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Cash and Cash Equivalents and Investments (Tables) | 3 Months Ended
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Mar. 31, 2017
Cash and Cash Equivalents and Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block] |
|  | As of March 31, 2017
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  | (in thousands)
Cash and cash equivalents |  | $ | 2,455 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,455 |
Securities maturing within one year: |  |  |  |  |  |  |  |
U.S. treasury securities |  | 191,443 |  |  | — |  |  | (195 | ) |  | 191,248 |
Corporate debt securities |  | 66,109 |  |  | — |  |  | (69 | ) |  | 66,040 |
Total short-term investments |  | $ | 257,552 |  |  | $ | — |  |  | $ | (264 | ) |  | $ | 257,288 |
Total cash and cash equivalents and investments |  | $ | 260,007 |  |  | $ | — |  |  | $ | (264 | ) |  | $ | 259,743 |
|  | As of December 31, 2016
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  |  |  | (in thousands) |  |
Cash and cash equivalents |  | $ | 46,600 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,600 |
Securities maturing within one year: |  |  |  |  |  |  |  |
U.S. treasury securities |  | 227,911 |  |  | 1 |  |  | (107 | ) |  | 227,805 |
Corporate debt securities |  | 72,188 |  |  | 1 |  |  | (90 | ) |  | 72,099 |
Total short-term investments |  | $ | 300,099 |  |  | $ | 2 |  |  | $ | (197 | ) |  | $ | 299,904 |
Total cash and cash equivalents and investments |  | $ | 346,699 |  |  | $ | 2 |  |  | $ | (197 | ) |  | $ | 346,504 |

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- Definition Cash and Cash Equivalents and Investments [Abstract] + References No definition available. + Details
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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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