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Business Segment and Geographic Financial Data (Tables)
 3 Months Ended
Mar. 31, 2016
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 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
 
—


—


—


(7,479
)

(7,479
)
Research and development
 
—


—


(687
)

(471
)

(1,158
)
Operating income (loss)
 
$
3,671


$
2,377


$
(687
)

$
(7,950
)

$
(2,589
)
 
Three months ended March 31, 2015
 
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Fuel Conversion Segment
 
Other
 
Total
Revenues from external customers
 
$
6,857


$
8,246


$
—


$
—


$
15,103

Cost of sales
 
(4,321
)

(4,116
)

—


—


(8,437
)
Gross margin
 
2,536


4,130


—


—


6,666

Selling, general and administrative
 
—


—


—


(8,203
)

(8,203
)
Research and development
 
—


—


(472
)

(400
)

(872
)
Operating income (loss)
 
$
2,536


$
4,130


$
(472
)

$
(8,603
)

$
(2,409
)
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,
 
2016
 
2015
Revenues:
 
 
 
United States
$
14,430

 
$
12,575

Foreign
3,392

 
2,528

 
$
17,822

 
$
15,103
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country
 
 
March 31,
2016
 
December 31,
2015
Assets:
 
 
 
 
United States
 
$
48,004

 
$
47,437

Foreign
 
24,775

 
28,574

 
 
$
72,779

 
$
76,011