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Cash and Cash Equivalents and Investments (Tables) | 12 Months Ended
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Dec. 31, 2015
Cash and Cash Equivalents and Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments |
| As of December 31, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  | (in thousands) |  |
Cash and cash equivalents | $ | 202,989 |  |  | $ | — |  |  | $ | — |  |  | $ | 202,989 |
Securities maturing within one year: |  |  |  |  |  |  |
U.S. treasury securities | 313,105 |  |  | 2 |  |  | (219 | ) |  | 312,888 |
Corporate debt securities | 5,477 |  |  | — |  |  | (2 | ) |  | 5,475 |
Total short-term investments | $ | 318,582 |  |  | $ | 2 |  |  | $ | (221 | ) |  | $ | 318,363 |
Total cash and cash equivalents and investments | $ | 521,571 |  |  | $ | 2 |  |  | $ | (221 | ) |  | $ | 521,352 |
| 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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