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Revenue | 6 Months Ended
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Jun. 30, 2019
Revenue from Contract with Customer [Abstract] |
Revenue | Revenue The Company recognizes revenue when control of the promised goods or services is transferred to our customers, in amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. Fuel Tech’s sales of products to customers represent single performance obligations. The majority of our contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and, therefore, not distinct. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. Sales, value add, and other taxes we collect concurrent with revenue-producing activities are excluded from revenue. We generally expense sales commissions on a ratable basis when incurred because the amortization period would have been one year or less. These costs are recorded within selling, general and administrative expenses within the Condensed Consolidated Statements of Operations. FUEL CHEM Revenues from the sale of chemical products are recognized when control transfers to customer upon shipment or delivery of the product based on the applicable shipping terms. We generally recognize revenue for these arrangements at a point in time based on our evaluation of when the customer obtains control of the promised goods or services. Air Pollution Control Technology Fuel Tech’s APC contracts are typically six to eighteen months in length. A typical contract will have three or four critical operational measurements that, when achieved, serve as the basis for us to invoice the customer via progress billings. At a minimum, these measurements will include the generation of engineering drawings, the shipment of equipment and the completion of a system performance test. As part of most of its contractual APC project agreements, Fuel Tech will agree to customer-specific acceptance criteria that relate to the operational performance of the system that is being sold. These criteria are determined based on modeling that is performed by Fuel Tech personnel, which is based on operational inputs that are provided by the customer. The customer will warrant that these operational inputs are accurate as they are specified in the binding contractual agreement. Further, the customer is solely responsible for the accuracy of the operating condition information; typically all performance guarantees and equipment warranties granted by us are voidable if the operating condition information is inaccurate or is not met. Since control transfers over time, revenue is recognized based on the extent of progress towards completion of the single performance obligation. Fuel Tech uses the cost-to-cost input measure of progress for our contracts since it best depicts the transfer of assets to the customer which occurs as we incur costs on our contracts. Under the cost-to-cost input measure of progress, the extent of progress towards completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. Revenues are recorded proportionally as costs are incurred. Costs to fulfill include all internal and external engineering costs, equipment charges, inbound and outbound freight expenses, internal and site transfer costs, installation charges, purchasing and receiving costs, inspection costs, warehousing costs, project personnel travel expenses and other direct and indirect expenses specifically identified as project- or product-line related, as appropriate (e.g. test equipment depreciation and certain insurance expenses). Fuel Tech has installed over 1,000 units with APC technology and normally provides performance guarantees to our customers based on the operating conditions for the project. As part of the project implementation process, we perform system start-up and optimization services that effectively serve as a test of actual project performance. We believe that this test, combined with the accuracy of the modeling that is performed, enables revenue to be recognized prior to the receipt of formal customer acceptance. Disaggregated Revenue by Product Technology 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 |
Disaggregated Revenue 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 |
Timing of Revenue Recognition 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 |
Contract Balances The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits (contract liabilities) on the consolidated balance sheets. In our Air Pollution Control Technology segment, amounts are billed as work progresses in accordance with agreed-upon contractual terms. Generally, billing occurs subsequent to revenue recognition, resulting in contract assets. These assets are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period. At June 30, 2019 and December 31, 2018, contract assets were approximately $2,338 and $5,540, respectively, and are included in accounts receivable on the consolidated balance sheets. However, the Company will periodically bill in advance of costs incurred before revenue is recognized, resulting in contract liabilities. These liabilities are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period. Contract liabilities were $1,147 and $1,234, at June 30, 2019 and December 31, 2018, respectively, and are included in other accrued liabilities on the consolidated balance sheets. Changes in the contract asset and liability balances during the six month period ended June 30, 2019, were not materially impacted by any other items other than amounts billed and revenue recognized as described previously. Revenue recognized that was included in the contract liability balance at the beginning of the period was $707 and $926 for the three and six months ended June 30, 2019 and $216 and $2,158 for three and six months ended June 30, 2018, respectively, which represented primarily revenue from progress towards completion of our Air Pollution Control technology contracts. As of June 30, 2019, we had six construction contracts in progress that were identified as loss contracts and a provision for losses of $73 was recorded in other accrued liabilities on the consolidated balance sheet. Refer to Footnote 14 for an accrual related to certain non-conformance issues with a U.S. customer associated with equipment that requires remedy under the warranty provision of the customer contract. As of December 31, 2018, we had five construction contracts in progress that were identified as loss contracts and a provision for losses in the amount of $123 was recorded in other accrued liabilities on the consolidated balance sheet. Remaining Performance Obligations Remaining performance obligations, represents the transaction price of Air Pollution Control technology booked orders for which work has not been performed. As of June 30, 2019, the aggregate amount of the transaction price allocated to remaining performance obligations was $7,953. The Company expects to recognize revenue on approximately $6,257 of the remaining performance obligations over the next 12 months with the remaining recognized thereafter. Accounts Receivable 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 The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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