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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The components of stock-based compensation for the three months ended March 31, 2020 and 2019 were as follows:
| Three Months Ended March 31,
| 2020 | 2019
Stock options and restricted stock units, net of forfeited | $ | 81 |  | $ | 96 |
Tax benefit of stock-based compensation expense | — |  | — |
After-tax effect of stock-based compensation | $ | 81 |  | $ | 96 |
Schedule of Stock Option Activity | Stock option activity for Fuel Tech’s Incentive Plans for the three months ended March 31, 2020 was as follows:
| Number of Options | Weighted- Average Exercise Price | Weighted- Average Remaining Contractual Term | Aggregate Intrinsic Value
Outstanding on January 1, 2020 | 747,500 |  | $ | 3.33 |  |  |
Granted | — |  | — |  |  |
Exercised | — |  | — |  |  |
Expired or forfeited | — |  | — |  |  |
Outstanding on March 31, 2020 | 747,500 |  | $ | 3.33 |  | 4.48 | $ | — |
Exercisable on March 31, 2020 | 747,500 |  | $ | 3.33 |  | 4.48 | $ | — |
Schedule of Nonvested Restricted Stock Units Activity | A summary of restricted stock unit activity for the three months ended March 31, 2020 is as follows:
| Shares | Weighted Average Grant Date Fair Value
Unvested restricted stock units at January 1, 2020 | 775,635 |  | $ | 1.47 |
Granted | — |  | — |
Forfeited | (25,000 | ) | 0.97 |
Vested | (54,995 | ) | 1.49 |
Unvested restricted stock units at March 31, 2020 | 695,640 |  | $ | 1.48 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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