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Marketable Securities
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The following is a summary of the Company’s available-for-sale marketable securities as of December 31, 2019, which all have contractual maturities of less than two years:
(in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Market
Value
U.S. Treasury and government agencies
$
88,535

 
$
68

 
$
(2
)
 
$
88,601

Corporate debt
129,860

 
196

 
(1
)
 
130,055

Asset-backed securities
48,355

 
49

 
(3
)
 
48,401

Total marketable securities
$
266,750


$
313


$
(6
)

$
267,057

The following is a summary of the Company’s available-for-sale marketable securities as of December 31, 2018, which all have contract maturities of less than one year:
(in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Market
Value
U.S. Treasury and government agencies
$
69,275

 
$
12

 
$
(17
)
 
$
69,270

Corporate debt
105,897

 
38

 
(25
)
 
105,910

Asset-backed securities
21,189

 
—

 
(14
)
 
21,175

Total marketable securities, current
$
196,361


$
50


$
(56
)

$
196,355