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MARKETABLE SECURITIES
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
MARKETABLE SECURITIES
3. MARKETABLE SECURITIES
December 31, 2020
(in thousands)Amortized CostUnrealized GainsUnrealized LossesFair Value
Government debt$39,996 $— $(8)$39,988 
Corporate debt253,345 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.