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Business Segment and Geographic Disclosures (Detail) - Reporting Segment Net Sales and Gross Margin (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revenues from external customers | $ 15,103 us-gaap_Revenues | $ 18,661 us-gaap_Revenues
Cost of sales | (8,437)us-gaap_CostOfRevenue | (10,810)us-gaap_CostOfRevenue
Gross margin | 6,666 us-gaap_GrossProfit | 7,851 us-gaap_GrossProfit
Selling, general and administrative | (8,203)us-gaap_SellingGeneralAndAdministrativeExpense | (8,744)us-gaap_SellingGeneralAndAdministrativeExpense
Research and development | (872)us-gaap_ResearchAndDevelopmentExpense | (244)us-gaap_ResearchAndDevelopmentExpense
Operating loss | (2,409)us-gaap_OperatingIncomeLoss | (1,137)us-gaap_OperatingIncomeLoss
Air Pollution Control Segment |  |
Revenues from external customers | 6,857 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 10,734 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Cost of sales | (4,321)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | (7,030)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Gross margin | 2,536 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 3,704 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Selling, general and administrative | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Research and development | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Operating loss | 2,536 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 3,704 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
FUEL CHEM Segment |  |
Revenues from external customers | 8,246 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 7,927 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Cost of sales | (4,116)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | (3,780)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Gross margin | 4,130 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 4,147 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Selling, general and administrative | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Research and development | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Operating loss | 4,130 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 4,147 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Other |  |
Revenues from external customers | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Cost of sales | 0 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | 0 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Gross margin | 0 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | 0 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Selling, general and administrative | (8,203)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | (8,744)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Research and development | (872)us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | (244)us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Operating loss | $ (9,075)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | $ (8,988)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51677171&loc=d3e3636-108311 + Details
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