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Balance Sheet Information | 3 Months Ended
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Mar. 31, 2012
Balance Sheet Information |
Balance Sheet Information |
Note 4—Balance Sheet Information Short-term Investments Available-for-sale securities consist of the following (in thousands):
|  | March 31, 2012 |
|  | Amortized Cost |  | Gains in Accumulated Other Comprehensive Income |  | Losses in Accumulated Other Comprehensive Income |  | Estimated Fair Value |
Government Agency Securities |  | $ | 54,782 |  | $ | 44 |  | $ | — |  | $ | 54,826 |
FDIC insured corporate bonds |  | 106,331 |  | 45 |  | — |  | 106,376 |
Treasury bills |  | 86,626 |  | — |  | (2 | ) | 86,624 |
Total available-for-sale securities |  | $ | 247,739 |  | $ | 89 |  | $ | (2 | ) | $ | 247,826 |
|  | December 31, 2011 |
|  | Amortized Cost |  | Gains in Accumulated Other Comprehensive Income |  | Losses in Accumulated Other Comprehensive Income |  | Estimated Fair Value |
Government Agency Securities |  | $ | 88,585 |  | $ | 119 |  | $ | — |  | $ | 88,704 |
FDIC insured corporate bonds |  | 114,640 |  | 56 |  | — |  | 114,696 |
Treasury bills |  | 70,147 |  | 44 |  | — |  | 70,191 |
Total available-for-sale securities |  | $ | 273,372 |  | $ | 219 |  | $ | — |  | $ | 273,591 |
During the three months ended March 31, 2012, available-for-sale securities were sold for total proceeds of $43.6 million. The gross realized gains on these sales were minimal for the three months ended March 31, 2012. For purpose of determining gross realized gains, the cost of securities sold is based on specific identification. Net unrealized holding losses on available-for-sale securities of $0.1 million for the three months ended March 31, 2012, have been included in accumulated other comprehensive income. During the three months ended March 31, 2011, available-for-sale securities were sold for total proceeds of $122.1 million. The gross realized gains on these sales were minimal for the three months ended March 31, 2011. Net unrealized holding gains on available-for-sale securities of less than $0.1 million for the three months ended March 31, 2011, have been included in accumulated other comprehensive income. Contractual maturities of available-for-sale debt securities at March 31, 2012, are as follows (in thousands):
|  | Estimated Fair Value |
Due in one year or less |  | $ | 33,272 |
Due in 1—2 years |  | 214,554 |
Total investments in debt securities |  | $ | 247,826 |
Actual maturities may differ from contractual maturities because some borrowers have the right to call or prepay obligations with or without call or prepayment penalties. Restricted Cash As of March 31, 2012 and December 31, 2011, restricted cash consisted of $0.9 million and $0.6 million, respectively, which serves as collateral for bank guarantees that provide financial assurance that the Company will fulfill certain customer obligations. This cash is held in custody by the issuing bank, and is restricted as to withdrawal or use while the related bank guarantees are outstanding. Accounts Receivable, net Accounts receivable are shown net of the allowance for doubtful accounts of $0.5 million as of March 31, 2012 and December 31, 2011. Inventories Inventories are stated at the lower of cost (principally first-in, first-out) or market. Inventories consist of (in thousands):
|  | March 31, |  | December 31, |
|  | 2012 |  | 2011 |
Raw materials |  | $ | 60,786 |  | $ | 57,169 |
Work in process |  | 25,714 |  | 20,118 |
Finished goods |  | 16,776 |  | 36,147 |
|  | $ | 103,276 |  | $ | 113,434 |
Accrued Warranty We estimate the costs that may be incurred under the warranty we provide and record a liability in the amount of such costs at the time the related revenue is recognized. Factors that affect our warranty liability include product failure rates, material usage and labor costs incurred in correcting product failures during the warranty period. We periodically assess the adequacy of our recognized warranty liability and adjust the amount as necessary. Changes in our warranty liability during the period are as follows (in thousands):
|  | March 31, |
|  | 2012 |  | 2011 |
Balance as of the beginning of period |  | $ | 9,778 |  | $ | 9,238 |
Warranties issued during the period |  | 1,007 |  | 3,014 |
Settlements made during the period |  | (1,951 | ) | (2,121 | )
Balance as of the end of period |  | $ | 8,834 |  | $ | 10,131 |

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