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Marketable Securities
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
Available-for-sale marketable securities as of December 31, 2019 and 2018 were as follows (in thousands):
December 31, 2019
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Government-sponsored enterprises$13,216  $6  $—  $13,222  
Corporate debt securities76,052  20  (10) 76,062  
Total$89,268  $26  $(10) $89,284  

December 31, 2018
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair
Value
Corporate debt securities$12,738  $—  $(3) $12,735  
All of the Company's available-for-sale securities held at December 31, 2019 and 2018 had maturity dates of less than one year.
All available-for-sale securities in an unrealized loss position as of December 31, 2019 and 2018 were in a loss position for less than twelve months. There were no unrealized losses at December 31, 2019 or 2018 that the Company determined to be other-than-temporary. The Company recorded interest income of $3.4 million, $2.3 million and $2.4 million during the years ended December 31, 2019, 2018 and 2017, respectively, which is included in Other income (expense) on the consolidated statements of operations and comprehensive loss.