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Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2020
Marketable Securities [Abstract]  
Marketable Securities
Marketable securities as of September 30, 2020 and December 31, 2019 consisted of the following:
September 30, 2020Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Money market mutual funds$7,507 $— $— $7,507 
United States treasuries14,996 — (1)14,995 
Total marketable securities designated as available-for-sale$22,503 $— $(1)$22,502 
 
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