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Cash, Cash Equivalents and Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Cash, Cash Equivalents and Investments |
Schedule of Securities Classified as Cash, Cash Equivalents and Short-term Investments | Securities classified as cash, cash equivalents and short-term investments as of June 30, 2018 and December 31, 2017, are summarized below (in thousands). Estimated fair value is based on quoted market prices for these investments.
|  | June 30, 2018
|  |  |  | Gross Unrealized |  |  |
|  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 2,932 |  |  | — |  |  | — |  | $ | 2,932
Money market funds |  |  | 67,611 |  |  | — |  |  | — |  |  | 67,611
Corporate bonds |  |  | 2,664 |  |  |  |  |  | — |  |  | 2,664
Commercial paper |  |  | 18,544 |  |  | — |  |  | — |  |  | 18,544
Total cash and cash equivalents |  | $ | 91,751 |  | $ | — |  | $ | — |  | $ | 91,751
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  |  | 8,459 |  |  | 1 |  |  | — |  |  | 8,460
Corporate bonds |  |  | 38,788 |  |  | — |  |  | (31) |  |  | 38,757
Commercial paper |  |  | 64,642 |  |  | — |  |  | (2) |  |  | 64,640
Asset-backed securities |  |  | 9,126 |  |  | — |  |  | (3) |  |  | 9,123
Total short-term investments |  | $ | 121,015 |  | $ | 1 |  | $ | (36) |  | $ | 120,980
Total cash equivalents and investments |  | $ | 212,766 |  | $ | 1 |  | $ | (36) |  | $ | 212,731
|  | December 31, 2017
|  |  |  | Gross Unrealized |  |  |
|  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 5,882 |  | $ | — |  | $ | — |  | $ | 5,882
Money market funds |  |  | 68,651 |  |  | — |  |  | — |  |  | 68,651
Commercial paper |  |  | 850 |  |  | — |  |  | — |  |  | 850
Total cash equivalents and investments |  | $ | 75,383 |  | $ | — |  | $ | — |  | $ | 75,383
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 3,994 |  |  | — |  |  | (1) |  | $ | 3,993
Corporate bonds |  |  | 26,853 |  |  | — |  |  | (26) |  |  | 26,827
Commercial paper |  |  | 19,584 |  |  | — |  |  | (14) |  |  | 19,570
Asset-backed securities |  |  | 8,209 |  |  | — |  |  | (6) |  |  | 8,203
Total short-term investments |  | $ | 58,640 |  | $ | — |  | $ | (47) |  | $ | 58,593
Total cash equivalents and investments |  | $ | 134,023 |  | $ | — |  | $ | (47) |  | $ | 133,976

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