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Business Segment and Geographic Financial Data (Tables)
 9 Months Ended
Sep. 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 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

 
Three months ended September 30, 2017
Air Pollution
Control Segment
FUEL CHEM
Segment
Other
Total
Revenues from external customers
$
8,799

$
4,749

$
—

$
13,548

Cost of sales
(6,184
)
(2,314
)
—

(8,498
)
Gross margin
2,615

2,435

—

5,050

Selling, general and administrative
—

—

(4,968
)
(4,968
)
Research and development
—

—

(216
)
(216
)
Operating income (loss) from continuing operations
$
2,615

$
2,435

$
(5,184
)
$
(134
)

Nine Months Ended September 30, 2018
Air Pollution
Control Segment
FUEL CHEM
Segment
Other
Total
Revenues from external customers
$
27,872

$
12,836

$
—

$
40,708

Cost of sales
(20,040
)
(6,505
)
—

(26,545
)
Gross margin
7,832

6,331

—

14,163

Selling, general and administrative
—

—

(13,789
)
(13,789
)
Research and development
—

—

(814
)
(814
)
Intangible assets abandonment
—

—

(317
)
(317
)
Operating income (loss) from continuing operations
$
7,832

$
6,331

$
(14,920
)
$
(757
)

Nine Months Ended September 30, 2017
Air Pollution
Control Segment
FUEL CHEM
Segment
Other
Total
Revenues from external customers
$
18,346

$
13,434

$
—

$
31,780

Cost of sales
(12,787
)
(6,596
)
—

(19,383
)
Gross margin
5,559

6,838

—

12,397

Selling, general and administrative
—

—

(16,045
)
(16,045
)
Restructuring charge
(58
)
(61
)
—

(119
)
Research and development
—

—

(780
)
(780
)
Building impairment
—

—

(2,965
)
(2,965
)
Operating income (loss) from continuing operations
$
5,501

$
6,777

$
(19,790
)
$
(7,512
)
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,
 
2018
2017
2018
2017
Revenues:




United States
$
11,629

$
8,888

$
30,701

$
21,537

Foreign
4,441

4,660

10,007

10,243


$
16,070

$
13,548

$
40,708

$
31,780
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country
 
September 30,
2018
December 31,
2017
Assets:
 
 
United States
$
34,942

$
29,945

Foreign
15,738

20,539

 
$
50,680

$
50,484