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Organization and Significant Accounting Policies | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Organization and significant accounting policies | ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES Organization Fuel Tech, Inc. and subsidiaries ("Fuel Tech", the "Company", "we", "us" or "our") provides advanced engineered solutions for the optimization of combustion systems in utility and industrial applications. Our primary focus is on the worldwide marketing and sale of NO x reduction technologies as well as our FUEL CHEM program. The Company’s NO x reduction technologies reduce nitrogen oxide emissions from boilers, furnaces and other stationary combustion sources. Our FUEL CHEM program is based on proprietary TIFI® Targeted In-Furnace™ Injection technology, in combination with advanced Computational Fluid Dynamics (CFD) and Chemical Kinetics Modeling (CKM) boiler modeling, in the unique application of specialty chemicals to improve the efficiency, reliability and environmental status of combustion units by controlling slagging, fouling, corrosion, opacity and other sulfur trioxide-related issues in the boiler. Our business is materially dependent on the continued existence and enforcement of air quality regulations, particularly in the United States. We have expended significant resources in the research and development of new technologies in building our proprietary portfolio of air pollution control, fuel and boiler treatment chemicals, computer modeling and advanced visualization technologies. International revenues were $22,179, $28,116, and $46,063 for the years ended December 31, 2015, 2014 and 2013, respectively. These amounts represented 30%, 36%, and 42% of Fuel Tech’s total revenues for the respective periods of time. Foreign currency changes did not have a material impact on the calculation of these percentages. We have foreign offices in Beijing, China and Gallarate, Italy. Basis of Presentation The consolidated financial statements include the accounts of Fuel Tech and its wholly-owned subsidiaries. All intercompany transactions have been eliminated. Use of Estimates The preparation of the financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company uses estimates in accounting for, among other items, revenue recognition, allowance for doubtful accounts, income tax provisions and warranty expenses. Actual results could differ from those estimates. Fair Value of Financial Instruments The carrying values of cash and cash equivalents, accounts receivable, and accounts payable are reasonable estimates of their fair value due to their short-term nature. The carrying amount of our short-term debt under our revolving line of credit facility approximates fair value due to its short-term nature and because the amount outstanding accrues interest at a variable market-based rate. Our marketable securities are carried at fair value based on quoted market prices in an active market. Cash and Cash Equivalents We include cash and investments having an original maturity of three months or less at the time of acquisition in cash and cash equivalents. We have never incurred realized or unrealized holdings gains or losses on securities classified as cash equivalents. Income resulting from short-term investments is recorded as interest income. At December 31, 2015, we had cash on hand of approximately $5,596 at our Beijing, China subsidiary that is subject to certain local regulations that may limit the immediate availability of these funds outside of China. Cash on hand at our Italy subsidiary totaled approximately $1,286 at December 31, 2015. Foreign Currency Risk Management Our earnings and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. We do not enter into foreign currency forward contracts or into foreign currency option contracts to manage this risk due to the nature of the transactions involved. Accounts Receivable Accounts receivable consist of amounts due to us in the normal course of our business, are not collateralized, and normally do not bear interest. Accounts receivable includes unbilled receivables, representing costs and estimated earnings in excess of billings on uncompleted contracts under the percentage of completion method. At December 31, 2015 and 2014, unbilled receivables were approximately $7,312 and $9,904, respectively. Allowance for Doubtful Accounts The allowance for doubtful accounts is our management's best estimate of the amount of credit losses in accounts receivable. In order to control and monitor the credit risk associated with our customer base, we review the credit worthiness of customers on a recurring basis. Factors influencing the level of scrutiny include the level of business the customer has with Fuel Tech, the customer’s payment history, and the customer’s financial stability. Receivables are considered past due if payment is not received by the date agreed upon with the customer, which is normally 30 days. Representatives of our management team review all past due accounts on a weekly basis to assess collectability. At the end of each reporting period, the allowance for doubtful accounts balance is reviewed relative to management’s collectability assessment and is adjusted if deemed necessary through a corresponding charge or credit to bad debts expense, which is included in selling, general, and administrative expenses in the consolidated statements of operations. Bad debt write-offs are made when management believes it is probable a receivable will not be recovered. The table below sets forth the components of the Allowance for Doubtful Accounts for the years ended December 31.
Year |  | Balance at January 1 |  | Provision charged to expense |  | Write-offs / Recoveries |  | Balance at December 31
2013 |  | $ | 460 |  |  | $ | 1,175 |  |  | $ | (446 | ) |  | $ | 1,189 |
2014 |  | $ | 1,189 |  |  | $ | 1,099 |  |  | $ | (366 | ) |  | $ | 1,922 |
2015 |  | $ | 1,922 |  |  | $ | — |  |  | $ | (150 | ) |  | $ | 1,772 |
Prepaid expenses and other current assets Prepaid expenses and other current assets includes Chinese banker acceptances of $2,144 and $2,259 as of December 31, 2015 and 2014. These are short-term commitments of typically 30 to 60 days for future payments and can be redeemed at a discount or applied to future vendor payments. Inventories Inventories consist primarily of spare parts and are stated at the lower of cost or market using the first-in, first-out method. Usage is recorded in cost of sales in the period that parts were issued to a project or used to service equipment. Inventories are periodically evaluated to identify obsolete or otherwise impaired parts and are written off when management determines usage is not probable. Foreign Currency Translation and Transactions Assets and liabilities of consolidated foreign subsidiaries are translated into U.S. dollars at exchange rates in effect at year end. Revenues and expenses are translated at average exchange rates prevailing during the year. Gains or losses on foreign currency transactions and the related tax effects are reflected in net income. The resulting translation adjustments are included in stockholders’ equity as part of accumulated other comprehensive income. Accumulated Other Comprehensive (Loss) Income The changes in accumulated other comprehensive (loss) income by component were as follows:
|  | December 31,
|  | 2015 |  | 2014
Foreign currency translation |  |  |  |
Balance at beginning of period |  | $ | (471 | ) |  | $ | 18 |
Other comprehensive (loss) income: |  |  |  |
Foreign currency translation adjustments (1) |  | (1,097 | ) |  | (489 | )
Balance at end of period |  | $ | (1,568 | ) |  | $ | (471 | )
Available-for-sale marketable securities |  |  |  |
Balance at beginning of period |  | $ | 23 |  |  | $ | 19 |
Other comprehensive income (loss): |  |  |  |
Net unrealized holding gain (loss) (2) |  | (11 | ) |  | 4 |
Deferred income taxes (2) |  | — |  |  | — |
Total other comprehensive income (loss) |  | (11 | ) |  | 4 |
Balance at end of period |  | $ | 12 |  |  | $ | 23 |
Total accumulated other comprehensive (loss) income |  | $ | (1,556 | ) |  | $ | (448 | )
(1) | In all periods presented, there were no tax impacts related to rate changes and no amounts were reclassified to earnings.
(2) | In all periods presented, there were no realized holding gains or losses and therefore no amounts were reclassified to earnings.
Research and Development Research and development costs are expensed as incurred. Research and development projects funded by customer contracts are reported as part of cost of goods sold. Internally funded research and development expenses are reported as operating expenses. Product/System Warranty We typically warrant our air pollution control products and systems against defects in design, materials and workmanship for one to two years. A provision for estimated future costs relating to warranty expense is recorded when the products/systems become commercially operational. Goodwill Goodwill is not amortized, but is reviewed annually or more frequently if indicators arise, for impairment. Our evaluation of goodwill impairment involves first assessing qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. We may bypass this qualitative assessment, or determine that based on our qualitative assessment considering the totality of events and circumstances including macroeconomic factors, industry and market considerations, current and projected financial performance, a sustained decrease in our share price, or other factors, that additional impairment analysis is necessary. This additional analysis involves comparing the current fair value of our reporting units to their carrying values. We use a discounted cash flow (DCF) model to determine the current fair value of our two reporting units. A number of significant assumptions and estimates are involved in the application of the DCF model to forecast operating cash flows, including markets and market share, sales volumes and prices, costs to produce and working capital changes. Management considers historical experience and all available information at the time the fair values of its reporting units are estimated. However, actual fair values that could be realized in an actual transaction may differ from those used to evaluate the impairment of goodwill. Goodwill is allocated to each of our reporting units, which is defined as an operating segment or one level below an operating segment, upon acquisition after considering the nature of the net assets giving rise to the goodwill and how each reporting unit would enjoy the benefits and synergies of the net assets acquired. Goodwill is also evaluated for impairment at the reporting unit level. We have two reporting units for goodwill evaluation purposes: the FUEL CHEM technology segment and the APC technology segment. There is no goodwill associated with either our APC or Fuel Conversion business segment. During the fourth quarter of 2014, we experienced a decrease in our stock price that caused our market capitalization to fall below the equity value on our consolidated balance sheet, which can be a potential indicator of goodwill impairment. This, along with an overall slowdown in APC technology segment orders and corresponding downward adjustments to our financial forecasts, was considered during a detailed evaluation of the fair value of our reporting units. Fuel Tech performed its annual goodwill impairment analysis for each of its reporting units as of October 1, 2014 and determined that no impairment of goodwill existed within the FUEL CHEM technology segment. At the same time, we determined that our APC technology reporting unit failed the first step test because the estimated fair value of the reporting unit was less than its carrying value, thus requiring additional analysis of the segment. Based on this additional analysis, Fuel Tech determined that the fair value of the APC technology reporting unit as of the test date was less than the fair value of the assets and liabilities of the unit, resulting in an implied fair value of goodwill of zero, and accordingly we recorded a non-cash goodwill impairment charge in the fourth quarter of 2014 of $23,400 representing the full carrying value of goodwill related to this reporting unit. The following table shows our goodwill activity by reporting unit during the periods ending December 31, 2015 and 2014:
|  | 2015
Reporting Unit |  | Beginning Carrying Amount |  | Acquired Goodwill |  | Impairment Charge |  | Ending Carrying Amount
FUEL CHEM Technology Segment |  | $ | 2,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,116 |
APC Technology Segment |  | — |  |  | — |  |  | — |  |  | — |
|  | $ | 2,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,116 |
|  | 2014
Reporting Unit |  | Beginning Carrying Amount |  | Acquired Goodwill |  | Impairment Charge |  | Ending Carrying Amount
FUEL CHEM Technology Segment |  | $ | 2,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,116 |
APC Technology Segment |  | 18,935 |  |  | 4,465 |  |  | (23,400 | ) |  | — |
|  | $ | 21,051 |  |  | $ | 4,465 |  |  | $ | (23,400 | ) |  | $ | 2,116 |
Other Intangible Assets Management reviews other finite-lived intangible assets, which include customer lists and relationships, covenants not to compete, patent assets, trade names, and acquired technologies, for impairment when events or changes in circumstances indicate the carrying amount of an asset or asset group may not be recoverable. In the event that impairment indicators exist, a further analysis is performed and if the sum of the expected undiscounted future cash flows resulting from the use of the asset or asset group is less than the carrying amount of the asset or asset group, an impairment loss equal to the excess of the asset or asset group's carrying value over its fair value is recorded. Management considers historical experience and all available information at the time the estimates of future cash flows are made, however, the actual cash values that could be realized may differ from those that are estimated. In the fourth quarter of 2015, the Company performed an impairment test of the carrying value of our intangible assets to determine whether any impairment existed. The Company determined that the sum of the expected undiscounted cash flows attributable to certain intangible assets was less than its carrying value and that an impairment write-down was required. The impairment loss primarily related to the customer lists acquired in the 2009 acquisition of Advanced Combustion Technology and the 2014 acquisition of PECO. The Company calculated the estimated fair value of the intangible asset by summing the present value of the expected cash flows over its life. The impairment was calculated by deducting the present value of the expected cash flows from the carrying value. This assessment resulted in an impairment write-down of $1,425, which was included in “Goodwill and intangible assets impairment” in the accompanying Consolidated Statements of Operations for the year ended December 31, 2015. Third-party costs related to the development of patents are included within other intangible assets on the consolidated balance sheets. As of December 31, 2015 and 2014, the net patent asset balance, excluding patents acquired in business acquisitions, was $1,699 and $1,583, respectively. The third-party costs capitalized as patent costs during the years ended December 31, 2015 and 2014 were $244 and $376, respectively. Third-party costs are comprised of legal fees that relate to the review and preparation of patent disclosures and filing fees incurred to present the patents to the required governing body. Our intellectual property portfolio has been a significant building block for the Air Pollution Control and FUEL CHEM technology segments. The patents are essential to the generation of revenue for our businesses and are essential to protect us from competition in the markets in which we serve. These costs are being amortized on the straight-line method over the period beginning with the patent issuance date and ending on the patent expiration date. Patent maintenance fees are charged to operations as incurred. In 2014 we acquired intangible assets as a result of the business acquisitions described in Note 2 in the amount of $5,158. In addition, we acquired intellectual property rights and know-how that was not part of a business acquisition in the amount of $3,010 related to the CARBONITE® fuel conversion process that has an estimated useful life of 5 years. Amortization expense for intangible assets was $2,138, $2,384 and $839 for the years ended December 31, 2015, 2014 and 2013, respectively. The table below shows the amortization period and other intangible asset cost by intangible asset as of December 31, 2015 and 2014, and the accumulated amortization and net intangible asset value in total for all other intangible assets.
|  |  |  | 2015 |  | 2014
Description of Other Intangibles |  | Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships |  | 4-15 years |  | $ | 3,633 |  |  | $ | (3,114 | ) |  | $ | 519 |  |  | $ | 5,087 |  |  | $ | (2,690 | ) |  | $ | 2,397 |
Trademarks and trade names |  | 4-8 years |  | 441 |  |  | (382 | ) |  | 59 |  |  | 441 |  |  | (293 | ) |  | 148 |
Patent assets |  | 1-15 years |  | 3,007 |  |  | (1,210 | ) |  | 1,797 |  |  | 2,764 |  |  | (987 | ) |  | 1,777 |
Acquired technologies |  | 5-8 years |  | 7,515 |  |  | (2,746 | ) |  | 4,769 |  |  | 7,974 |  |  | (1,832 | ) |  | 6,142 |
Total |  |  |  | $ | 14,596 |  |  | $ | (7,452 | ) |  | $ | 7,144 |  |  | $ | 16,266 |  |  | $ | (5,802 | ) |  | $ | 10,464 |
The table below shows the estimated future amortization expense for intangible assets:
Year | Estimated Amortization Expense
2016 | $ | 1,700 |
2017 | 1,374 |
2018 | 1,269 |
2019 | 1,016 |
2020 | 564 |
Thereafter | 1,221 |
Total | $ | 7,144 |
Property and Equipment Property and equipment is stated at historical cost. Provisions for depreciation are computed by the straight-line method, using estimated useful lives that range based on the nature of the asset. Leasehold improvements are depreciated over the shorter of the associated lease term or the estimated useful life of the asset. Depreciation expense was $2,067, $1,922, and $2,175 for the years ended December 31, 2015, 2014 and 2013, respectively. The table below shows the depreciable life and cost by asset class as of December 31, 2015 and 2014, and the accumulated depreciation and net book value in total for all classes of assets.
Description of Property and Equipment |  | Depreciable Life |  | 2015 |  | 2014
Land |  |  |  | $ | 1,440 |  |  | $ | 1,440 |
Building |  | 39 years |  | 4,535 |  |  | 4,535 |
Building and leasehold improvements |  | 3-39 years |  | 5,102 |  |  | 5,115 |
Field equipment |  | 3-4 years |  | 19,797 |  |  | 19,796 |
Computer equipment and software |  | 2-3 years |  | 2,978 |  |  | 3,005 |
Furniture and fixtures |  | 3-10 years |  | 1,527 |  |  | 1,525 |
Vehicles |  | 5 years |  | 36 |  |  | 36 |
Total cost |  |  |  | 35,415 |  |  | 35,452 |
Less accumulated depreciation |  |  |  | (23,414 | ) |  | (21,925 | )
Total net book value |  |  |  | $ | 12,001 |  |  | $ | 13,527 |
Property and equipment is reviewed for impairment when events and circumstances indicate that the carrying amount of the assets (or asset group) may not be recoverable. If impairment indicators exists, we perform a more detailed analysis and an impairment loss is recognized when estimated future undiscounted cash flows expected to result from the use of the asset (or asset group) and its eventual disposition are less than the carrying amount. This process of analyzing impairment involves examining the operating condition of individual assets (or asset group) and estimating a fair value based upon current condition, relevant market factors and remaining estimated operational life compared to the asset’s remaining depreciable life. Quoted market prices and other valuation techniques are used to determine expected cash flows. Due to the existence of impairment indicators as more fully described above, we performed a more detailed analysis of potential long-lived asset impairment in the APC technology asset group during the fourth quarter of 2015 using the aforementioned undiscounted cash flows analysis and concluded that no impairment of our fixed assets exists. A significant portion of our property and equipment is comprised of assets deployed at customer locations relating to our FUEL CHEM technology asset group, and due to the shorter-term duration over which this equipment is depreciated, the likelihood of impairment is mitigated. The discontinuation of a FUEL CHEM program at a customer site would most likely result in the re-deployment of all or most of the affected assets to another customer location rather than an impairment. Revenue Recognition Revenues from the sales of chemical products are recorded when title transfers, either at the point of shipment or at the point of destination, depending on the contract with the customer. We utilize the percentage of completion method of accounting for equipment construction and license contracts that are sold within the Air Pollution Control technology segment. Under the percentage of completion method, revenues are recognized as work is performed based on the relationship between actual construction costs incurred and total estimated costs at completion. Construction costs include all direct costs such as materials, labor, subcontracting costs, and indirect costs allocable to the particular contract such as indirect labor, tools and equipment, and supplies. Revisions in completion estimates and contract values are made in the period in which the facts giving rise to the revisions become known and can influence the timing of when revenues are recognized under the percentage of completion method of accounting. Such revisions have historically not had a material effect on the amount of revenue recognized. Provisions are made for estimated losses on uncompleted contracts in the period in which such losses are determined. The completed contract method is used for certain contracts when reasonably dependable estimates of the percentage of completion cannot be made. When the completed contract method is used, revenue and costs are deferred until the contract is substantially complete, which usually occurs upon customer acceptance of the installed product. Cost of Sales Cost of sales includes all internal and external engineering costs, equipment and chemical 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). Certain depreciation and amortization expenses related to tangible and intangible assets, respectively, are allocated to cost of sales. Selling, General and Administrative Expenses Selling, general and administrative expenses primarily include the following categories except where an allocation to the cost of sales line item is warranted due to the project- or product-line nature of a portion of the expense category: salaries and wages, employee benefits, non-project travel, insurance, legal, rent, accounting and auditing, recruiting, telephony, employee training, Board of Directors’ fees, auto rental, office supplies, dues and subscriptions, utilities, real estate taxes, commissions and bonuses, marketing materials, postage and business taxes. Departments comprising the selling, general and administrative line item primarily include the functions of executive management, finance and accounting, investor relations, regulatory affairs, marketing, business development, information technology, human resources, sales, legal and general administration. Distribution Costs We classify shipping and handling costs in cost of sales in the consolidated statements of operations. Income Taxes The provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, the provision for income taxes represents income taxes paid or payable (or received or receivable) for the current year plus the change in deferred taxes during the year. Deferred taxes represent the future tax consequences expected to occur when the reported amounts of assets and liabilities are recovered or paid, and result from differences between the financial and tax bases of our assets and liabilities and are adjusted for changes in tax rates and tax laws when enacted. Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not that a tax benefit will not be realized. In evaluating the need for a valuation allowance, management considers all potential sources of taxable income, including income available in carryback periods, future reversals of taxable temporary differences, projections of taxable income, and income from tax planning strategies, as well as all available positive and negative evidence. Positive evidence includes factors such as a history of profitable operations, projections of future profitability within the carryforward period, including from tax planning strategies, and our experience with similar operations. Negative evidence includes items such as cumulative losses, projections of future losses, or carryforward periods that are not long enough to allow for the utilization of a deferred tax asset based on existing projections of income. Deferred tax assets for which no valuation allowance is recorded may not be realized upon changes in facts and circumstances. Tax benefits related to uncertain tax positions taken or expected to be taken on a tax return are recorded when such benefits meet a more likely than not threshold. Otherwise, these tax benefits are recorded when a tax position has been effectively settled, which means that the statute of limitation has expired or the appropriate taxing authority has completed their examination even though the statute of limitations remains open. Interest and penalties related to uncertain tax positions are recognized as part of the provision for income taxes and are accrued beginning in the period that such interest and penalties would be applicable under relevant tax law until such time that the related tax benefits are recognized. Stock-Based Compensation Our stock-based employee compensation plan, referred to as the Fuel Tech, Inc. 2014 Long-Term Incentive Plan (Incentive Plan), was adopted in May 2014 and allows for awards to be granted to participants in the form of non-qualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units, performance awards, and bonuses or other forms of share-based or non-share-based awards or combinations thereof. Participants in the Incentive Plan may be our directors, officers, employees, consultants or advisors (except consultants or advisors in capital-raising transactions) as the directors determine are key to the success of our business. There are a maximum of 4,400,676 shares that may be issued or reserved for awards to participants under the Incentive Plan as of December 31, 2015. Basic and Diluted Earnings per Common Share Basic earnings per share excludes the antidilutive effects of stock options, restricted stock units (RSUs) and the nil coupon non-redeemable convertible unsecured loan notes (see Note 7). Diluted earnings per share includes the dilutive effect of the nil coupon non-redeemable convertible unsecured loan notes, RSUs, and unexercised in-the-money stock options, except in periods of net loss where the effect of these instruments is antidilutive. Out-of-the-money stock options are excluded from diluted earnings per share because they are anti-dilutive. At December 31, 2015, 2014 and 2013, we had outstanding equity awards of 2,068,000, 1,628,000 and 1,623,000, respectively, that were antidilutive for the purpose of inclusion in the diluted earnings per share calculation because the exercise prices of the options were greater than the average market price of our common stock. As of December 31, 2015 and 2014, respectively, we had an additional 169,000 and 280,000 equity awards that were antidilutive because of the net loss in the year then ended. These equity awards could potentially dilute basic EPS in future years. The table below sets forth the weighted-average shares used at December 31 in calculating earnings (loss) per share:
|  | 2015 |  | 2014 |  | 2013
Basic weighted-average shares |  | 23,101,000 |  |  | 22,782,000 |  |  | 22,286,000 |
Conversion of unsecured loan notes |  | — |  |  | — |  |  | 7,000 |
Unexercised options and unvested restricted stock units |  | — |  |  | — |  |  | 286,000 |
Diluted weighted-average shares |  | 23,101,000 |  |  | 22,782,000 |  |  | 22,579,000 |
Risk Concentrations Financial instruments that potentially subject the Company to a significant concentration of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. However, management believes the Company is not exposed to significant credit risk due to the financial position of its primary depository institution where a significant portion of its deposits are held. For the year ended December 31, 2015, we had one customer which individually represented greater than 10% of revenues. This customer contributed primarily to our FUEL CHEM technology segment and represented 12% of consolidated revenues. We had no customers that accounted for greater than 10% of our current assets as of December 31, 2015. For the year ended December 31, 2014, we had two customers which individually represented greater than 10% of revenues. One of these customers contributed primarily to our FUEL CHEM technology segment and represented 20% of consolidated revenues. The other customer contributed to our APC technology segment and represented 11% of our consolidated revenues. We had no customers that accounted for greater than 10% of our current assets as of December 31, 2014. For the year ended December 31, 2013, we had two customer which individually represented greater than 10% of revenues. One of these customers contributed primarily to our FUEL CHEM technology segment and represented 14% of consolidated revenues. The other customer contributed to our APC technology segment and represented 18% of our consolidated revenues. We had no customers that accounted for greater than 10% of our current assets as of December 31, 2013. We control credit risk through requiring milestone payments on long-term contracts, performing ongoing credit evaluations of its customers, and in some cases obtaining security for payment through bank guarantees and letters of credit. Available-for-Sale Marketable Securities At the time of purchase, marketable securities are classified as available-for-sale as management has the intent and ability to hold such securities for an indefinite period of time, but not necessarily to maturity. Any decision to sell available-for-sale securities would be based on various factors, including, but not limited to asset/liability management strategies, changes in interest rates or prepayment risks and liquidity needs. Available-for-sale securities are carried at fair value with unrealized gains and losses, net of related deferred income taxes, recorded in equity as a separate component of other comprehensive income (OCI). Our marketable securities consist of a single equity investment with a fair value of $19 and $36 at December 31, 2015 and December 31, 2014, respectively. Purchases and sales of securities are recognized on a trade date basis. Realized securities gains or losses are reported in other income/(expense) in the Consolidated Statements of Operations. The cost of securities sold is based on the specific identification method. On a quarterly basis, we make an assessment to determine if there have been any events or circumstances to indicate whether a security with an unrealized loss is impaired on an other-than-temporary (OTTI) basis. This determination requires significant judgment. OTTI is considered to have occurred (1) if management intends to sell the security, (2) if it is more likely than not we will be required to sell the security before recovery of its amortized cost basis; or (3) the present value of the expected cash flows is not sufficient to recover the entire amortized cost basis. The credit-related OTTI, represented by the expected loss in principal, is recognized in non-interest income, while noncredit-related OTTI is recognized in OCI. For securities which we do expect to sell, all OTTI is recognized in earnings. Presentation of OTTI is made in the income statement on a gross basis with a reduction for the amount of OTTI recognized in OCI. Once an other-than-temporary impairment is recorded, when future cash flows can be reasonably estimated, future cash flows are re-allocated between interest and principal cash flows to provide for a level-yield on the security. We have not experienced any other-than-temporary impairments during the periods ended December 31, 2015, 2014 and 2013. Treasury Stock We use the cost method to account for its common stock repurchases. During the years ended December 31, 2015 and 2014, we withheld 84,486 and 58,649 shares of our Common Shares, valued at approximately $252 and $304, respectively, to settle personal tax withholding obligations that arose as a result of restricted stock units that vested. Refer to Note 6, “Treasury Stock,” for further discussion. Recently Issued and Adopted Accounting Standards In May 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09 "Revenue from Contracts with Customers" (Topic 606). This new accounting guidance on revenue recognition provides for a single five-step model to be applied to all revenue contracts with customers. The new standard also requires additional financial statement disclosures that will enable users to understand the nature, amount, timing and uncertainty of revenue and cash flows relating to customer contracts. In August 2015, the FASB approved a one-year deferral to January 1, 2018. Early adoption is permitted as of the original effective date. The standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. We are currently evaluating the impact of the new guidance on our financial statements and have not yet selected a transition approach to implement the standard. In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory. This new accounting guidance more clearly articulates the requirements for the measurement and disclosure of inventory. Topic 330, Inventory, currently requires an entity to measure inventory at the lower of cost or market. Market could be replacement cost, net realizable value, or net realizable value less an approximately normal profit margin. This new accounting guidance requires the measurement of inventory at lower of cost and net realizable value. ASU 2015-11 will be effective for the Company beginning on January 1, 2017. The adoption of this guidance in not expected to have a material impact on the Company’s consolidated financial statements. In November 2015, the FASB issued ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes. The amendments in this Update require that deferred tax liabilities and assets be classified as non-current in a classified statement of financial position. Current accounting principles require an entity to separate deferred income tax liabilities and assets into current and non-current amounts in a classified statement of financial position. ASU 2015-17 will be effective for the Company beginning on January 1, 2017. We are currently evaluating the impact of the new guidance on our financial statements and have not yet selected a transition approach to implement the standard. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The amendments in this Update increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 will be effective for the Company beginning on January 1, 2019. We are currently evaluating the impact of the new guidance on our financial statements and have not yet selected a transition approach to implement the standard.

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- Definition The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6003-108592 + Details
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