Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

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 months ended March 31, 2019 and 2018 were as follows:

	Three Months Ended   March 31,
	2019		2018
Stock options and restricted stock units, net of forfeited	$	96	$	(59	)
Tax benefit of stock-based compensation expense	—		—
After-tax effect of stock-based compensation	$	96	$	(59	)

Schedule of Stock Option Activity

Stock option activity for Fuel Tech’s Incentive Plans for the three months ended March 31, 2019 was as follows:

	Number of Options	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding on January 1, 2019	932,500	$	4.68
Granted	—	—
Exercised	—	—
Expired or forfeited	—	—
Outstanding on March 31, 2019	932,500	$	4.68	4.42	$	131
Exercisable on March 31, 2019	932,500	$	4.68	4.42	$	131

Schedule of Nonvested Restricted Stock Units Activity

A summary of restricted stock unit activity for the three months ended March 31, 2019 is as follows:

	Shares		Weighted Average Grant Date Fair Value
Unvested restricted stock units at January 1, 2019	1,110,277		$	1.21
Granted	165,000		1.49
Forfeited	—		—
Vested	(17,777	)	1.27
Unvested restricted stock units at March 31, 2019	1,257,500		$	—