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Marketable Securities
 6 Months Ended
Jun. 30, 2020
Marketable Securities [Abstract]  
Marketable Securities Marketable Securities
Marketable securities as of June 30, 2020 and December 31, 2019 consisted of the following:
June 30, 2020Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Money market mutual funds$22,498  $—  $—  $22,498  
Total marketable securities designated as available-for-sale$22,498  $—  $—  $22,498  
 
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  

Interest income from marketable securities was $14 and $32 during the three months ended June 30, 2020 and 2019, respectively, and $127 and $32 during the six months ended June 30, 2020 and 2019, respectively.