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Share Repurchase Program - Share Repurchase Programs (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 13 Months Ended | 1 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Mar. 31, 2012 | Jun. 30, 2012 | Sep. 30, 2012
Phase One Program |  |  |  |  |  |  |  |
Total Number of Shares Purchased | 2,306,590 us-gaap_StockRepurchasedDuringPeriodShares |  | 2,306,590 us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |  |
Average Price Paid Per Share |  |  | $ 5.20 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |  |
Total Cost |  | $ 7,889 us-gaap_StockRepurchasedDuringPeriodValue | $ 12,000 us-gaap_StockRepurchasedDuringPeriodValue |  |  |  |  |
August 25, 2011 through September 30, 2011 |  |  |  |  |  |  |  |
Phase One Program |  |  |  |  |  |  |  |
Total Number of Shares Purchased |  |  |  | 571,554 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_CreationDateAxis = ftek_August252011ThroughSeptember302011Member |  |  |  |
Average Price Paid Per Share |  |  |  | $ 5.89 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_CreationDateAxis = ftek_August252011ThroughSeptember302011Member |  |  |  |
Total Cost |  |  |  | 3,367 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_CreationDateAxis = ftek_August252011ThroughSeptember302011Member |  |  |  |
Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program |  |  |  | 2,633 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_CreationDateAxis = ftek_August252011ThroughSeptember302011Member |  |  |  |
October 1, 2011 through December 31, 2011 |  |  |  |  |  |  |  |
Phase One Program |  |  |  |  |  |  |  |
Total Number of Shares Purchased |  |  |  |  | 130,160 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_CreationDateAxis = ftek_October12011ThroughDecember312011Member |  |  |
Average Price Paid Per Share |  |  |  |  | $ 5.71 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_CreationDateAxis = ftek_October12011ThroughDecember312011Member |  |  |
Total Cost |  |  |  |  | 744 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_CreationDateAxis = ftek_October12011ThroughDecember312011Member |  |  |
Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program |  |  |  |  | 1,889 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_CreationDateAxis = ftek_October12011ThroughDecember312011Member |  |  |
January 1, 2012 through March 31, 2012 |  |  |  |  |  |  |  |
Phase One Program |  |  |  |  |  |  |  |
Total Number of Shares Purchased |  |  |  |  |  | 334,636 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_CreationDateAxis = ftek_January12012ThroughMarch312012Member |  |
Average Price Paid Per Share |  |  |  |  |  | $ 5.64 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_CreationDateAxis = ftek_January12012ThroughMarch312012Member |  |
Total Cost |  |  |  |  |  | 1,889 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_CreationDateAxis = ftek_January12012ThroughMarch312012Member |  |
April 1, 2012 through June 30, 2012 |  |  |  |  |  |  |  |
Phase One Program |  |  |  |  |  |  |  |
Total Number of Shares Purchased |  |  |  |  |  |  | 1,124,797 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_CreationDateAxis = ftek_April12012ThroughJune302012Member |
Average Price Paid Per Share |  |  |  |  |  |  | $ 4.70 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_CreationDateAxis = ftek_April12012ThroughJune302012Member |
Total Cost |  |  |  |  |  |  | 5,290 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_CreationDateAxis = ftek_April12012ThroughJune302012Member |
Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program |  |  |  |  |  |  | 710 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_CreationDateAxis = ftek_April12012ThroughJune302012Member |
Period |  |  |  |  |  |  |  |
Phase One Program |  |  |  |  |  |  |  |
Total Number of Shares Purchased |  |  |  |  |  |  |  | 145,443 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_CreationDateAxis = ftek_July12012throughSeptember302012Member
Average Price Paid Per Share |  |  |  |  |  |  |  | $ 4.88 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_CreationDateAxis = ftek_July12012throughSeptember302012Member
Total Cost |  |  |  |  |  |  |  | $ 710 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_CreationDateAxis = ftek_July12012throughSeptember302012Member

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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