Pursuant to the authoritative guidance, we are required to estimate the
expected forfeiture rate and only recognize expense for those shares expected to
vest. When estimating forfeitures, we consider voluntary termination behavior as
well as future workforce reduction programs. Estimated forfeiture is trued up to
actual forfeiture as the equity awards vest. The total fair value of the equity
awards, net of forfeiture, is recorded on a straight-line basis over the
requisite service periods of the awards, which is generally the vesting period,
except for performance-based Full Value Awards and options with market
conditions which are amortized based upon a graded vesting method.
Our investments in debt securities and marketable equity securities are primarily classified as available-for-sale investments or trading securities and are recorded at fair value. The cost of securities sold is based on the specific identification method. Unrealized gains and losses on available-for-sale 39
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investments, net of tax, are reported as a separate component of our Consolidated Statements of Stockholders' Equity. Unrealized gains or losses on trading securities resulting from changes in fair value are recognized currently in earnings. Our short-term investments include securities with stated maturities of longer than twelve months which are classified as current assets as they are highly liquid and available to support current operations. We periodically review our investments for impairment. If a debt security's market value is below amortized cost and we either intend to sell the security or it is more likely than not that we will be required to sell the security before its anticipated recovery, we record an other-than-temporary impairment charge to investment income (loss) for the entire amount of the impairment; if a debt security's market value is below amortized cost and we do not expect to recover the entire amortized cost of the security, we separate the other-than-temporary impairment into the portion of the loss related to credit factors, or the credit loss portion, and the portion of the loss that is not related to credit factors, or the non-credit loss portion. The credit loss portion is the difference between the amortized cost of the security and our best estimate of the present value of the cash flows expected to be collected from the debt security. The non-credit loss portion is the residual amount of the other-than-temporary impairment. The credit loss portion is recorded as a charge to income (loss), and the non-credit loss portion is recorded as a separate component of our Consolidated Statements of Comprehensive Income (Loss).
We assess the value of our inventory on a quarterly basis and write-down those inventories which are obsolete or in excess of our forecasted usage to their estimated realizable value. Our estimates of realizable value are based upon our analysis and assumptions including, but not limited to, forecasted sales levels by product, expected product lifecycle, product development plans and future demand requirements. Our product line management personnel play a key role in our excess review process by providing updated sales forecasts, managing product rollovers and working with manufacturing to maximize recovery of excess inventory. If actual market conditions are less favorable than our forecasts or actual demand from our customers is lower than our estimates, we may be required to record additional inventory write-downs. If actual market conditions are more favorable than anticipated, inventory previously written down may be sold, resulting in lower cost of sales and higher income from operations than expected in that period.