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Marketable Securities | 9 Months Ended
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Sep. 30, 2016
Investments [Abstract] |
Marketable Securities | Note 5 – Marketable Securities Marketable securities classified as available-for-sale as of September 30, 2016 and December 31, 2015 were comprised of (in thousands):
|  | September 30, 2016 |  | December 31, 2015 |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
U.S. Treasury securities |  | $ | 15,066 |  | $ | 12 |  | $ | — |  | $ | 15,078 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |
Asset-backed securities |  |  | 43,152 |  |  | 1 |  |  | (2) |  |  | 43,151 |  |  | 20,748 |  |  | — |  |  | (9) |  |  | 20,739 |
Corporate debt securities |  |  | 121,966 |  |  | 156 |  |  | (16) |  |  | 122,106 |  |  | 116,821 |  |  | 29 |  |  | (41) |  |  | 116,809 |
Total |  | $ | 180,184 |  | $ | 169 |  | $ | (18) |  | $ | 180,335 |  | $ | 137,569 |  | $ | 29 |  | $ | (50) |  | $ | 137,548 |
Marketable Securities – Unrealized Losses The primary objective of the Company’s investment policy is the preservation of capital; limiting investments to certain types of instruments with high-grade credit ratings, restricting maturities and concentrations in certain industries and requiring the Company to maintain a certain level of liquidity. The Company owned 42 available-for-sale securities as of September 30, 2016. Of these 42 securities, 14 had combined unrealized losses of less than $0.1 million as of September 30, 2016. The Company did not have any investments in a loss position for greater than 12 months as of September 30, 2016. The Company has evaluated its marketable securities and has determined that none of these investments have an other-than-temporary impairment, as it has no intent to sell securities with unrealized losses and it is not more likely than not that the Company will be required to sell any securities with unrealized losses, given the Company’s current and anticipated financial position.

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