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Cash and Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
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):
|  | June 30, 2018 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 70,657 |  |  | $ | — |  |  | $ | — |  |  | $ | 70,657 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 9,563 |  |  |  | — |  |  |  | — |  |  |  | 9,563 |
Commerical paper and Certificates of deposit |  |  | 5,980 |  |  |  | — |  |  |  | — |  |  |  | 5,980 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency securities |  |  | 1,500 |  |  |  | — |  |  |  | (1 | ) |  |  | 1,499 |
Certificates of deposit |  |  | 8,999 |  |  |  | 1 |  |  |  | — |  |  |  | 9,000 |
Commercial paper |  |  | 4,974 |  |  |  | — |  |  |  | — |  |  |  | 4,974 |
Corporate debt securities |  |  | 36,807 |  |  |  | — |  |  |  | (130 | ) |  |  | 36,677 |
Asset-backed securities |  |  | 10,383 |  |  |  | — |  |  |  | (31 | ) |  |  | 10,352 |
Total cash, cash equivalents, and marketable securities |  | $ | 148,863 |  |  | $ | 1 |  |  | $ | (162 | ) |  | $ | 148,702 |
|  | December 30, 2017 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Market Value |
Cash |  | $ | 34,643 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,643 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 256 |  |  |  | — |  |  |  | — |  |  |  | 256 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency securities |  |  | 1,500 |  |  |  | — |  |  |  | (5 | ) |  |  | 1,495 |
Certificates of deposits |  |  | 14,498 |  |  |  | — |  |  |  | (1 | ) |  |  | 14,497 |
Commercial paper |  |  | 7,952 |  |  |  | — |  |  |  | (3 | ) |  |  | 7,949 |
Corporate debt securities |  |  | 48,073 |  |  |  | — |  |  |  | (105 | ) |  |  | 47,968 |
Asset-backed securities |  |  | 10,240 |  |  |  | — |  |  |  | (19 | ) |  |  | 10,221 |
Total cash, cash equivalents, and marketable securities |  | $ | 117,162 |  |  | $ | — |  |  | $ | (133 | ) |  | $ | 117,029 |

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