Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

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 and nine months ended September 30, 2017 and 2016 were as follows:

	Three Months Ended   September 30,				Nine Months Ended   September 30,
	2017		2016		2017		2016
Stock options and restricted stock units, net of forfeited	$	51	$	479	$	1,207	$	1,520
Tax benefit of stock-based compensation expense	—		—		—		—
After-tax effect of stock-based compensation (1)	$	51	$	479	$	1,207	$	1,520

(1) The decrease in stock-based compensation expense is due to the accelerated vesting of outstanding remaining restricted stock units approved by the Company's Board of Directors on June 28, 2017 and no stock-based compensation grants awarded during 2017.

Schedule of Stock Option Activity

Stock option activity for Fuel Tech’s Incentive Plans for the nine months ended September 30, 2017 was as follows:

	Number of Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding on January 1, 2017	1,039,750		$	8.39
Granted	—		—
Exercised	—		—
Expired or forfeited	(90,000	)	19.03
Outstanding on September 30, 2017	949,750		$	7.38	4.11	$	—
Exercisable on September 30, 2017	949,750		$	7.38	4.11	$	—

Schedule of Nonvested Restricted Stock Units Activity

A summary of restricted stock unit activity for the nine months ended September 30, 2017 is as follows:

	Shares		Weighted Average Grant Date Fair Value
Unvested restricted stock units at January 1, 2017	1,463,796		$	2.82
Granted	—		—
Forfeited	(213,001	)	2.99
Vested	(981,633	)	2.85
Unvested restricted stock units at September 30, 2017	269,162		$	2.57