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Marketable Securities | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Note 5 – Marketable Securities Marketable securities classified as available-for-sale as of March 31, 2019 and December 31, 2018 were comprised of (in thousands):
|  | March 31, 2019 |  |  | December 31, 2018 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Asset-backed securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 4,999 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 4,997 |
Corporate debt securities |  |  | 2,484 |  |  |  | — |  |  |  | — |  |  |  | 2,484 |  |  |  | 16,986 |  |  |  | — |  |  |  | (3 | ) |  |  | 16,983 |
Total |  | $ | 2,484 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,484 |  |  | $ | 21,985 |  |  | $ | — |  |  | $ | (5 | ) |  | $ | 21,980 |
Marketable Securities – Unrealized Losses The primary objective of the Company’s investment policy is the preservation of capital; thus, the Company’s investment policy limits investments to certain types of instruments with high-grade credit ratings, places restrictions on maturities and concentrations in certain industries and requires the Company to maintain a certain level of liquidity.

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