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Business Segment and Geographic Financial Data (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Information about reporting segment net sales and gross margin are provided below:
Three months ended September 30, 2017
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
$
8,799

 
$
4,749

 
$
—

 
$
13,548

Cost of sales
(6,184
)
 
(2,314
)
 
—

 
(8,498
)
Gross margin
2,615

 
2,435

 
—

 
5,050

Selling, general and administrative
—

 
—

 
(4,968
)
 
(4,968
)
Restructuring charge
—

 
—

 
—

 
—

Research and development
—

 
—

 
(216
)
 
(216
)
Building Impairment
—

 
—

 
—

 
—

Operating income (loss)
$
2,615

 
$
2,435

 
$
(5,184
)
 
$
(134
)
 
Three months ended September 30, 2016
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Revenues from external customers
$
6,042

 
$
6,554

 
$
—

 
$
12,596

Cost of sales
(4,233
)
 
(3,048
)
 
—

 
(7,281
)
Gross margin
1,809

 
3,506

 
—

 
5,315

Selling, general and administrative
—

 
—

 
(5,789
)
 
(5,789
)
Restructuring charge
(373
)
 
(735
)
 
—

 
(1,108
)
Research and development
—

 
—

 
(672
)
 
(672
)
Operating income (loss)
$
1,436

 
$
2,771

 
$
(6,461
)
 
$
(2,254
)

Nine months ended September 30, 2017
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Net Sales from external customers
$
18,346

 
$
13,434

 
$
—

 
$
31,780

Cost of sales
(12,787
)
 
(6,596
)
 
—

 
(19,383
)
Gross margin
5,559

 
6,838

 
—

 
12,397

Selling, general and administrative
—

 
—

 
(16,045
)
 
(16,045
)
Restructuring charge
(58
)
 
(61
)
 
—

 
(119
)
Research and development
—

 
—

 
(780
)
 
(780
)
Building Impairment
—

 
—

 
(2,965
)
 
(2,965
)
Operating income (loss)
$
5,501

 
$
6,777

 
$
(19,790
)
 
$
(7,512
)

Nine months ended September 30, 2016
Air Pollution
Control Segment
 
FUEL CHEM
Segment
 
Other
 
Total
Net Sales from external customers
$
29,063

 
$
16,530

 
$
—

 
$
45,593

Cost of sales
(20,704
)
 
(7,946
)
 
—

 
(28,650
)
Gross margin
8,359

 
8,584

 
—

 
16,943

Selling, general and administrative
—

 
—

 
(19,711
)
 
(19,711
)
Restructuring charge
(537
)
 
(888
)
 
—

 
(1,425
)
Research and development
—

 
—

 
(1,438
)
 
(1,438
)
Operating income (loss)
$
7,822

 
$
7,696

 
$
(21,149
)
 
$
(5,631
)
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 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
Revenues:

 

 

 

United States
$
8,888

 
$
9,838

 
$
21,537

 
$
36,523

Foreign
4,660

 
2,758

 
10,243

 
9,070


$
13,548

 
$
12,596

 
$
31,780

 
$
45,593
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country
 
September 30,
2017
 
December 31,
2016
Assets:
 
 
 
United States
$
28,590

 
$
37,684

Foreign
21,430

 
20,104

 
$
50,020

 
$
57,788