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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Schedule of Cumulative Effect of Changes to Balance Sheet | The cumulative effect of the changes made to our January 1, 2018 consolidated balance sheet for the adoption of ASC 606 were as follows:
| Balance at December 31, 2017 |  | Adjustments Upon Adoption of ASC 606 |  | Balance at January 1, 2018
Liabilities |  |  |  |  |
Other accrued liabilities | 5,098 |  |  | (205 | ) |  | 4,893 |
Equity |  |  |  |  |
Accumulated deficit | (102,503 | ) |  | 205 |  |  | (102,298 | )
Disaggregation of Revenue | The following table presents the timing of our revenue recognition:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 (1) |  | 2018 |  | 2017 (1)
Products transferred at a point in time | 4,255 |  |  | 4,987 |  |  | 9,324 |  |  | 10,130 |
Products and services transferred over time | 7,592 |  |  | 4,754 |  |  | 15,314 |  |  | 8,102 |
Total Revenues | 11,847 |  |  | 9,741 |  |  | 24,638 |  |  | 18,232 |
(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method. The following table presents our revenues disaggregated by product technology:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 (1) |  | 2018 |  | 2017 (1)
Air Pollution Control |  |  |  |  |  |  |
Technology solutions | 7,592 |  |  | 4,754 |  |  | 15,314 |  |  | 8,102 |
Spare parts | 229 |  |  | 267 |  |  | 529 |  |  | 536 |
Ancillary revenue | 586 |  |  | 524 |  |  | 1,147 |  |  | 909 |
Total Air Pollution Control Technology revenues | 8,407 |  |  | 5,545 |  |  | 16,990 |  |  | 9,547 |
FUEL CHEM |  |  |  |  |  |  |
FUEL CHEM technology solutions | 3,440 |  |  | 4,196 |  |  | 7,648 |  |  | 8,685 |
Total Revenues | 11,847 |  |  | 9,741 |  |  | 24,638 |  |  | 18,232 |
(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.
Revenue Disaggregated by Geography | The following table presents our revenues disaggregated by geography, based on the billing addresses of our customers:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 (1) |  | 2018 |  | 2017 (1)
United States | 8,830 |  |  | 5,915 |  |  | 19,072 |  |  | 12,649 |
Foreign Revenues |  |  |  |  |  |  |
South America | 354 |  |  | — |  |  | 626 |  |  | 145 |
Europe | 1,562 |  |  | 1,143 |  |  | 3,028 |  |  | 1,981 |
Asia | 1,101 |  |  | 2,683 |  |  | 1,912 |  |  | 3,457 |
Total Foreign Revenues | 3,017 |  |  | 3,826 |  |  | 5,566 |  |  | 5,583 |
Total Revenues | 11,847 |  |  | 9,741 |  |  | 24,638 |  |  | 18,232 |
(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.

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