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Business Segment and Geographic Financial Data (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2016
 
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Fuel Conversion Segment
 
Other
 
Total
Revenues from external customers
 
$
6,042


$
6,554


$
—


$
—


$
12,596

Cost of sales
 
(4,233
)

(3,048
)

—


—


(7,281
)
Gross margin
 
1,809


3,506


—


—


5,315

Selling, general and administrative
 
—


—


—


(5,789
)

(5,789
)
Restructuring charge

(373
)

(735
)

—


—


(1,108
)
Research and development
 
—


—


(630
)

(672
)

(1,302
)
Operating income (loss)
 
$
1,436


$
2,771


$
(630
)

$
(6,461
)

$
(2,884
)
 
Three months ended September 30, 2015
 
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Fuel Conversion Segment
 
Other
 
Total
Revenues from external customers
 
$
13,078


$
8,599


$
—


$
—


$
21,677

Cost of sales
 
(10,021
)

(3,808
)

—


—


(13,829
)
Gross margin
 
3,057


4,791


—


—


7,848

Selling, general and administrative
 
—


—


—


(7,122
)

(7,122
)
Restructuring charge

—


—


—


—


—

Research and development
 
—


—


(1,111
)

(410
)

(1,521
)
Operating income (loss)
 
$
3,057


$
4,791


$
(1,111
)

$
(7,532
)

$
(795
)
Nine months ended September 30, 2016
 
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Fuel Conversion Segment
 
Other
 
Total
Revenues from external customers
 
$
29,063

 
$
16,530

 
$
—

 
$
—

 
$
45,593

Cost of sales
 
(20,704
)
 
(7,946
)
 
—

 
—

 
(28,650
)
Gross margin
 
8,359

 
8,584

 
—

 
—

 
16,943

Selling, general and administrative
 
—

 
—

 
—

 
(19,711
)
 
(19,711
)
Restructuring charge

(537
)

(888
)

—


—


(1,425
)
Research and development
 
—

 
—

 
(2,144
)
 
(1,438
)
 
(3,582
)
Operating income (loss)
 
$
7,822

 
$
7,696

 
$
(2,144
)
 
$
(21,149
)
 
$
(7,775
)
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 
 September 30,

Nine Months Ended 
 September 30,
 
2016

2015

2016

2015
Revenues:







United States
$
9,838


$
13,665


$
36,523


$
38,141

Foreign
2,758


8,012


9,070


17,322


$
12,596


$
21,677


$
45,593


$
55,463
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country
 
 
September 30,
2016
 
December 31,
2015
Assets:
 
 
 
 
United States
 
$
42,938

 
$
47,437

Foreign
 
21,893

 
28,574

 
 
$
64,831

 
$
76,011