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Revenue (Tables) | 3 Months Ended
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Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents the timing of our revenue recognition:
| Three Months Ended March 31,
| 2019 | 2018
Products transferred at a point in time | 5,414 |  | 5,069 |
Products and services transferred over time | 4,741 |  | 7,722 |
Total Revenues | 10,155 |  | 12,791 |
The following table presents our revenues disaggregated by product technology:
| Three Months Ended March 31,
| 2019 | 2018
Air Pollution Control |  |
Technology solutions | $ | 4,741 |  | $ | 7,722 |
Spare parts | 149 |  | 300 |
Ancillary revenue | 899 |  | 561 |
Total Air Pollution Control Technology revenues | 5,789 |  | 8,583 |
FUEL CHEM |  |
FUEL CHEM technology solutions | 4,366 |  | 4,208 |
Total Revenues | $ | 10,155 |  | $ | 12,791 |
Revenue Disaggregated by Geography | The following table presents our revenues disaggregated by geography, based on the billing addresses of our customers:
| Three Months Ended March 31,
| 2019 | 2018
United States | $ | 8,815 |  | $ | 10,242 |
Foreign Revenues |  |
South America | 175 |  | 335 |
Europe | 617 |  | 1,454 |
Asia | 548 |  | 760 |
Total Foreign Revenues | 1,340 |  | 2,549 |
Total Revenues | $ | 10,155 |  | $ | 12,791 |

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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