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Marketable Securities
 9 Months Ended
Sep. 30, 2020
Marketable Securities [Abstract]  
Marketable Securities Marketable Securities
Marketable securities as of September 30, 2020 and December 31, 2019 consisted of the following:
September 30, 2020Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Money market mutual funds$7,507 $— $— $7,507 
United States treasuries14,996 — (1)14,995 
Total marketable securities designated as available-for-sale$22,503 $— $(1)$22,502 
 
December 31, 2019Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Money market mutual funds$29,907 $— $— $29,907 
Total marketable securities designated as available-for-sale$29,907 $— $— $29,907 

The effective maturity date of the United States treasuries is less than one year.

Interest income from marketable securities was $5 and $267 during the three months ended September 30, 2020 and 2019, respectively, and $132 and $299 during the nine months ended September 30, 2020 and 2019, respectively.