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Marketable Securities
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable SecuritiesThe following is a summary of the Company’s available-for-sale marketable securities as of December 31, 2020, which all have contractual maturities of less than two years:
(in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Market
Value
U.S. Treasury and government agencies$165,966 $129 $(3)$166,092 
Corporate debt140,538 87 (8)140,617 
Total marketable securities$306,504 $216 $(11)$306,709 
The following is a summary of the Company’s available-for-sale marketable securities as of December 31, 2019, which all have contractual maturities of less than two years:
(in thousands)Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Market
Value
U.S. Treasury and government agencies$88,535 $68 $(2)$88,601 
Corporate debt129,860 196 (1)130,055 
Asset-backed securities48,355 49 (3)48,401 
Total marketable securities$266,750 $313 $(6)$267,057