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Business Segment, Geographic and Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
The following table presents our revenues and net loss in China for the years ended December 31, 2018, 2017 and 2016:
 
 
2018
 
2017
 
2016
Total revenues
 
$
3,006

 
$
8,034

 
$
5,087

Net loss
 
(1,868
)
 
(1,343
)
 
(2,300
)
The following table presents net assets in China for the years ended December 31, 2018, 2017 and 2016:
 
 
2018
 
2017
 
2016
Total assets
 
$
8,546

 
$
13,005

 
$
13,474

Total liabilities
 
2,953

 
5,245

 
5,306

Total net assets
 
5,593

 
7,760

 
8,168

Information about reporting segment net sales and gross margin from continuing operations are provided below:
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 impairment
 
—


—


(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
)
 
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
)
 
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,
 
2018
 
2017
 
2016
Revenues:
 
 
 
 
 
 
United States
 
$
43,887

 
$
29,510

 
$
42,545

Foreign
 
12,648

 
15,656

 
12,616

 
 
$
56,535

 
$
45,166

 
$
55,161


As of December 31,
 
2018
 
2017
Assets:
 
 
 
 
United States
 
$
36,784

 
$
29,945

Foreign
 
14,935

 
20,539

 
 
$
51,719

 
$
50,484