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Marketable Securities
 3 Months Ended
Mar. 31, 2021
Marketable Securities [Abstract]  
Marketable Securities Marketable Securities
Marketable securities as of March 31, 2021 and December 31, 2020 consisted of the following:
March 31, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Money market mutual funds$25,143 $— $— $25,143 
Total marketable securities designated as available-for-sale$25,143 $— $— $25,143 
 
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 $2 and $113 during the three months ended March 31, 2021 and 2020, respectively