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Marketable Securities | 3 Months Ended
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Mar. 31, 2015
Marketable Securities [Abstract] |
Marketable Securities | Note 4. marketable securities The amortized cost and fair value of marketable securities were as follows (in thousands):
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 |
No marketable securities have been in a continuous unrealized loss position for more than twelve months. The marketable securities held by the Company were high investment grade and there were no marketable securities that we consider to be other-than-temporarily impaired as of March 31, 2015. The contractual maturities of marketable securities were as follows (in thousands):
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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