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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The components of stock-based compensation for the three and six months ended June 30, 2018 and 2017 were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Stock options and restricted stock units, net of forfeited | $ | 97 |  |  | $ | 1,166 |  |  | $ | 38 |  |  | $ | 1,156 |
Tax benefit of stock-based compensation expense | — |  |  | — |  |  | — |  |  | — |
After-tax effect of stock-based compensation | $ | 97 |  |  | $ | 1,166 |  |  | $ | 38 |  |  | $ | 1,156 |
Schedule of Stock Option Activity | Stock option activity for Fuel Tech’s Incentive Plans for the six months ended June 30, 2018 was as follows:
|  | Number of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding on January 1, 2018 |  | 1,116,750 |  |  | $ | 6.34 |  |  |  |  |
Granted |  | — |  |  | — |  |  |  |  |
Exercised |  | — |  |  | — |  |  |  |  |
Expired or forfeited |  | (147,750 | ) |  | 15.16 |  |  |  |  |
Outstanding on June 30, 2018 |  | 969,000 |  |  | $ | 4.99 |  |  | 4.99 |  | $ | 20,240 |
Exercisable on June 30, 2018 |  | 969,000 |  |  | $ | 4.99 |  |  | 4.99 |  | $ | 20,240 |
Schedule of Nonvested Restricted Stock Units Activity | A summary of restricted stock unit activity for the six months ended June 30, 2018 is as follows:
|  | Shares |  | Weighted Average Grant Date Fair Value
Unvested restricted stock units at January 1, 2018 |  | 1,359,162 |  |  | $ | 1.28 |
Granted |  | — |  |  | — |
Forfeited |  | (199,995 | ) |  | 1.59 |
Vested |  | (48,890 | ) |  | 1.59 |
Unvested restricted stock units at June 30, 2018 |  | 1,110,277 |  |  | $ | 1.21 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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