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Business Segment, Geographic and Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2015
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, 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
 
—

 
—

 
—

 
(31,116
)
 
(31,116
)
Research and development
 
—

 
—

 
(2,826
)
 
(1,447
)
 
(4,273
)
Intangible assets impairment
 
(1,425
)
 
—

 
—

 
—

 
(1,425
)
Operating (loss) income
 
$
11,448

 
$
15,684

 
$
(2,826
)
 
$
(32,563
)
 
$
(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
)
Research and development
 
—

 
—

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

 
—

 
—

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

 
$
(277
)
 
$
(36,614
)
 
$
(25,163
)
 
For the year ended December 31, 2013
 
Air Pollution 
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
 
$
72,552

 
$
36,786

 
$
—

 
$
109,338

Cost of sales
 
(45,138
)
 
(17,383
)
 
—

 
(62,521
)
Gross margin
 
27,414

 
19,403

 
—

 
46,817

Selling, general and administrative
 
—

 
—

 
(36,375
)
 
(36,375
)
Research and development
 
—

 
—

 
(2,442
)
 
(2,442
)
Operating income
 
$
27,414

 
$
19,403

 
$
(38,817
)
 
$
8,000
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,
 
2015
 
2014
 
2013
Revenues:
 
 
 
 
 
 
United States
 
$
51,485

 
$
50,901

 
$
63,275

Foreign
 
22,179

 
28,116

 
46,063

 
 
$
73,664

 
$
79,017

 
$
109,338


As of December 31,
 
2015
 
2014
Assets:
 
 
 
 
United States
 
$
47,437

 
$
64,324

Foreign
 
28,574

 
27,147

 
 
$
76,011

 
$
91,471
Schedule of Quarterly Financial Information
Set forth below are the unaudited quarterly financial data for the fiscal years ended December 31, 2015 and 2014.
 
For the quarters ended
 
March 31
 
June 30
 
September 30
 
December 31
2015
 
 
 
 
 
 
 
 
Revenues
 
$
15,103

 
$
18,683

 
$
21,677

 
$
18,201

Cost of sales
 
8,437

 
11,547

 
13,829

 
11,294

Net (loss) income
 
(1,654
)
 
(1,371
)
 
(289
)
 
(9,066
)
Net (loss) income per common share:
 
 
 
 
 
 
 
 
Basic
 
$
(0.07
)
 
$
(0.06
)
 
$
(0.01
)
 
$
(0.39
)
Diluted
 
$
(0.07
)
 
$
(0.06
)
 
$
(0.01
)
 
$
(0.39
)
2014
 
 
 
 
 
 
 
 
Revenues
 
$
18,661

 
$
20,190

 
$
21,482

 
$
18,684

Cost of sales
 
10,810

 
11,677

 
11,582

 
9,820

Net (loss) income
 
(1,086
)
 
(720
)
 
1,192

 
(17,111
)
Net (loss) income per common share:
 
 
 
 
 
 
 
 
Basic
 
$
(0.05
)
 
$
(0.03
)
 
$
0.05

 
$
(0.75
)
Diluted
 
$
(0.05
)
 
$
(0.03
)
 
$
0.05

 
$
(0.75
)