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Cash, Money Market Funds and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 and December 31, 2015 (in thousands):
|  | 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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|  | As of December 31, 2015 |
|  | Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value |
Cash balances |  | $ | 69,485 |  | $ | — |  | $ | — |  | $ | 69,485 |
Corporate debt securities, current portion |  |  | 118,627 |  |  | 1 |  |  | (154 | ) |  | 118,474 |
Commercial paper |  |  | 25,686 |  |  | 38 |  |  | — |  |  | 25,724 |
Certificate of deposit |  |  | 350 |  |  | — |  |  | — |  |  | 350 |
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|  | $ | 214,148 |  | $ | 39 |  | $ | (154 | ) | $ | 214,033 |
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Included in cash and cash equivalents |  | $ | 69,485 |  | $ | — |  | $ | — |  | $ | 69,485 |
Included in marketable securities |  |  | 144,663 |  |  | 39 |  |  | (154 | ) |  | 144,548 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total cash and marketable securities |  | $ | 214,148 |  |  | 39 |  | $ | (154 | ) | $ | 214,033 |
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