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Available-for-Sale Investments (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Debt Securities, Available-for-sale
The following table represents the Company’s available-for-sale investments by major security type as of December 31, 2019 and 2018 (in thousands):
 
 
December 31, 2019
 
 
Amortized
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized Losses
 
Total
Fair Value
 
 
 
 
 
 
 
 
 
Investments:
 
 
 
 
 
 
 
 
     Commercial paper
 
$
14,922

 
$
—

 
$
—

 
$
14,922

     Corporate securities
 
22,146

 
20

 
(2
)
 
22,164

     U.S. government securities
 
32,152

 
23

 
—

 
32,175

        Total available-for-sale investments
 
$
69,220

 
$
43

 
$
(2
)
 
$
69,261

 
 
 
 
 
 
 
 
 
 
 
December 31, 2018
 
 
Amortized
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized Losses
 
Total
Fair Value
 
 
 
 
 
 
 
 
 
Investments:
 
 
 
 
 
 
 
 
     Agency securities
 
$
11,944

 
$
—

 
$
(13
)
 
$
11,931

     Commercial paper
 
1,183

 
—

 
—

 
1,183

     Corporate securities
 
15,081

 
—

 
(15
)
 
15,066

     U.S. government securities
 
38,761

 
—

 
(24
)
 
38,737

        Total available-for-sale investments
 
$
66,969

 
$
—

 
$
(52
)
 
$
66,917