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Business Segment, Geographic and Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2016
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Information about reporting segment net sales and gross margin are provided below:
 
For the year ended December 31, 2016
 
Air Pollution 
Control Segment
 
FUEL CHEM
Segment
 
Fuel Conversion 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
 
—

 
—

 
(2,800
)
 
(1,752
)
 
(4,552
)
Goodwill and intangible assets impairment
 
—

 
—

 
—

 
(2,074
)
 
(2,074
)
Operating (loss) income
 
$
8,145

 
$
9,221

 
$
(2,800
)
 
$
(29,390
)
 
$
(14,824
)
 
For the year ended December 31, 2015
 
Air Pollution 
Control Segment
 
FUEL CHEM
Segment
 
Fuel Conversion 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
 
—

 
—

 
(2,826
)
 
(1,447
)
 
(4,273
)
Goodwill and intangible assets impairment
 
(1,425
)
 
—

 
—

 
—

 
(1,425
)
Operating (loss) income
 
$
11,299

 
$
15,614

 
$
(2,826
)
 
$
(32,344
)
 
$
(8,257
)
 
For the year ended December 31, 2014
 
Air Pollution 
Control Segment
 
FUEL CHEM
Segment
 
Fuel Conversion Segment
 
Other
 
Total
Revenues from external customers
 
$
42,031

 
$
36,986

 
$
—

 
$
—

 
$
79,017

Cost of sales
 
(26,586
)
 
(17,303
)
 
—

 
—

 
(43,889
)
Gross margin
 
15,445

 
19,683

 
—

 
—

 
35,128

Selling, general and administrative
 
—

 
—

 
—

 
(35,432
)
 
(35,432
)
Restructuring charge
 
—

 
—

 
—

 
—

 
—

Research and development
 
—

 
—

 
(277
)
 
(1,182
)
 
(1,459
)
Goodwill and intangible assets impairment
 
(23,400
)
 
—

 
—

 
—

 
(23,400
)
Operating (loss) income
 
$
(7,955
)
 
$
19,683

 
$
(277
)
 
$
(36,614
)
 
$
(25,163
)
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,
 
2016
 
2015
 
2014
Revenues:
 
 
 
 
 
 
United States
 
$
42,545

 
$
51,485

 
$
50,901

Foreign
 
12,616

 
22,179

 
28,116

 
 
$
55,161

 
$
73,664

 
$
79,017


As of December 31,
 
2016
 
2015
Assets:
 
 
 
 
United States
 
$
37,684

 
$
47,437

Foreign
 
20,104

 
28,574

 
 
$
57,788

 
$
76,011