing operations before income taxes [Abstract]
U.S.-based operations	($9,979)	($8,556)
Non U.S.-based operations	1,004	2,053
(Loss) income from continuing operations before income taxes	($8,975)	($6,503)

Income_Taxes_Details_Income_ta

Income Taxes (Details) - Income tax expense (benefit) attributable to loss from continuing operations (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income tax expense (benefit) attributable to loss from continuing operations [Abstract]
Current Federal Tax Expense (Benefit)	$4
Deferred Federal Income Tax Expense (Benefit)
Total Federal Income Tax Expense	4
Current State and local Tax Expense (Benefit)	17	4
Deferred State and local Tax Expense (Benefit)
Total State and local Income Tax Expense (Benefit)	17	4
Current Foreign Tax Expense (Benefit)	444	405
Deferred Foreign Income Tax Expense (Benefit)	-327	-69
Total Foreign Income Tax Expense (Benefit)	117	336
Total Current Tax Expense (Benefit)	465	409
Total Deferred Income Tax Expense (Benefit)	-327	-69
Total Income Tax Expense (Benefit)	$138	$340

Income_Taxes_Details_Component

Income Taxes (Details) - Component of Income tax Reconciliation (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Component of Income tax Reconciliation [Abstract]
Expected tax benefit	($3,052)	($2,211)
Net tax effects of:
Foreign tax rate differential	-214	-515
State taxes, net of federal benefit	-381	-48
Return to provision adjustment	-579	-270
Research and other credits	-92	-139
Permanent difference on Convertible Notes and warrants	277	61
Expiring net operating loss carryforwards	2,441
Permanent difference on deemed dividend		1,040
Other	175	35
Change in deferred tax asset valuation allowance	1,563	2,387
Income tax expense (benefit) from continuing operations	$138	$340

Income_Taxes_Details_Deferred_

Income Taxes (Details) - Deferred tax assets and liabilities (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Research and development credits	$2,054	$1,824
Other credits	378	378
Operating loss carry forwards	13,974	12,592
Inventories	282	338
Allowance for doubtful accounts	321	118
Depreciation	400	349
Deferred research and development expenses for income tax	327	327
Non-cash compensation	1,176	957
Other	410	794
Total gross deferred tax assets	19,322	17,677
Valuation allowance	-18,856	-17,293
Net deferred tax assets	466	384
Deferred tax liabilities
Other identifiable intangible assets	-825	-1,070
Total gross deferred tax liabilities	-825	-1,070
Net deferred tax liabilities	($359)	($686)

Income_Taxes_Details_Changes_o

Income Taxes (Details) - Changes occurred in the amount of unrecognized tax benefits (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Changes occurred in the amount of unrecognized tax benefits [Abstract]
Balance at beginning of year	$543	$452
Additions for current year tax provisions	140	91
Reduction for prior year tax provisions
Balance at end of year	$683	$543

Income_Taxes_Details_Multiple_

Income Taxes (Details) - Multiple tax jurisdictions, both within and outside of the United States	12 Months Ended
	Dec. 31, 2014
United States – Federal [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2011
United States – Federal [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2014
United States – State [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2010
United States – State [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2014
Canada [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2009
Canada [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2014
Sweden [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2012
Sweden [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2014
United Kingdom [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2010
United Kingdom [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Open Tax Year	2014

Equity_Investments_Details

Equity Investments (Details)

12 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

Dec. 31, 2013

Apr. 30, 2013

Apr. 30, 2013

Feb. 28, 2013

Feb. 28, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Feb. 28, 2013

Feb. 28, 2008

Dec. 31, 2014

Dec. 31, 2008

Dec. 31, 2009

Dec. 31, 2013

Other Expense [Member]

Corporate Joint Venture [Member]

Corporate Joint Venture [Member]

Corporate Joint Venture [Member]

Corporate Joint Venture [Member]

Corporate Joint Venture [Member]

Corporate Joint Venture [Member]

Corporate Joint Venture [Member]

Corporate Joint Venture [Member]

Corporate Joint Venture [Member]

Corporate Joint Venture [Member]

TKK [Member]

Sale of Shares in TCC to TKK [Member]

Sale and Transfer of Specific Three Way Catalyst and Zero Platinum Group Metal Patents to TKK [Member]

Other Assets [Member]

Corporate Joint Venture [Member]

USD ($)

EUR (€)

USD ($)

EUR (€)

USD ($)

EUR (€)

USD ($)

EUR (€)

Corporate Joint Venture [Member]

USD ($)

USD ($)

USD ($)

Equity Investments (Details) [Line Items]

Equity Method Investment, Ownership Percentage

50.00%

50.00%

Payments to Acquire Interest in Joint Venture

$66,000

€ 50,000

$361,000

€ 262,000

Payments for Advance to Affiliate

261,000

200,000

Gain Loss on Joint Venture

600,000

1,200,000

-900,000

Investments in and Advances to Affiliates, Amount of Equity

100,000

Sale of Stock, Percentage of Ownership after Transaction

30.00%

5.00%

Related Party Transaction, Amounts of Transaction

5,600,000

Payments to Related Parties

$300,000

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended		0 Months Ended			1 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Jul. 21, 2014	Mar. 13, 2014	Sep. 27, 2013	Apr. 30, 2014
Commitments and Contingencies (Details) [Line Items]
Operating Leases, Expiration Year	2020
Operating Leases, Rent Expense	$1	$1
Sales And Use Tax Audit [Member]
Commitments and Contingencies (Details) [Line Items]
Loss Contingency, Range of Possible Loss, Maximum	0.8	1.5
Loss Contingency, Actions Taken by Court, Arbitrator or Mediator			The D&R’s conclusion was that the basis for the calculation of the aforementioned $1.5 million tax due should be reduced from $12.2 million to $9.0 million with a commensurate reduction in the tax owed to the State.
Administrative Complaint by Former CFO [Member]
Commitments and Contingencies (Details) [Line Items]
Loss Contingency Damages Awarded					On September 27, 2013, the U.S. DOL issued preliminary findings on the matter concluding there was reasonable cause to support the former employee’s claims and ordering the Company to pay damages in excess of $1.9 million and take certain other actions.
Litigation Settlement, Amount				0.4
Stock Issued During Period, Shares, New Issues (in Shares)						75,000
Accrued Liabilities, Current		0.6
Loss Contingency, Loss in Period						$0.10

Commitments_and_Contingencies_2

Commitments and Contingencies (Details) - Future minimum lease payments under non-cancelable operating leases (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Future minimum lease payments under non-cancelable operating leases [Abstract]
2015	$640
2016	571
2017	408
2018	353
2019 and thereafter	3
Total minimum lease payments	$1,975

Segment_Reporting_Details

Segment Reporting (Details)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Number of Operating Segments	2

Segment_Reporting_Details_Comp

Segment Reporting (Details) - Company`s reportable segments (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Net sales
Net Sales	$41,231	$51,801
Income (loss) from operations
Income (loss) from operations	-7,625	-4,343
Depreciation and amortization
Depreciation and amortization	1,007	1,193
Capital expenditures
Capital expenditures	454	135
Total assets
Assets	28,339	28,369
Assets of discontinued operations held for sale		1,490
Operating Segments [Member] | Heavy Duty Diesel Systems [Member]
Net sales
Net Sales	19,577	29,131
Income (loss) from operations
Income (loss) from operations	183	941
Depreciation and amortization
Depreciation and amortization	872	989
Capital expenditures
Capital expenditures	116	41
Total assets
Assets	41,234	40,691
Operating Segments [Member] | Catalyst [Member]
Net sales
Net Sales	23,772	25,823
Income (loss) from operations
Income (loss) from operations	-775	1,026
Depreciation and amortization
Depreciation and amortization	135	204
Capital expenditures
Capital expenditures	338	94
Operating Segments [Member] | Corporate Segment [Member]
Income (loss) from operations
Income (loss) from operations	-6,894	-6,476
Total assets
Assets	43,333	41,687
Intersegment Eliminations [Member]
Net sales
Net Sales	-2,118	-3,153
Income (loss) from operations
Income (loss) from operations	-139	166
Total assets
Assets	($56,228)	($55,499)

Segment_Reporting_Details_Net_

Segment Reporting (Details) - Net sales and assets by geographic region (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$41,231	$51,801
Fixed Assets	1,357	1,372
Total Assets	28,339	28,369
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	22,678	23,176
Fixed Assets	723	522
Total Assets	14,618	12,371
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	14,300	23,913
Fixed Assets	632	803
Total Assets	11,076	12,874
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,253	4,712
Fixed Assets	2	47
Total Assets	2,645	3,124
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	18,553	28,625
Fixed Assets	634	850
Total Assets	$13,721	$15,998

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	0 Months Ended	12 Months Ended
	Oct. 20, 2014	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations (Details) [Line Items]
Proceeds from Divestiture of Businesses	$1,300,000	$1,328,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	200,000
Asset Purchase Agreement [Member]
Discontinued Operations (Details) [Line Items]
Disposal Group, Including Discontinued Operation, Increase in Estimated Litigation Reserve			900,000
Payments for Legal Settlements			200,000
Litigation Settlement, Amount		$700,000

Discontinued_Operations_Detail1

Discontinued Operations (Details) - Major classes of the assets and liabilities (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:
Accounts receivable, net	$379
Inventories	634
Prepaid expenses and other current assets	34
Goodwill	1,047
Property and equipment, net	87
Intangible assets, net	70
Goodwill	286
Goodwill	443
Total assets of discontinued operations held for sale	1,490
Liabilities:
Accounts payable	283
Accrued expenses and other current liabilities	143
Total liabilities of discontinued operations held for sale	426
Net assets of discontinued operations held for sale	$1,064

Discontinued_Operations_Detail2

Discontinued Operations (Details) - Revenue and expense information (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Revenue and expense information [Abstract]
Revenue	$2,986	$3,483
Expenses (1)	-3,381	-3,725
Gain on sale of the Reno Business	172
Pre-tax loss (1)	-223	-242
Income tax expense		13
Net loss from discontinued operations	($223)	($255)

Subsequent_Event_Details

Subsequent Event (Details) (TKK [Member], Subsequent Event [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 12, 2015
Subsequent Event (Details) [Line Items]
Royalty Expense (in Dollars)	16.6
Prior Technology [Member]
Subsequent Event (Details) [Line Items]
Royalty Expense, Percentage	4.00%
Solely New Technology [Member]
Subsequent Event (Details) [Line Items]
Royalty Expense, Percentage	3.00%