Table of Content contracts, as they are short term in nature, we recognize revenue as jobs are completed or costs are incurred. For contracts where control is transferred at a point in time, revenue is recognized at the time control of the asset is transferred to the customer, which is typically upon delivery and acceptance by the customer. The timing of revenue recognition, billings, and cash collections results in the recognition of trade accounts receivable, contract assets and contract liabilities on the consolidated balance sheets. Trade accounts receivable include billed and unbilled amounts currently due from customers and represent unconditional rights to receive consideration. The amounts due are stated at their net estimated realizable value. Refer to Note 4 - Accounts Receivable for additional information on our trade receivables, unbilled revenue and the allowance for credit losses. Contract assets include unbilled amounts when the revenue recognized exceeds the amount billed to the customer. Amounts may not exceed their net realizable value. Contract assets are included in "Prepaid expenses and other current assets” on our consolidated balance sheet. If we receive advances or deposits from our customers, a contract liability is recorded. Additionally, a contract liability arises if items of variable consideration result in less revenue being recorded than what is billed. We did not have a material amount of contract assets or contract liabilities as of December 31, 2023 and 2022. We recognize the incremental costs of obtaining contracts as selling, general and administrative expenses when incurred if the amortization period of the asset that otherwise would have been recognized is one year or less. Costs to fulfill a contract are recorded as assets if they relate directly to a contract or a specific anticipated contract, the costs are incurred to generate or enhance resources that will be used in satisfying performance obligations in the future, and the costs are expected to be recovered. Costs to fulfill a contract recognized as assets primarily consist of labor and material costs and generally relate to engineering and set-up costs incurred prior to when the satisfaction of performance obligations begins. Assets recognized for costs to fulfill a contract are included in the "Prepaid expenses and other current assets” line of the consolidated balance sheet and were not material as of December 31, 2023 and 2022. Such assets are recognized as expenses as we transfer the related goods or services to the customer and recognize the related revenue. All other costs to fulfill a contract are expensed as incurred. Fair value of financial instruments. As defined in Financial Accounting Standards Board ("FASB”) ASC 820 Fair Value Measurements and Disclosure ("ASC 820”), fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We utilize market data or assumptions that market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs can be readily observable, market corroborated, or generally unobservable. We primarily apply the market approach for recurring fair value measurements and endeavor to utilize the best information available. Accordingly, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The use of unobservable inputs is intended to allow for fair value determinations in situations in which there is little, if any, market activity for the asset or liability at the measurement date. We are able to classify fair value balances based on the observability of those inputs. ASC 820 establishes a fair value hierarchy such that "Level 1” measurements include unadjusted quoted market prices for identical assets or liabilities in an active market, "Level 2” measurements include quoted market prices for identical assets or liabilities in an active market which have been adjusted for items such as effects of restrictions for transferability and those that are not quoted but are observable through corroboration with observable market data, including quoted market prices for similar assets, and "Level 3” measurements include those that are unobservable and of a highly subjective measure. Our financial instruments consist primarily of cash, cash equivalents, accounts receivable, accounts payable, pension assets and debt obligations. The carrying amount of cash, cash equivalents, trade accounts receivable and accounts payable are representative of their respective fair values due to the short-term maturity of these instruments. For additional information regarding our pension assets, see Note 15 - Employee Benefit plan. The fair value of our 2022 ABL Credit Facility, ME/RE Loans, and Term Loans under the A&R Term Loan Credit Agreement are representative of the carrying value based upon the variable terms and management’s opinion that the current rates available to us with the same maturity and security structure are equivalent to that of the debt. The Notes were fully paid off on August 1, 2023, however, the fair value of the Notes as of December 31, 2022 was $37.5 million (inclusive of the fair value of the conversion option) and are a "Level 2” measurement, determined based on the observed trading price of these instruments. For additional information regarding our debt obligations, see Note 11 - Debt. Cash and cash equivalents. Cash and cash equivalents consist of all demand deposits and funds invested in highly liquid short-term investments with original maturities of three months or less. Inventory. Except for certain inventories that are valued based on standard cost, we use the first-in, first-out method to value our inventory. Inventory includes material, labor, and certain fixed overhead costs. Inventory is stated at the lower of cost and net realizable value. Inventory quantities on hand are reviewed periodically and carrying value is reduced to net realizable value for inventories for which their cost exceeds their utility. The cost of inventories consumed or products sold are included in operating expenses. 34