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Cash and Investments (Tables) | 9 Months Ended
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Sep. 30, 2017
Investments Debt And Equity Securities [Abstract] |
Cash, Cash Equivalents and Available-for-Sale Investments | The following tables present cash, cash equivalents, and available-for-sale investments as of the following dates (in thousands):
|  | September 30, 2017 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 38,235 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,235 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 812 |  |  |  | — |  |  |  | — |  |  |  | 812 |
Commercial paper and corporate debt securities |  |  | 4,994 |  |  |  | — |  |  |  | — |  |  |  | 4,994 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 501 |  |  |  | — |  |  |  | — |  |  |  | 501 |
U.S. Government agency securities |  |  | 2,001 |  |  |  | — |  |  |  | (5 | ) |  |  | 1,996 |
Certificate of deposits |  |  | 23,298 |  |  |  | — |  |  |  | — |  |  |  | 23,298 |
Commercial paper |  |  | 17,907 |  |  |  | 3 |  |  |  | — |  |  |  | 17,910 |
Corporate debt securities |  |  | 45,701 |  |  |  | — |  |  |  | (4 | ) |  |  | 45,697 |
Asset-backed securities |  |  | 6,916 |  |  |  | — |  |  |  | (2 | ) |  |  | 6,914 |
Total cash, cash equivalents, and marketable securities |  | $ | 140,365 |  |  | $ | 3 |  |  | $ | (11 | ) |  | $ | 140,357 |
|  | December 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 43,604 |  |  | $ | — |  |  | $ | — |  |  | $ | 43,604 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 959 |  |  |  | — |  |  |  | — |  |  |  | 959 |
Commercial paper and corporate debt securities |  |  | 2,499 |  |  |  | — |  |  |  | — |  |  |  | 2,499 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  | 5,667 |  |  |  | — |  |  |  | — |  |  |  | 5,667 |
U.S. Government agency securities |  |  | 11,412 |  |  |  | — |  |  |  | (7 | ) |  |  | 11,405 |
Certificates of deposits |  |  | 23,000 |  |  |  | 19 |  |  |  | — |  |  |  | 23,019 |
Commercial paper |  |  | 22,402 |  |  |  | — |  |  |  | — |  |  |  | 22,402 |
Corporate debt securities |  |  | 14,194 |  |  |  | — |  |  |  | (6 | ) |  |  | 14,188 |
Municipal securities |  |  | 756 |  |  |  | — |  |  |  | (1 | ) |  |  | 755 |
Asset-backed securities |  |  | 5,466 |  |  |  | — |  |  |  | (3 | ) |  |  | 5,463 |
Total cash, cash equivalents, and marketable securities |  | $ | 129,959 |  |  | $ | 19 |  |  | $ | (17 | ) |  | $ | 129,961 |

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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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