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Marketable Securities
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The following tables summarize the Company's marketable debt securities (in thousands):
March 31, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. Treasury securities$128,231 $— $(274)$127,957 
Government-sponsored enterprises7,705 — (5)7,700 
Corporate debt securities1,004 — (3)1,001 
Total$136,940 $— $(282)$136,658 
December 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. Treasury securities$81,184 $— $(52)$81,132 
Government-sponsored enterprises7,739 — (5)7,734 
Corporate debt securities31,285 — (4)31,281 
Total$120,208 $— $(61)$120,147 

All available-for-sale marketable debt securities held as of March 31, 2022 and December 31, 2021 had contractual maturities of less than one year. All of the Company's available-for-sale marketable debt securities in an unrealized loss position as of March 31, 2022 and December 31, 2021 were in a loss position for less than twelve months.  Unrealized losses on
available-for-sale debt securities as of March 31, 2022 and December 31, 2021 were not significant and were primarily due to changes in interest rates, including market credit spreads, and not due to increased credit risks associated with specific securities. Accordingly, no allowance for credit losses related to the Company's available-for-sale debt securities was recorded for any periods presented. The Company does not intend to sell these investments and it is not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be at maturity.