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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2015
Marketable Securities [Abstract] |
Amortized Cost And Fair Value Of Marketable Securities |
As of March 31, 2015 |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Corporate bonds |  | $ | 110,782 |  | $ | 30 |  | $ | 97 |  | $ | 110,715 |
Agency bonds |  |  | 16,104 |  |  | - |  |  | 4 |  |  | 16,100 |
U.S. government bonds |  |  | 5,091 |  |  | - |  |  | - |  |  | 5,091 |
Certificate of deposit |  |  | 3,000 |  |  | - |  |  | - |  |  | 3,000 |
Commercial paper |  |  | 1,496 |  |  | - |  |  | - |  |  | 1,496 |
International government bond |  |  | 1,410 |  |  | - |  |  | 1 |  |  | 1,409 |
Municipal bond |  |  | 1,400 |  |  | 4 |  |  | - |  |  | 1,404 |
Total marketable securities |  | $ | 139,283 |  | $ | 34 |  | $ | 102 |  | $ | 139,215 |
Contractual Maturities Of Marketable Securities |
As of March 31, 2015 |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 74,100 |  | $ | 74,062 |
Due after one through two years |  |  | 65,183 |  |  | 65,153 |
|  | $ | 139,283 |  | $ | 139,215 |

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