Business Segment and Geographic Disclosures (Tables)

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Information about reporting segment net sales and gross margin are provided below:

Three months ended September 30, 2014	Air Pollution Control Segment			FUEL CHEM Segment			Other			Total
Revenues from external customers	$	11,140		$	10,342		$	—		$	21,482
Cost of sales	(6,621		)	(4,961		)	—			(11,582		)
Gross margin	4,519			5,381			—			9,900
Selling, general and administrative	—			—			(8,080		)	(8,080		)
Research and development	—			—			(379		)	(379		)
Operating income (loss)	$	4,519		$	5,381		$	(8,459	)	$	1,441

Three months ended September 30, 2013	Air Pollution Control Segment			FUEL CHEM Segment			Other			Total
Revenues from external customers	$	23,420		$	10,135		$	—		$	33,555
Cost of sales	(13,718		)	(4,737		)	—			(18,455		)
Gross margin	9,702			5,398			—			15,100
Selling, general and administrative	—			—			(9,304		)	(9,304		)
Research and development	—			—			(461		)	(461		)
Operating income (loss)	$	9,702		$	5,398		$	(9,765	)	$	5,335

Nine months ended September 30, 2014	Air Pollution Control Segment			FUEL CHEM Segment			Other			Total
Revenues from external customers	$	33,178		$	27,155		$	—		$	60,333
Cost of sales	(21,339		)	(12,730		)	—			(34,069		)
Gross margin	11,839			14,425			—			26,264
Selling, general and administrative	—			—			(25,783		)	(25,783		)
Research and development	—			—			(848		)	(848		)
Operating income (loss)	$	11,839		$	14,425		$	(26,631	)	$	(367	)

Nine months ended September 30, 2013	Air Pollution Control Segment			FUEL CHEM Segment			Other			Total
Revenues from external customers	$	56,606		$	28,525		$	—		$	85,131
Cost of sales	(35,384		)	(13,350		)	—			(48,734		)
Gross margin	21,222			15,175			—			36,397
Selling, general and administrative	—			—			(27,069		)	(27,069		)
Research and development	—			—			(1,824		)	(1,824		)
Operating income (loss)	$	21,222		$	15,175		$	(28,893	)	$	7,504

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area

Information concerning Fuel Tech’s operations by geographic area is provided below. Revenues are attributed to countries based on the location of the customer. Assets are those directly associated with operations of the geographic area.

	Three Months Ended   September 30,				Nine Months Ended   September 30,
	2014		2013		2014		2013
Revenues:
United States	$	10,690	$	20,685	$	33,653	$	50,795
Foreign	10,792		12,870		26,680		34,336
	$	21,482	$	33,555	$	60,333	$	85,131

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country

	September 30, 2014		December 31, 2013
Assets:
United States	$	81,958	$	83,464
Foreign	27,984		26,594
	$	109,942	$	110,058