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Stock-Based Compensation (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 1,960,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2,462us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years) 1 year 9 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares) 60,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 195,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years) 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (in years) 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 2.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 1.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 1.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Share Price (in dollars per share) $ 3.83us-gaap_SharePrice    
Proceeds from Stock Options Exercised 297us-gaap_ProceedsFromStockOptionsExercised 811us-gaap_ProceedsFromStockOptionsExercised 0us-gaap_ProceedsFromStockOptionsExercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 103us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) 266,091us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod 394,938us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value (in Dollars per share) 1,553us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 1,728us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue  
Allocated Share-based Compensation Expense 2,322us-gaap_AllocatedShareBasedCompensationExpense 1,798us-gaap_AllocatedShareBasedCompensationExpense 1,306us-gaap_AllocatedShareBasedCompensationExpense
Second Anniversary of Award Date      
Percent of Options Vesting 50.00%ftek_PercentOfOptionsVesting
/ us-gaap_CreationDateAxis
= ftek_SecondAnniversaryOfAwardDateMember		    
Third Anniversary of Award Date      
Percent of Options Vesting 25.00%ftek_PercentOfOptionsVesting
/ us-gaap_CreationDateAxis
= ftek_ThirdAnniversaryOfAwardDateMember		    
Fourth Anniversary of Award Date      
Percent of Options Vesting 25.00%ftek_PercentOfOptionsVesting
/ us-gaap_CreationDateAxis
= ftek_FourthAnniversaryOfAwardDateMember		    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years) 2 years    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years) 4 years    
Non-Vested Stock Options      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= ftek_NonVestedStockOptionsMember		    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 2.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ftek_NonVestedStockOptionsMember		    
The First Type of Restriced Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years) 3 years    
The Second Type of Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years) 2 years    
The Second Type of Restricted Stock Units | Second Anniversary of Award Date      
Percent of Options Vesting 67.00%ftek_PercentOfOptionsVesting
/ us-gaap_AwardTypeAxis
= ftek_TheSecondTypeOfRestrictedStockUnitsMember
/ us-gaap_CreationDateAxis
= ftek_SecondAnniversaryOfAwardDateMember		    
The Second Type of Restricted Stock Units | Third Anniversary of Award Date      
Percent of Options Vesting 33.00%ftek_PercentOfOptionsVesting
/ us-gaap_AwardTypeAxis
= ftek_TheSecondTypeOfRestrictedStockUnitsMember
/ us-gaap_CreationDateAxis
= ftek_ThirdAnniversaryOfAwardDateMember		    
The Third Type of Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years) 2 years    
The Third Type of Restricted Stock Units | Second Anniversary of Award Date      
Percent of Options Vesting 67.00%ftek_PercentOfOptionsVesting
/ us-gaap_AwardTypeAxis
= ftek_TheThirdTypeOfRestrictedStockUnitsMember
/ us-gaap_CreationDateAxis
= ftek_SecondAnniversaryOfAwardDateMember		    
The Third Type of Restricted Stock Units | Third Anniversary of Award Date      
Percent of Options Vesting 33.00%ftek_PercentOfOptionsVesting
/ us-gaap_AwardTypeAxis
= ftek_TheThirdTypeOfRestrictedStockUnitsMember
/ us-gaap_CreationDateAxis
= ftek_ThirdAnniversaryOfAwardDateMember		    
Restricted Stock Units (RSUs)      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 2,462us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years) 1 year 10 months 0 days    
Allocated Share-based Compensation Expense 2,086us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 2,043us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 1,314us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Deferred directors fees      
Allocated Share-based Compensation Expense $ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ftek_DeferredDirectorsFeesMember		 $ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ftek_DeferredDirectorsFeesMember		 $ 58us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ftek_DeferredDirectorsFeesMember
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards      
Common Stock, Capital Shares Reserved for Future Issuance 4,483,525us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_StatementClassOfStockAxis
= ftek_ReservedForIssuanceUponExerciseOrVestingOfEquityAwardsMember		 2,460,516us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_StatementClassOfStockAxis
= ftek_ReservedForIssuanceUponExerciseOrVestingOfEquityAwardsMember