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Marketable Securities
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The following tables summarize the Company's marketable debt securities (in thousands):
March 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. Treasury securities$79,775 $12 $— $79,787 
Government-sponsored enterprises$4,570 $— $— $4,570 
Corporate debt securities40,325 2 (3)40,324 
Total$124,670 $14 $(3)$124,681 

December 31, 2020
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. Treasury securities$60,630 $1 $(7)$60,624 
Corporate debt securities30,777 2 (3)30,776 
Total$91,407 $3 $(10)$91,400 
All available-for-sale marketable debt securities held as of March 31, 2021 and December 31, 2020 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, 2021 and December 31, 2020 were in a loss position for less than 12 months.  Unrealized losses on available-for-sale debt securities as of March 31, 2021 and December 31, 2020 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. We do not intend to sell these investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases, which may be at maturity.