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Marketable Securities
 3 Months Ended
Mar. 31, 2022
Marketable Securities [Abstract]  
Marketable Securities Marketable Securities
Marketable securities as of March 31, 2022 and December 31, 2021 consisted of the following:
March 31, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Money market mutual funds$8,649 $— $— $8,649 
Total marketable securities designated as available-for-sale$8,649 $— $— $8,649 
 
December 31, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Money market mutual funds$13,147 $— $— $13,147 
Total marketable securities designated as available-for-sale$13,147 $— $— $13,147 

Interest income from marketable securities was $1 and $2 during the three months ended March 31, 2022 and 2021, respectively.