Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2019

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, 2019 and 2018 were as follows:

	Three Months Ended   June 30,				Six Months Ended   June 30,
	2019		2018		2019		2018
Stock options and restricted stock units, net of forfeited	$	123	$	97	$	219	$	38
Tax benefit of stock-based compensation expense	—		—		—		—
After-tax effect of stock-based compensation	$	123	$	97	$	219	$	38

Schedule of Stock Option Activity

Stock option activity for Fuel Tech’s Incentive Plans for the six months ended June 30, 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	(185,000	)	10.14
Outstanding on June 30, 2019	747,500		$	3.33	5.24	$	77
Exercisable on June 30, 2019	747,500		$	3.33	5.24	$	77

Schedule of Nonvested Restricted Stock Units Activity

A summary of restricted stock unit activity for the six months ended June 30, 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	228,135		1.52
Forfeited	—		—
Vested	(17,777	)	1.59
Unvested restricted stock units at June 30, 2019	1,320,635		$	1.26