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Business Segment and Geographic Financial Data (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2019
Air Pollution
Control Segment
FUEL CHEM
Segment
Other
Total
Revenues from external customers
$
5,789

$
4,366

$
—

$
10,155

Cost of sales
(3,889
)
(2,252
)
—

(6,141
)
Gross margin
1,900

2,114

—

4,014

Selling, general and administrative
—

—

(4,458
)
(4,458
)
Restructuring charge
(595
)
—

—

(595
)
Research and development
—

—

(266
)
(266
)
Operating income (loss) from continuing operations
$
1,305

$
2,114

$
(4,724
)
$
(1,305
)
 `
Three months ended March 31, 2018
Air Pollution
Control Segment
FUEL CHEM
Segment
Other
Total
Revenues from external customers
$
8,583

$
4,208

$
—

$
12,791

Cost of sales
(5,597
)
(2,169
)
—

(7,766
)
Gross margin
2,986

2,039

—

5,025

Selling, general and administrative
—

—

(4,921
)
(4,921
)
Research and development
—

—

(288
)
(288
)
Operating income (loss) from continuing operations
$
2,986

$
2,039

$
(5,209
)
$
(184
)
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 
 March 31,
 
2019
2018
Revenues:


United States
$
8,815

$
10,242

Foreign
1,340

2,549


$
10,155

$
12,791
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country
 
March 31,
2019
December 31,
2018
Assets:


United States
$
34,141

$
36,784

Foreign
13,104

14,935


$
47,245

$
51,719