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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule for Available-for-Sale Securities
The following is a summary of available-for-sale securities as of March 31, 2019 (in thousands):
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized (Losses)
 
Estimated Fair Value
Corporate debt securities
$
46,685

 
$
95

 
$
(89
)
 
$
46,691

Tax-exempt municipal securities
18,969

 
83

 
(9
)
 
19,043

Variable rate demand notes
1,600

 
—

 
—

 
1,600

Commercial paper
1,018

 
—

 
—

 
1,018

Total
$
68,272

 
$
178

 
$
(98
)
 
$
68,352


The following is a summary of available-for-sale securities as of December 31, 2018 (in thousands):
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized (Losses)
 
Estimated Fair Value
Corporate debt securities
$
48,202

 
$
12

 
$
(284
)
 
$
47,930

Tax-exempt municipal securities
22,858

 
45

 
(34
)
 
22,869

Variable rate demand notes
4,000

 
—

 
—

 
4,000

Total
$
75,060

 
$
57

 
$
(318
)
 
$
74,799
Schedule of Maturities of Marketable Securities
The following table summarizes the maturities of the Company’s marketable securities as of December 31, 2018 and March 31, 2019 (in thousands):
 
December 31, 2018
 
March 31, 2019
Due within one year
$
37,121

 
$
36,486

Due after one year through five years
37,678

 
31,866

Total
$
74,799

 
$
68,352