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Business Segment, Geographic and Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 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:
For the year ended December 31, 2019
 
Air Pollution 
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
 
$
14,082


$
16,385


$
—


$
30,467

Cost of sales
 
(11,256
)

(8,381
)

—


(19,637
)
Gross margin
 
2,826


8,004


—


10,830

Selling, general and administrative
 
—


—


(17,191
)

(17,191
)
Restructuring charge
 
(625
)
 
—

 
—

 
(625
)
Research and development
 
—


—


(1,127
)

(1,127
)
Intangible assets abandonment
 
—


—


(127
)

(127
)
Operating income (loss) from continuing operations
 
$
2,201


$
8,004


$
(18,445
)

$
(8,240
)
 
For the year ended December 31, 2018
 
Air Pollution 
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
 
$
38,417

 
$
18,118

 
$
—

 
$
56,535

Cost of sales
 
(27,382
)
 
(9,089
)
 
—

 
(36,471
)
Gross margin
 
11,035

 
9,029

 
—

 
20,064

Selling, general and administrative
 
—

 
—

 
(18,564
)
 
(18,564
)
Research and development
 
—

 
—

 
(1,073
)
 
(1,073
)
Intangible assets abandonment
 
—

 
—

 
(317
)
 
(317
)
Operating income (loss) from continuing operations
 
$
11,035

 
$
9,029

 
$
(19,954
)
 
$
110

 
For the year ended December 31, 2017
 
Air Pollution 
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
 
$
27,808

 
$
17,358

 
$
—

 
$
45,166

Cost of sales
 
(18,478
)
 
(8,666
)
 
—

 
(27,144
)
Gross margin
 
9,330

 
8,692

 
—

 
18,022

Selling, general and administrative
 
—

 
—

 
(20,933
)
 
(20,933
)
Restructuring charge
 
(58
)
 
(61
)
 
—

 
(119
)
Research and development
 
—

 
—

 
(1,070
)
 
(1,070
)
Building impairment
 
—

 
—

 
(2,965
)
 
(2,965
)
Operating income (loss) from continuing operations
 
$
9,272

 
$
8,631

 
$
(24,968
)
 
$
(7,065
)
 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area
Assets are those directly associated with operations of the geographic area.
 
For the years ended December 31,
 
2019
 
2018
 
2017
Revenues:
 
 
 
 
 
 
United States
 
$
25,882

 
$
43,887

 
$
29,510

Foreign
 
4,585

 
12,648

 
15,656

 
 
$
30,467

 
$
56,535

 
$
45,166


As of December 31,
 
2019
 
2018
Assets:
 
 
 
 
United States
 
$
23,460

 
$
36,784

Foreign
 
8,764

 
14,935

 
 
$
32,224

 
$
51,719