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

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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=68060357&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=68060357&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=68060357&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=68060357&loc=d3e8736-108599 + Details
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