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Business Segment and Geographic Financial Data (Tables)
 9 Months Ended
Sep. 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 September 30, 2019
Air Pollution
Control Segment
FUEL CHEM
Segment
Other
Total
Revenues from external customers
$
1,816

$
4,636

$
—

$
6,452

Cost of sales
(1,197
)
(2,366
)
—

(3,563
)
Gross margin
619

2,270

—

2,889

Selling, general and administrative
—

—

(3,822
)
(3,822
)
Research and development
—

—

(352
)
(352
)
Intangible assets abandonment
—

—

(76
)
(76
)
Operating income (loss) from continuing operations
$
619

$
2,270

$
(4,250
)
$
(1,361
)
 `
Three months ended September 30, 2018
Air Pollution
Control Segment
FUEL CHEM
Segment
Other
Total
Revenues from external customers
$
10,882

$
5,188

$
—

$
16,070

Cost of sales
(8,116
)
(2,538
)
—

(10,654
)
Gross margin
2,766

2,650

—

5,416

Selling, general and administrative
—

—

(4,105
)
(4,105
)
Research and development
—

—

(265
)
(265
)
Operating income (loss) from continuing operations
$
2,766

$
2,650

$
(4,370
)
$
1,046
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,
 
2019
2018
2019
2018
Revenues:




United States
5,727

11,629

22,104

30,701

Foreign
725

4,441

3,451

10,007


6,452

16,070

25,555

40,708
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country
 
September 30,
2019
December 31,
2018
Assets:


United States
$
29,437

$
36,784

Foreign
8,442

14,935


$
37,879

$
51,719