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Cash, Money Market Funds and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash, Money Market Funds and Marketable Securities |
Schedule of cash and available for sale securities | Cash and available for sale securities consisted of the following as of December 31, 2017 and December 31, 2016 (in thousands):
|  | As of December 31, 2017 |
|  | Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value |
Cash balances |  | $ | 49,060 |  | $ | — |  | $ | — |  | $ | 49,060 |
Corporate debt securities, current portion |  |  | 199,314 |  |  | 1 |  |  | (303 | ) |  | 199,012 |
Commercial paper |  |  | 79,878 |  |  | — |  |  | (75 | ) |  | 79,803 |
Asset-backed securities |  |  | 30,346 |  |  | — |  |  | (59 | ) |  | 30,287 |
Money market |  |  | 350 |  |  | — |  |  | — |  |  | 350 |
Certificate of deposit |  |  | 50 |  |  | — |  |  | — |  |  | 50 |
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|  | $ | 358,998 |  | $ | 1 |  | $ | (437 | ) | $ | 358,562 |
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Included in cash and cash equivalents |  | $ | 49,060 |  | $ | — |  | $ | — |  | $ | 49,060 |
Included in marketable securities |  |  | 309,938 |  |  | 1 |  |  | (437 | ) |  | 309,502 |
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Total cash and marketable securities |  | $ | 358,998 |  | $ | 1 |  | $ | (437 | ) | $ | 358,562 |
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|  | As of December 31, 2016 |
|  | Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value |
Cash balances |  | $ | 187,026 |  | $ | — |  | $ | — |  | $ | 187,026 |
Corporate debt securities, current portion |  |  | 74,564 |  |  | 2 |  |  | (31 | ) |  | 74,535 |
Commercial paper |  |  | 68,258 |  |  | 132 |  |  | — |  |  | 68,390 |
Money market |  |  | 350 |  |  | — |  |  | — |  |  | 350 |
Certificate of deposit |  |  | 50 |  |  | — |  |  | — |  |  | 50 |
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|  | $ | 330,248 |  | $ | 134 |  | $ | (31 | ) | $ | 330,351 |
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Included in cash and cash equivalents |  | $ | 187,026 |  | $ | — |  | $ | — |  | $ | 187,026 |
Included in marketable securities |  |  | 143,222 |  |  | 134 |  |  | (31 | ) |  | 143,325 |
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Total cash and marketable securities |  | $ | 330,248 |  | $ | 134 |  | $ | (31 | ) | $ | 330,351 |
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