Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2018 and 2017 were as follows:

	Three Months Ended   March 31,
	2018			2017
Stock options and restricted stock units, net of forfeited	$	(59	)	$	(10	)
Tax benefit of stock-based compensation expense	—			—
After-tax effect of stock-based compensation	$	(59	)	$	(10	)

Schedule of Stock Option Activity

Stock option activity for Fuel Tech’s Incentive Plans for the three months ended March 31, 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	(45,250	)	12.74
Outstanding on March 31, 2018	1,071,500		$	6.07	4.75	$	41,360
Exercisable on March 31, 2018	1,071,500		$	6.07	4.75	$	41,360

Schedule of Nonvested Restricted Stock Units Activity

A summary of restricted stock unit activity for the three months ended March 31, 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	(66,665	)	1.59
Vested	(44,445	)	1.59
Unvested restricted stock units at March 31, 2018	1,248,052		$	1.25