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Marketable Securities
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The following tables summarize the Company's marketable debt and equity securities (in thousands):
September 30, 2020
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. Treasury securities$60,003 $2 $— $60,005 
Government-sponsored enterprises14,006 1 — 14,007 
Corporate debt securities5,010 — — 5,010 
Total$79,019 $3 $— $79,022 
December 31, 2019
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Government-sponsored enterprises$13,216 $6 $— $13,222 
Corporate debt securities76,052 20 (10)76,062 
Total$89,268 $26 $(10)$89,284 
All available-for-sale marketable debt securities held as of September 30, 2020 and December 31, 2019 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 September 30, 2020 and December 31, 2019 were in a loss position for less than 12 months.  Unrealized losses on available-for-sale debt securities as of September 30, 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 the nine months ended September 30, 2020. 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. No losses related to other-than-temporary impairments of our available-for-sale debt securities were recorded in Accumulated other comprehensive income during the year ended December 31, 2019