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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2020 and 2019 were as follows:
 
Three Months Ended 
 June 30,
Six Months Ended June 30,
 
2020
2019
2020
2019
Stock options and restricted stock units, net of forfeited
$
69

$
123

$
150

$
219

Tax benefit of stock-based compensation expense
—

—

—

—

After-tax effect of stock-based compensation
$
69

$
123

$
150

$
219
Schedule of Stock Option Activity
Stock option activity for Fuel Tech’s Incentive Plans for the six months ended June 30, 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
(40,000
)
5.50

 
 
Outstanding on June 30, 2020
707,500

$
3.21

4.48
$
—

Exercisable on June 30, 2020
707,500

$
3.21

4.48
$
—
Schedule of Nonvested Restricted Stock Units Activity
A summary of restricted stock unit activity for the six months ended June 30, 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
(120,630
)
1.57

Unvested restricted stock units at June 30, 2020
630,005

$
1.47