Business Segment and Geographic Financial Data (Tables)

3 Months Ended

Mar. 31, 2017

Schedule of Segment Reporting Information, by Segment

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



Three months ended March 31, 2017	Air Pollution Control Segment			FUEL CHEM Segment			Fuel Conversion Segment			Other			Total
Revenues from external customers	$	4,002		$	4,489		$	—		$	—		$	8,491
Cost of sales	(2,500		)	(2,269		)	—			—			(4,769		)
Gross margin	1,502			2,220			—			—			3,722
Selling, general and administrative	—			—			—			(5,154		)	(5,154		)
Restructuring charge	—			(61		)	—			—			(61		)
Research and development	—			—			(730		)	(284		)	(1,014		)
Operating income (loss)	$	1,502		$	2,159		$	(730	)	$	(5,438	)	$	(2,507	)



Three months ended March 31, 2016	Air Pollution Control Segment			FUEL CHEM Segment			Fuel Conversion Segment			Other			Total
Revenues from external customers	$	12,990		$	4,832		$	—		$	—		$	17,822
Cost of sales	(9,319		)	(2,455		)	—			—			(11,774		)
Gross margin	3,671			2,377			—			—			6,048
Selling, general and administrative	—			—			—			(7,162		)	(7,162		)
Restructuring charge	(195		)	(122		)	—						(317		)
Research and development	—			—			(687		)	(471		)	(1,158		)
Operating income (loss)	$	3,476		$	2,255		$	(687	)	$	(7,633	)	$	(2,589	)

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

Information concerning our 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 March 31,
	2017		2016
Revenues:
United States	$	6,734	$	14,430
Foreign	1,757		3,392
	$	8,491	$	17,822

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



	March 31, 2017		December 31, 2016
Assets:
United States	$	34,483	$	37,684
Foreign	17,671		20,104
	$	52,154	$	57,788