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Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale 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