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Cash and Cash Equivalents and Investments (Tables) | 12 Months Ended
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Dec. 31, 2013
Cash and Cash Equivalents and Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments |
| As of December 31, 2013
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  | (in thousands) |  |
Cash and cash equivalents | $ | 37,499 |  |  | $ | — |  |  | $ | — |  |  | $ | 37,499 |
Securities maturing within one year: |  |  |  |  |  |  |
Certificates of deposit | 552 |  |  | — |  |  | — |  |  | 552 |
U.S. treasury securities | 91,075 |  |  | 3 |  |  | (1 | ) |  | 91,077 |
Total short-term investments | $ | 91,627 |  |  | $ | 3 |  |  | $ | (1 | ) |  | $ | 91,629 |
Total cash and cash equivalents and investments | $ | 129,126 |  |  | $ | 3 |  |  | $ | (1 | ) |  | $ | 129,128 |
| As of December 31, 2012
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  | (in thousands) |  |
Cash and cash equivalents | $ | 30,423 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,423 |
Securities maturing within one year: |  |  |  |  |  |  |
Certificates of deposit | 551 |  |  | — |  |  | — |  |  | 551 |
U.S. treasury securities | 192,211 |  |  | 24 |  |  | (1 | ) |  | 192,234 |
Total short-term investments | $ | 192,762 |  |  | $ | 24 |  |  | $ | (1 | ) |  | $ | 192,785 |
Total cash and cash equivalents and investments | $ | 223,185 |  |  | $ | 24 |  |  | $ | (1 | ) |  | $ | 223,208 |

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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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