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Stock-Based Compensation - Summary of Outstanding Stock Options by Exercise Price Range (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Options (in shares) | 1,546,500 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Weighted- Average Remaining Contractual Life (in years) | 3 years 6 months 0 days
Weighted- Average Exercise Price (in dollars per share) | $ 11.62 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Number of Options (in shares) | 1,546,500 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Weighted- Average Exercise Price (in dollars per share) | $ 11.62 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 2.76 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 27.57 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MaximumMember
$ 3.55 - $ 5.51 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Options (in shares) | 296,500 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange1Member
Weighted- Average Remaining Contractual Life (in years) | 7 years 7 months 15 days
Weighted- Average Exercise Price (in dollars per share) | $ 4.57 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange1Member
Number of Options (in shares) | 296,500 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange1Member
Weighted- Average Exercise Price (in dollars per share) | $ 4.57 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange1Member
$ 3.55 - $ 5.51 | Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 3.55 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange1Member
$ 3.55 - $ 5.51 | Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 5.51 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange1Member
$ 5.52 - $11.03 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Options (in shares) | 735,875 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange2Member
Weighted- Average Remaining Contractual Life (in years) | 3 years 1 month 0 days
Weighted- Average Exercise Price (in dollars per share) | $ 8.94 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange2Member
Number of Options (in shares) | 735,875 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange2Member
Weighted- Average Exercise Price (in dollars per share) | $ 8.94 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange2Member
$ 5.52 - $11.03 | Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 5.52 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange2Member
$ 5.52 - $11.03 | Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 11.03 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange2Member
$11.04 - $22.06 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Options (in shares) | 267,250 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange3Member
Weighted- Average Remaining Contractual Life (in years) | 1 year 2 months 12 days
Weighted- Average Exercise Price (in dollars per share) | $ 14.57 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange3Member
Number of Options (in shares) | 267,250 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange3Member
Weighted- Average Exercise Price (in dollars per share) | $ 14.57 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange3Member
$11.04 - $22.06 | Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 11.04 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange3Member
$11.04 - $22.06 | Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 22.06 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange3Member
$22.07 - $27.57 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Options (in shares) | 246,875 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange4Member
Weighted- Average Remaining Contractual Life (in years) | 1 year 11 months 5 days
Weighted- Average Exercise Price (in dollars per share) | $ 24.87 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange4Member
Number of Options (in shares) | 246,875 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange4Member
Weighted- Average Exercise Price (in dollars per share) | $ 24.87 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange4Member
$22.07 - $27.57 | Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 22.07 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange4Member
$22.07 - $27.57 | Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of Exercise Prices (in dollars per share) | $ 27.57 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = ftek_ExercisePriceRange4Member

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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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