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Invesments (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments |
Schedule of available-for-sale securities |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
|  |  | (in thousands) |
December 31, 2014 |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 81,506 |  | $ | 27 |  | $ | (6 | ) | $ | 81,527 |
Corporate debt |  | 39,031 |  | 20 |  | (6 | ) | 39,045 |
Total available-for-sale securities |  | $ | 120,537 |  | $ | 47 |  | $ | (12 | ) | $ | 120,572 |
December 31, 2013 |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 130,956 |  | $ | 22 |  | $ | (1 | ) | $ | 130,977 |
Government agency securities |  | 61,004 |  | 9 |  | — |  | 61,013 |
Corporate debt |  | 77,582 |  | 55 |  | (36 | ) | 77,601 |
Commercial paper |  | 11,947 |  | — |  | — |  | 11,947 |
Total available-for-sale securities |  | $ | 281,489 |  | $ | 86 |  | $ | (37 | ) | $ | 281,538 |
Schedule of available-for-sale securities in a loss position |
|  |  | December 31, 2014 |  |  | December 31, 2013 |
|  |  | Estimated |  |  | Gross |  |  | Estimated |  |  | Gross |
|  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (in thousands) |
U.S. treasuries |  | $ | 35,001 |  | $ | (6 | ) | $ | 29,068 |  | $ | (1 | )
Corporate debt |  | 13,069 |  | (6 | ) | 37,654 |  | (36 | )
Total |  | $ | 48,070 |  | $ | (12 | ) | $ | 66,722 |  | $ | (37 | )
Schedule of contractual maturities of available-for-sale securities |
|  |  | December 31, 2014 |
|  |  |  |  |  | Estimated |
|  |  | Amortized |  |  | Fair |
|  |  | Cost |  |  | Value |
|  |  | (in thousands) |
Due in one year or less |  | $ | 74,710 |  | $ | 74,718 |
Due after one year through two years |  | 45,827 |  | 45,854 |
Total |  | $ | 120,537 |  | $ | 120,572 |

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