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Available-for-Sale Securities | 9 Months Ended
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Sep. 30, 2012
Available-for-Sale Securities |
Available-for-Sale Securities |
4. Available-for-Sale Securities The following table is a summary of available-for-sale debt securities recorded in cash and cash equivalents, short-term investments, long-term marketable securities, or restricted cash in the Company’s condensed consolidated balance sheets. Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services:
|  | September 30, 2012 |
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
U.S. government securities |  | $ | 30,233 |  | $ | 9 |  | $ | — |  | $ | 30,242 |
U.S. government agencies |  | 107,073 |  | 69 |  | (1 | ) | 107,141 |
U.S. corporate notes |  | 98,599 |  | 45 |  | (7 | ) | 98,637 |
U.S. commercial paper |  | 37,336 |  | 1 |  | — |  | 37,337 |
Money market funds |  | 85,634 |  | — |  | — |  | 85,634 |
Total |  | $ | 358,875 |  | $ | 124 |  | $ | (8 | ) | $ | 358,991 |
|  | December 31, 2011 |
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
U.S. government securities |  | $ | 66,150 |  | $ | 24 |  | $ | — |  | $ | 66,174 |
U.S. government agencies |  | 93,183 |  | 9 |  | (17 | ) | 93,175 |
U.S. corporate notes |  | 2,707 |  | — |  | (2 | ) | 2,705 |
U.S. commercial paper |  | 34,973 |  | 3 |  | — |  | 34,976 |
Money market funds |  | 38,721 |  | — |  | — |  | 38,721 |
Total |  | $ | 235,734 |  | $ | 36 |  | $ | (19 | ) | $ | 235,751 |
The following table summarizes the classification of the available-for-sale debt securities on the Company’s condensed consolidated balance sheets:
(in thousands) |  | September 30, 2012 |  | December 31, 2011 |
Cash and cash equivalents |  | $ | 107,987 |  | $ | 38,721 |
Short-term investments |  | 161,209 |  | 196,137 |
Long-term marketable securities |  | 88,962 |  | — |
Restricted cash |  | 833 |  | 893 |
Total |  | $ | 358,991 |  | $ | 235,751 |
At September 30, 2012, all of the marketable securities have contractual maturities within two years and the average duration of marketable securities was approximately nine months. The Company does not intend to sell the investments which are in an unrealized loss position and it is unlikely that the Company will be required to sell the investments before recovery of their amortized cost basis, which may be maturity. The Company has determined that the gross unrealized losses on its marketable securities at September 30, 2012, were temporary in nature. All marketable securities with unrealized losses have been in a loss position for less than twelve months.

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