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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract] |
Schedule of Cash and Equivalents | Cash and cash equivalents consist of highly liquid investments with maturities of three months or less from the date of purchase. Cash and cash equivalents consist of the following at December 31 (in thousands):
|  | 2016 |  | 2015 |
Cash |  | $ | 17,481 |  | $ | 29,569 |
Money market funds |  |  | 95,896 |  |  | 14,950 |
Government-backed securities |  |  | 19,000 |  |  | 20,000 |
Asset-backed securities |  |  | — |  |  | 8,185 |
Corporate debt securities |  |  | 11,976 |  |  | 20,404 |
Cash and cash equivalents |  | $ | 144,353 |  | $ | 93,108 |

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