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Marketable Securities
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities
The Company has classified its marketable securities as available-for-sale securities. These securities are carried at estimated fair value with unrealized holding gains and losses included in accumulated other comprehensive income/loss in stockholders' equity until realized. Gains and losses on marketable security transactions are reported on the specific-identification method. Dividend and interest income are recognized when earned.

The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at September 30, 2015 and December 31, 2014 were as follows:

 
Amortized
cost
 
Gross
unrealized
holding
gains
 
Gross
unrealized
holding
losses
 
Estimated
fair value
September 30, 2015
 
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
$
21,317

 
$
91

 
$
(72
)
 
$
21,336

 
 
Municipal bonds
5,668

 
33

 
(1
)
 
5,700

 
Total available-for-sale securities
$
26,985

 
$
124

 
$
(73
)
 
$
27,036


 
Amortized
cost
 
Gross
unrealized
holding
gains
 
Gross
unrealized
holding
losses
 
Estimated
fair value
December 31, 2014
 
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
$
19,804

 
$
89

 
$
(55
)
 
$
19,838

 
 
Municipal bonds
6,292

 
28

 
(2
)
 
6,318

 
Total available-for-sale securities
$
26,096

 
$
117

 
$
(57
)
 
$
26,156



Maturities of marketable securities classified as available-for-sale securities were as follows at September 30, 2015:

 
Amortized
cost
 
Estimated
fair value
September 30, 2015
 
 
 
 
     Due within one year
$
6,609

 
$
6,602

 
     Due after one year through five years
19,959

 
20,017

 
     Due after five years through ten years
417

 
417

 
Total available-for-sale securities
$
26,985

 
$
27,036

Debt securities in an unrealized loss position as of September 30, 2015 were not deemed impaired at acquisition and subsequent declines in fair value are not deemed attributed to declines in credit quality. Management believes that it is more likely than not that the securities will receive a full recovery of par value. The following table summarizes the fair value and gross unrealized losses of the Company’s investments with unrealized losses, aggregated by type of investment instrument and length of time that individual securities have been in a continuous unrealized loss position, as of September 30, 2015:
 
Less than 12 months
 
More than 12 months
 
Total
(In thousands)
Estimated
fair value
 
Gross
unrealized
holding
losses
 
Estimated
fair value
 
Gross
unrealized
holding
losses
 
Estimated
fair value
 
Gross
unrealized
holding
losses
As of September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
$
5,137

 
$
(26
)
 
$
2,462

 
$
(45
)
 
$
7,599

 
$
(71
)
Municipal bonds
201

 
(1
)
 
229

 
(1
)
 
430

 
(2
)
 
 
 
 
 
 
 
 
 
 
 
 
 
$
5,338

 
$
(27
)
 
$
2,691

 
$
(46
)
 
$
8,029

 
$
(73
)