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Business Segment and Geographic Financial Data (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019
Air Pollution
Control Segment
FUEL CHEM
Segment
Other
Total
Revenues from external customers
$
4,803

$
4,145

$
—

$
8,948

Cost of sales
(2,975
)
(2,075
)
—

(5,050
)
Gross margin
1,828

2,070

—

3,898

Selling, general and administrative
—

—

(4,455
)
(4,455
)
Restructuring charge
(30
)
—

—

(30
)
Research and development
—

—

(205
)
(205
)
Intangible assets abandonment
—

—

(51
)
(51
)
Operating income (loss) from continuing operations
$
1,798

$
2,070

$
(4,711
)
$
(843
)
 `
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
)
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,
 
2019
2018
2019
2018
Revenues:




United States
$
7,562

$
8,830

$
16,377

$
19,072

Foreign
1,386

3,017

2,726

5,566


$
8,948

$
11,847

$
19,103

$
24,638
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country
 
June 30,
2019
December 31,
2018
Assets:


United States
$
33,777

$
36,784

Foreign
10,204

14,935


$
43,981

$
51,719