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Business Segment and Geographic Financial Data (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Information about reporting segment net sales and gross margin from continuing operations are provided below:
Three months ended June 30, 2018
Air Pollution
Control Segment

FUEL CHEM
Segment

Other

Total
Revenues from external customers
$
8,407


$
3,440


$
—


$
11,847

Cost of sales
(6,328
)

(1,797
)

—


(8,125
)
Gross margin
2,079


1,643


—


3,722

Selling, general and administrative
—


—


(4,763
)

(4,763
)
Research and development
—


—


(261
)

(261
)
Intangible assets abandonment
—


—


(317
)

(317
)
Operating income (loss) from continuing operations
$
2,079


$
1,643


$
(5,341
)

$
(1,619
)
 
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) from continuing operations
$
1,384


$
2,183


$
(9,168
)

$
(5,601
)

Six Months Ended June 30, 2018
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
$
16,990

 
$
7,648

 
$
—

 
$
24,638

Cost of sales
(11,924
)
 
(3,967
)
 
—

 
(15,891
)
Gross margin
5,066

 
3,681

 
—

 
8,747

Selling, general and administrative
—

 
—

 
(9,684
)
 
(9,684
)
Research and development
—

 
—

 
(549
)
 
(549
)
Intangible assets abandonment
—

 
—

 
(317
)
 
(317
)
Operating income (loss) from continuing operations
$
5,066

 
$
3,681

 
$
(10,550
)
 
$
(1,803
)

Six Months Ended June 30, 2017
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues 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) from continuing operations
$
2,886

 
$
4,342

 
$
(14,606
)
 
$
(7,378
)
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,
 
2018
 
2017
 
2018
 
2017
Revenues:

 

 

 

United States
$
8,830

 
$
5,915

 
$
19,072

 
$
12,649

Foreign
3,017

 
3,826

 
5,566

 
5,583


$
11,847

 
$
9,741

 
$
24,638

 
$
18,232
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country
 
June 30,
2018
 
December 31,
2017
Assets:
 
 
 
United States
$
29,593

 
$
29,945

Foreign
17,364

 
20,539

 
$
46,957

 
$
50,484