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MARKETABLE SECURITIES | 9 Months Ended
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Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | 3. MARKETABLE SECURITIES
| September 30, 2020
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Government debt | $ | 50,987 |  |  | $ | — |  |  | $ | (11) |  |  | $ | 50,976 |
Corporate debt | 136,045 |  |  | 1 |  |  | (212) |  |  | 135,834 |
| $ | 187,032 |  |  | $ | 1 |  |  | $ | (223) |  |  | $ | 186,810 |
As of September 30, 2020, maturities of marketable securities ranged from October 2020 to September 2023, with a weighted-average remaining maturity of approximately 1.3 years. As of December 31, 2019, the Company did not hold any marketable securities.

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