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Business Segment, Geographic and Quarterly Financial Data - Reporting Segment Net Sales and Gross Margin (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenues from external customers | $ 9,568,000 | $ 12,596,000 | $ 15,175,000 | $ 17,822,000 | $ 18,201,000 | $ 21,677,000 | $ 18,683,000 | $ 15,103,000 | $ 55,161,000 | $ 73,664,000 | $ 79,017,000
Cost of sales | $ (7,717,000) | $ (7,281,000) | $ (9,595,000) | $ (11,774,000) | $ (11,294,000) | $ (13,829,000) | $ (11,547,000) | $ (8,437,000) | (36,367,000) | (45,107,000) | (43,889,000)
Gross margin |  |  |  |  |  |  |  |  | 18,794,000 | 28,557,000 | 35,128,000
Selling, general and administrative |  |  |  |  |  |  |  |  | (25,564,000) | (30,897,000) | (35,432,000)
Restructuring charge |  |  |  |  |  |  |  |  | (1,428,000) | (219,000) | 0
Research and development |  |  |  |  |  |  |  |  | (4,552,000) | (4,273,000) | (1,459,000)
Goodwill and intangible assets impairment |  |  |  |  |  |  |  |  | (2,074,000) | (1,425,000) | (23,400,000)
Operating (loss) |  |  |  |  |  |  |  |  | (14,824,000) | (8,257,000) | (25,163,000)
Air Pollution Control Segment |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 34,052,000 | 43,485,000 | 42,031,000
Cost of sales |  |  |  |  |  |  |  |  | (25,370,000) | (30,612,000) | (26,586,000)
Gross margin |  |  |  |  |  |  |  |  | 8,682,000 | 12,873,000 | 15,445,000
Selling, general and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Restructuring charge |  |  |  |  |  |  |  |  | (537,000) | (149,000) | 0
Research and development |  |  |  |  |  |  |  |  | 0 | 0 | 0
Goodwill and intangible assets impairment |  |  |  |  |  |  |  |  | 0 | (1,425,000) | (23,400,000)
Operating (loss) |  |  |  |  |  |  |  |  | 8,145,000 | 11,299,000 | (7,955,000)
FUEL CHEM Segment |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 21,109,000 | 30,179,000 | 36,986,000
Cost of sales |  |  |  |  |  |  |  |  | (10,997,000) | (14,495,000) | (17,303,000)
Gross margin |  |  |  |  |  |  |  |  | 10,112,000 | 15,684,000 | 19,683,000
Selling, general and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Restructuring charge |  |  |  |  |  |  |  |  | (891,000) | (70,000) | 0
Research and development |  |  |  |  |  |  |  |  | 0 | 0 | 0
Goodwill and intangible assets impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating (loss) |  |  |  |  |  |  |  |  | 9,221,000 | 15,614,000 | 19,683,000
Fuel Conversion Segment |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross margin |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Restructuring charge |  |  |  |  |  |  |  |  | 0 | 0 | 0
Research and development |  |  |  |  |  |  |  |  | (2,800,000) | (2,826,000) | (277,000)
Goodwill and intangible assets impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating (loss) |  |  |  |  |  |  |  |  | (2,800,000) | (2,826,000) | (277,000)
Other |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross margin |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative |  |  |  |  |  |  |  |  | (25,564,000) | (30,897,000) | (35,432,000)
Restructuring charge |  |  |  |  |  |  |  |  | 0 | 0 | 0
Research and development |  |  |  |  |  |  |  |  | (1,752,000) | (1,447,000) | (1,182,000)
Goodwill and intangible assets impairment |  |  |  |  |  |  |  |  | (2,074,000) | 0 | 0
Operating (loss) |  |  |  |  |  |  |  |  | $ (29,390,000) | $ (32,344,000) | $ (36,614,000)

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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