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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | 3. MARKETABLE SECURITIES As of December 31, 2019, the Company did not hold any 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 |

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