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Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale securities
Marketable securities as of December 31, 2021 and 2020 consisted of the following:
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 
 
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