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Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Marketable Securities
The following tables summarize the Company's marketable debt securities (in thousands):
September 30, 2021
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
U.S. Treasury securities$68,019 $$(4)$68,017 
Government-sponsored enterprises12,278 — 12,279 
Corporate debt securities28,074 — (3)28,071 
Total$108,371 $$(7)$108,367 
December 31, 2020
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
U.S. Treasury securities$60,630 $$(7)$60,624 
Corporate debt securities30,777 (3)30,776 
Total$91,407 $$(10)$91,400