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Cash, Cash Equivalents and Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Cash and Cash Equivalents [Abstract] |
Schedule of Securities Classified as Cash and Cash Equivalents and Short-term Investments | Securities classified as cash and cash equivalents and short-term investments as of December 31, 2016 and December 31, 2015 are summarized below (in thousands). Estimated fair value is based on quoted market prices for these investments.
|  | December 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized |  |  | Fair Value |
|  |  | Gains |  |  | Losses |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 3,638 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,638 |
Money market funds |  |  | 68,561 |  |  |  | — |  |  |  | — |  |  |  | 68,561 |
Commercial paper |  |  | 2,399 |  |  |  | — |  |  |  | — |  |  |  | 2,399 |
Total cash and cash equivalents |  | $ | 74,598 |  |  | $ | — |  |  | $ | — |  |  | $ | 74,598 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 58,464 |  |  |  | 2 |  |  |  | (56 | ) |  | $ | 58,410 |
Commercial paper |  |  | 62,946 |  |  |  | 5 |  |  |  | (20 | ) |  |  | 62,931 |
Asset-backed securities |  |  | 4,886 |  |  |  | — |  |  |  | (2 | ) |  |  | 4,884 |
Total short-term investments |  | $ | 126,296 |  |  | $ | 7 |  |  | $ | (78 | ) |  | $ | 126,225 |
Total |  | $ | 200,894 |  |  | $ | 7 |  |  | $ | (78 | ) |  | $ | 200,823 |
|  | December 31, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized |  |  | Fair Value |
|  |  | Gains |  |  | Losses |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 25,194 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,194 |
Money market funds |  |  | 81,810 |  |  |  | — |  |  |  | — |  |  |  | 81,810 |
Total cash and cash equivalents |  | $ | 107,004 |  |  | $ | — |  |  | $ | — |  |  | $ | 107,004 |

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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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