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Marketable Securities
 9 Months Ended
Sep. 30, 2021
Marketable Securities [Abstract]  
Marketable Securities Marketable Securities
Marketable securities as of September 30, 2021 and December 31, 2020 consisted of the following:
September 30, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Money market mutual funds$17,146 $— $— $17,146 
Total marketable securities designated as available-for-sale$17,146 $— $— $17,146 
 
December 31, 2020Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Money market mutual funds$20,142 $— $— $20,142 
United States treasuries4,999 — — 4,999 
Total marketable securities designated as available-for-sale$25,141 $— $— $25,141 

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

Interest income from marketable securities was $1 and $5 during the three months ended September 30, 2021 and 2020, respectively, and $5 and $132 during the nine months ended September 30, 2021 and 2020, respectively.