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Business Segment and Geographic Financial Data (Tables)
 6 Months Ended
Jun. 30, 2017
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 June 30, 2017
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
$
5,545

 
$
4,196

 
$
—

 
$
9,741

Cost of sales
(4,103
)
 
(2,013
)
 
—

 
(6,116
)
Gross margin
1,442

 
2,183

 
—

 
3,625

Selling, general and administrative
—

 
—

 
(5,923
)
 
(5,923
)
Restructuring charge
(58
)
 
—

 
—

 
(58
)
Research and development
—

 
—

 
(280
)
 
(280
)
Building Impairment
—

 
—

 
(2,965
)
 
(2,965
)
Operating income (loss)
$
1,384

 
$
2,183

 
$
(9,168
)
 
$
(5,601
)
 
Three months ended June 30, 2016
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
$
10,031

 
$
5,144

 
$
—

 
$
15,175

Cost of sales
(7,152
)
 
(2,443
)
 
—

 
(9,595
)
Gross margin
2,879

 
2,701

 
—

 
5,580

Selling, general and administrative
—

 
—

 
(6,760
)
 
(6,760
)
Restructuring charge
—

 
—

 
—

 
—

Research and development
—

 
—

 
(295
)
 
(295
)
Operating income (loss)
$
2,879

 
$
2,701

 
$
(7,055
)
 
$
(1,475
)

Six months ended June 30, 2017
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Net Sales from external customers
$
9,547

 
$
8,685

 
$
—

 
$
18,232

Cost of sales
(6,603
)
 
(4,282
)
 
—

 
(10,885
)
Gross margin
2,944

 
4,403

 
—

 
7,347

Selling, general and administrative
—

 
—

 
(11,077
)
 
(11,077
)
Restructuring charge
(58
)
 
(61
)
 
—

 
(119
)
Research and development
—

 
—

 
(564
)
 
(564
)
Building Impairment
—

 
—

 
(2,965
)
 
(2,965
)
Operating income (loss)
$
2,886

 
$
4,342

 
$
(14,606
)
 
$
(7,378
)

Six months ended June 30, 2016
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Net Sales from external customers
$
23,021

 
$
9,976

 
$
—

 
$
32,997

Cost of sales
(16,471
)
 
(4,898
)
 
—

 
(21,369
)
Gross margin
6,550

 
5,078

 
—

 
11,628

Selling, general and administrative
—

 
—

 
(13,922
)
 
(13,922
)
Restructuring charge
(164
)
 
(153
)
 
—

 
(317
)
Research and development
—

 
—

 
(766
)
 
(766
)
Operating income (loss)
$
6,386

 
$
4,925

 
$
(14,688
)
 
$
(3,377
)
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 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Revenues:

 

 

 

United States
$
5,915

 
$
12,255

 
$
12,649

 
$
26,685

Foreign
3,826

 
2,920

 
5,583

 
6,312


$
9,741

 
$
15,175

 
$
18,232

 
$
32,997
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country
 
June 30,
2017
 
December 31,
2016
Assets:
 
 
 
United States
$
29,619

 
$
37,684

Foreign
19,439

 
20,104

 
$
49,058

 
$
57,788