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Business Segment and Geographic Financial Data - Reporting Segment Net Sales and Gross Margin (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | $ 11,847,000 | $ 9,741,000 | $ 24,638,000 | $ 18,232,000
Cost of sales | (8,125,000) | (6,116,000) | (15,891,000) | (10,885,000)
Gross margin | 3,722,000 | 3,625,000 | 8,747,000 | 7,347,000
Selling, general and administrative | (4,763,000) | (5,923,000) | (9,684,000) | (11,077,000)
Restructuring charge | 0 | (58,000) | 0 | (119,000)
Research and development | (261,000) | (280,000) | (549,000) | (564,000)
Intangible assets abandonment | (317,000) |  | (317,000) |
Building impairment |  | (2,965,000) |  | (2,965,000)
Operating loss from continuing operations | (1,619,000) | (5,601,000) | (1,803,000) | (7,378,000)
Air Pollution Control Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 8,407,000 | 5,545,000 | 16,990,000 | 9,547,000
Cost of sales | (6,328,000) | (4,103,000) | (11,924,000) | (6,603,000)
Gross margin | 2,079,000 | 1,442,000 | 5,066,000 | 2,944,000
Selling, general and administrative | 0 | 0 | 0 | 0
Restructuring charge |  | (58,000) |  | (58,000)
Research and development | 0 | 0 | 0 | 0
Operating loss from continuing operations | 2,079,000 | 1,384,000 | 5,066,000 | 2,886,000
FUEL CHEM Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 3,440,000 | 4,196,000 | 7,648,000 | 8,685,000
Cost of sales | (1,797,000) | (2,013,000) | (3,967,000) | (4,282,000)
Gross margin | 1,643,000 | 2,183,000 | 3,681,000 | 4,403,000
Selling, general and administrative | 0 | 0 | 0 | 0
Restructuring charge |  | 0 |  | (61,000)
Research and development | 0 | 0 | 0 | 0
Operating loss from continuing operations | 1,643,000 | 2,183,000 | 3,681,000 | 4,342,000
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Selling, general and administrative | (4,763,000) | (5,923,000) | (9,684,000) | (11,077,000)
Restructuring charge |  | 0 |  | 0
Research and development | (261,000) | (280,000) | (549,000) | (564,000)
Intangible assets abandonment | (317,000) |  | (317,000) |
Building impairment |  | (2,965,000) |  | (2,965,000)
Operating loss from continuing operations | $ (5,341,000) | $ (9,168,000) | $ (10,550,000) | $ (14,606,000)

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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