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Business Segment, Geographic and Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2017
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, 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
)
 
For the year ended December 31, 2016
 
Air Pollution 
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
 
$
34,052

 
$
21,109

 
$
—

 
$
55,161

Cost of sales
 
(25,370
)
 
(10,997
)
 
—

 
(36,367
)
Gross margin
 
8,682

 
10,112

 
—

 
18,794

Selling, general and administrative
 
—

 
—

 
(25,564
)
 
(25,564
)
Restructuring charge
 
(537
)
 
(891
)
 
—

 
(1,428
)
Research and development
 
—

 
—

 
(1,752
)
 
(1,752
)
Intangible assets impairment
 
—

 
—

 
(2,074
)
 
(2,074
)
Operating income (loss) from continuing operations
 
$
8,145

 
$
9,221

 
$
(29,390
)
 
$
(12,024
)
 
For the year ended December 31, 2015
 
Air Pollution 
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
 
$
43,485

 
$
30,179

 
$
—

 
$
73,664

Cost of sales
 
(30,612
)
 
(14,495
)
 
—

 
(45,107
)
Gross margin
 
12,873

 
15,684

 
—

 
28,557

Selling, general and administrative
 
—

 
—

 
(30,897
)
 
(30,897
)
Restructuring charge
 
(149
)
 
(70
)
 
—

 
(219
)
Research and development
 
—

 
—

 
(1,447
)
 
(1,447
)
Intangible assets impairment
 
(1,425
)
 
—

 
—

 
(1,425
)
Operating income (loss) from continuing operations
 
$
11,299

 
$
15,614

 
$
(32,344
)
 
$
(5,431
)
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,
 
2017
 
2016
 
2015
Revenues:
 
 
 
 
 
 
United States
 
$
29,510

 
$
42,545

 
$
51,485

Foreign
 
15,656

 
12,616

 
22,179

 
 
$
45,166

 
$
55,161

 
$
73,664


As of December 31,
 
2017
 
2016
Assets:
 
 
 
 
United States
 
$
29,945

 
$
37,684

Foreign
 
20,539

 
20,104

 
 
$
50,484

 
$
57,788