We record inventories at the lower of cost or market value on a FIFO basis. We assess the value of our inventories periodically based upon numerous factors including expected product or material demand, current market conditions, technological obsolescence, current cost and net realizable value. If necessary, we write down our inventory for estimated obsolescence, potential shrinkage, or unmarketable inventory equal to the difference between the cost of inventory and the estimated market value based upon assumptions about future demand and market conditions. If technology changes more rapidly than expected, or market conditions become less favorable than those projected by management, additional inventory write-downs may be required.
We provide for the estimated cost of product warranties at the time revenue is recognized. We engage in extensive product quality programs and processes, including active monitoring and evaluation of product failure rates, material usage and estimation of service delivery costs incurred in correcting a product failure. However, should actual product failure rates, material usage, or service delivery costs differ from our estimates, revisions to the estimated warranty liability would be required. Historically our warranty costs have not been significant.
Legal and Other Contingencies
The outcomes of legal proceedings and claims brought against us are subject to significant uncertainty. An estimated loss from a loss contingency such as a legal proceeding or claim is accrued by a charge to income if it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. When legal costs that the entity expects to incur in defending itself in connection with a loss contingency accrual are expected to be material, the loss should factor in all costs and, if the legal costs are reasonably estimable, they should be accrued in accordance with ASC 450, regardless of whether a liability can be estimated for the contingency itself. Disclosure of a contingency is required if there is at least a reasonable possibility that a loss has been incurred. Changes in these factors could materially impact our financial statements.
Share-based compensation is accounted for in accordance with ASC 718, "Compensation - Stock Compensation." We use the Black-Scholes option-pricing model to determine fair value of the award at the date of grant and recognize compensation expense over the vesting period. The inputs we use for the model require the use of judgment, estimates and assumptions regarding the expected volatility of the stock, the expected term the average employee will hold the option prior to the date of exercise, expected future dividends, and the amount of share-based awards that are expected to be forfeited. Changes in these inputs and assumptions could occur and actual results could differ from these estimates, and our results of operations could be materially impacted.
Accounting for Income Taxes
We estimate our tax liability based on current tax laws in the statutory jurisdictions in which we operate in accordance with ASC 740, "Income Taxes." These estimates include judgments about deferred tax assets and liabilities resulting from temporary differences between assets and liabilities recognized for financial reporting purposes and such amounts recognized for tax purposes, as well as about the realization of deferred tax assets. We may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such a position should be measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. ASC 740 also provides guidance on derecognition of income tax assets and liabilities, classification of current and deferred income tax assets and liabilities, accounting for interest and penalties associated with tax positions, and income tax disclosures.