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Business Segment, Geographic and Quarterly Financial Data (Tables) | 12 Months Ended
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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 | )

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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