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Revenue - Revenues Disaggregated by Product Technology (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Total Revenues | $ 3,778 | $ 10,155
Air Pollution Control |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 1,196 | 5,789
Air Pollution Control | Technology solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 729 | 4,741
Air Pollution Control | Spare parts |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 199 | 149
Air Pollution Control | Ancillary revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 268 | 899
FUEL CHEM |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 2,582 | 4,366
FUEL CHEM | Technology solutions |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | $ 2,582 | $ 4,366

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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