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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents the timing of our revenue recognition:
| Three Months Ended June 30, | Six Months Ended June 30,
| 2019 | 2018 | 2019 | 2018
Products transferred at a point in time | $ | 5,153 |  | $ | 4,255 |  | $ | 10,567 |  | $ | 9,324 |
Products and services transferred over time | 3,795 |  | 7,592 |  | 8,536 |  | 15,314 |
Total Revenues | $ | 8,948 |  | $ | 11,847 |  | $ | 19,103 |  | $ | 24,638 |
The following table presents our revenues disaggregated by product technology:
| Three Months Ended June 30, | Six Months Ended June 30,
| 2019 | 2018 | 2019 | 2018
Air Pollution Control |  |  |  |
Technology solutions | $ | 3,795 |  | $ | 7,592 |  | $ | 8,536 |  | $ | 15,314 |
Spare parts | 384 |  | 229 |  | 533 |  | 529 |
Ancillary revenue | 624 |  | 586 |  | 1,523 |  | 1,147 |
Total Air Pollution Control Technology revenues | 4,803 |  | 8,407 |  | 10,592 |  | 16,990 |
FUEL CHEM |  |  |  |
FUEL CHEM technology solutions | 4,145 |  | 3,440 |  | 8,511 |  | 7,648 |
Total Revenues | $ | 8,948 |  | $ | 11,847 |  | $ | 19,103 |  | $ | 24,638 |
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,
| 2019 | 2018 | 2019 | 2018
United States | $ | 7,562 |  | $ | 8,830 |  | $ | 16,377 |  | $ | 19,072 |
Foreign Revenues |  |  |  |
South America | 17 |  | 354 |  | 192 |  | 626 |
Europe | 668 |  | 1,562 |  | 1,285 |  | 3,028 |
Asia | 701 |  | 1,101 |  | 1,249 |  | 1,912 |
Total Foreign Revenues | 1,386 |  | 3,017 |  | 2,726 |  | 5,566 |
Total Revenues | $ | 8,948 |  | $ | 11,847 |  | $ | 19,103 |  | $ | 24,638 |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] | The components of accounts receivable are as follows:
| As of
| June 30, 2019 |  | December 31, 2018
Trade receivables | $ | 11,403 |  |  | $ | 14,261 |
Unbilled receivables | 2,338 |  |  | 5,540 |
Insurance proceeds receivable (Note 14) | 1,978 |  |  | — |
Other short-term receivables | 124 |  |  | 9 |
Allowance for doubtful accounts | (1,216 | ) |  | (1,411 | )
Total accounts receivable | $ | 14,627 |  |  | $ | 18,399 |

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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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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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