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Organization and Significant Accounting Policies - Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Balance at January 1 | $ 1,772 | $ 1,922 | $ 1,189
Provision charged to expense | 172 | 0 | 1,099
Write-offs / Recoveries | (375) | (150) | (366)
Balance at December 31 | $ 1,569 | $ 1,772 | $ 1,922

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- Definition Amount of direct write-downs or recoveries of receivables charged against the allowance for doubtful accounts. + References No definition available. + Details
Name: | ftek_AllowanceForDoubtfulAccountsReceivableChargeoffsRecoveries
Namespace Prefix: | ftek_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Provision for Doubtful Accounts, Including Foreign Impact Of Foreign Exchange + References No definition available. + Details
Name: | ftek_ProvisionforDoubtfulAccountsIncludingForeignImpactOfForeignExchange
Namespace Prefix: | ftek_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration