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Revenue Recognition Policy (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 unit contract | Dec. 31, 2012 contract
Number of contracts in progress that were identified as a loss contract (in contracts) | 2 | 2
Loss on contract termination | $ 1 | $ 57
Unbilled receivables, current | 22,569 | 15,661
Billings in excess of cost, current | $ 1,614 | $ 1,703
Number of units with APC technology (in units) | 700 |
Minimum [Member] |  |
Contract term (in months) | 8 months |
Critical operational measurements (in measurements) | 3 |
Maximum [Member] |  |
Contract term (in months) | 16 months |
Critical operational measurements (in measurements) | 4 |

X
- Definition Length of contract + References No definition available. + Details
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Namespace Prefix: | ftek_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Critical Operational Measurements + References No definition available. + Details
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Namespace Prefix: | ftek_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Contracts in Progress that were Identified as a Loss Contract + References No definition available. + Details
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Namespace Prefix: | ftek_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Units with APC Technology + References No definition available. + Details
Name: | ftek_NumberofUnitswithAPCTechnology
Namespace Prefix: | ftek_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57788-111642 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 45 -Paragraph 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 45 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The loss recognized on termination of a contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 275 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6471736&loc=d3e54681-109401 + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition The amount due for services rendered or products shipped, but not yet billed, recognized in conformity with revenue recognition criteria. This element is distinct from unbilled contracts receivables because this is based on noncontract transactions. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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