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Cash and Cash Equivalents and Investments (Tables) | 9 Months Ended
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Sep. 30, 2014
Cash and Cash Equivalents and Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block] |
|  | As of September 30, 2014
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
|  | (in thousands)
Cash and cash equivalents |  | $ | 26,775 |  |  | $ | — |  |  | $ | — |  |  | $ | 26,775 |
Securities maturing within one year: |  |  |  |  |  |  |  |
Certificates of deposit |  | 552 |  |  | — |  |  | — |  |  | 552 |
U.S. treasury securities |  | 30,540 |  |  | 2 |  |  | — |  |  | 30,542 |
Total short-term investments |  | $ | 31,092 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 31,094 |
Total cash and cash equivalents and investments |  | $ | 57,867 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 57,869 |
|  | 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 |

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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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