unit could decline. A future decline in the fair value of the Tegra reporting unit could result a charge to our earnings as a result of a write-down of the value of the goodwill associated with that reporting unit.



Our next annual evaluation of the goodwill by reporting unit will be performed during the fourth quarter of fiscal year 2016, or earlier if indicators of potential impairment exist. Such indicators include, but are not limited to, challenging economic conditions, such as a decline in our operating results, an unfavorable industry or macroeconomic environment, a substantial decline in our stock price, or any other adverse change in market conditions. Such conditions could have the effect of changing one of the critical assumptions or estimates we use to calculate the fair value of our reporting units, which could result in a decrease in fair value and require us to record goodwill impairment charges.



Cash Equivalents and Marketable Securities



Cash equivalents consist of financial instruments which are readily convertible into cash and have original maturities of three months or less at the time of acquisition.  Marketable securities consist primarily of highly liquid investments with maturities of greater than three months when purchased.  



We measure our cash equivalents and marketable securities at fair value. The fair values of our financial assets and liabilities are determined using quoted market prices of identical assets or quoted market prices of similar assets from active markets. Our Level 1 assets consist of our money market funds. We classify securities within Level 1 assets when the fair value is obtained from real time quotes for transactions in active exchange markets involving identical assets. Our available-for-sale securities are classified as having Level 2 inputs. Our Level 2 assets are valued utilizing a market approach where the market prices of similar assets are provided by a variety of independent industry standard data providers to our investment custodian. Most of our cash equivalents and marketable securities are valued based on Level 2 inputs. We did not have any investments classified as Level 3 as of January 25, 2015.



All of our available-for-sale investments are subject to a periodic impairment review. We record a charge to earnings when a decline in fair value is significantly below cost basis and judged to be other-than-temporary, or have other indicators of impairments.



If the fair value of an available-for-sale debt instrument is less than its amortized cost basis, an other-than-temporary impairment is triggered in circumstances where (1) we intend to sell the instrument, (2) it is more likely than not that we will be required to sell the instrument before recovery of its amortized cost basis, or (3) a credit loss exists where we do not expect to recover the entire amortized cost basis of the instrument. In these situations, we recognize an other-than-temporary impairment in earnings equal to the entire difference between the debt instruments’ amortized cost basis and its fair value. For available-for-sale debt instruments that are considered other-than-temporarily impaired due