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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | 3. MARKETABLE SECURITIES
(in thousands) | December 31, 2018
Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Municipal bonds | $ | 44,802 |  |  | $ | 13 |  |  | $ | (110 | ) |  | $ | 44,705 |
Corporate bonds | 48,499 |  |  | 23 |  |  | (226 | ) |  | 48,296 |
| $ | 93,301 |  |  | $ | 36 |  |  | $ | (336 | ) |  | $ | 93,001 |
(in thousands) | December 31, 2017
Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Municipal bonds | $ | 32,996 |  |  | $ | — |  |  | $ | (148 | ) |  | $ | 32,848 |
Corporate bonds | 28,757 |  |  | 1 |  |  | (137 | ) |  | 28,621 |
| $ | 61,753 |  |  | $ | 1 |  |  | $ | (285 | ) |  | $ | 61,469 |
As of December 31, 2018, the Company did not hold any investments with unrealized losses considered to be other than temporary. As of December 31, 2018, remaining maturities of marketable debt securities ranged from January 2019 to August 2021, with a weighted-average remaining maturity of approximately 1.4 years.

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