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Cash and Cash Equivalents and Investments (Tables) | 3 Months Ended
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Mar. 31, 2015
Cash and Cash Equivalents and Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block] |
|  | As of March 31, 2015
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  | (in thousands)
Cash and cash equivalents |  | $ | 41,960 |  |  | $ | — |  |  | $ | — |  |  | $ | 41,960 |
Securities maturing within one year: |  |  |  |  |  |  |  |
Certificates of deposit |  | 552 |  |  | — |  |  | — |  |  | 552 |
U.S. treasury securities |  | 272,562 |  |  | 50 |  |  | (27 | ) |  | 272,585 |
Total short-term investments |  | $ | 273,114 |  |  | $ | 50 |  |  | $ | (27 | ) |  | $ | 273,137 |
Total cash and cash equivalents and investments |  | $ | 315,074 |  |  | $ | 50 |  |  | $ | (27 | ) |  | $ | 315,097 |
|  | As of December 31, 2014
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  |  | (in thousands) |  |
Cash and cash equivalents |  | $ | 137,266 |  |  | $ | — |  |  | $ | — |  |  | $ | 137,266 |
Securities maturing within one year: |  |  |  |  |  |  |  |
Certificates of deposit |  | 552 |  |  | — |  |  | — |  |  | 552 |
U.S. treasury securities |  | 201,584 |  |  | 3 |  |  | (66 | ) |  | 201,521 |
Total short-term investments |  | $ | 202,136 |  |  | $ | 3 |  |  | $ | (66 | ) |  | $ | 202,073 |
Total cash and cash equivalents and investments |  | $ | 339,402 |  |  | $ | 3 |  |  | $ | (66 | ) |  | $ | 339,339 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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