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Business Segment and Geographic Disclosures (Detail) - Operations by Geographic Area (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revenues: |  |
Revenues | $ 15,103 us-gaap_Revenues | $ 18,661 us-gaap_Revenues
United States |  |
Revenues: |  |
Revenues | 12,575 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 9,229 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Foreign |  |
Revenues: |  |
Revenues | $ 2,528 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = ftek_ForeignMember | $ 9,432 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = ftek_ForeignMember

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=ftek_ForeignMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |