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Marketable Securities
 3 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
Marketable securities as of March 31, 2020 and December 31, 2019 consisted of the following:
March 31, 2020Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Money market mutual funds$22,487  $—  $—  $22,487  
Total marketable securities designated as available-for-sale$22,487  $—  $—  $22,487  
 
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 $113 and less than $1 during the three months ended March 31, 2020 and 2019, respectively.