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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | 3. MARKETABLE SECURITIES
| December 31, 2020
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Government debt | $ | 39,996 |  |  | $ | — |  |  | $ | (8) |  |  | $ | 39,988 |
Corporate debt | 253,345 |  |  | 88 |  |  | (152) |  |  | 253,281 |
| $ | 293,341 |  |  | $ | 88 |  |  | $ | (160) |  |  | $ | 293,269 |
As of December 31, 2020, marketable securities maturities ranged from January 2021 to December 2023, with a weighted-average remaining maturity of 1.5 years. As of December 31, 2019, the Company did not hold any marketable securities.

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