Stock-Based Compensation (Tables)

3 Months Ended

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