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Marketable Securities
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
Marketable securities as of December 31, 2020 and 2019 consisted of the following:
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 
 
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 $135 and $480 for the years ended December 31, 2020 and 2019, respectively.