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Marketable Securities
 12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities
 
The Company’s marketable securities consist of available-for-sale securities, which are carried at fair value, with unrealized gains and losses reported as a separate component of stockholders’ equity. Unrealized gains and losses are computed on the specific identification method. Realized gains, realized losses and declines in value judged to be other-than-temporary, are included in interest and other income (loss), net. The cost of available-for-sale securities sold is based on the specific identification method and interest earned is included in interest and other income.
 
The cost and fair values of the Company’s available-for-sale marketable securities as of December 31, 2014, were as follows: 


Aggregate
Fair Value
 
Cost or Amortized
Cost
 
Net Unrealized
Losses
Government securities

$
6,740,825


$
6,741,466


$
(641
)
Corporate debt securities

4,159,897


4,160,664


(767
)
 

$
10,900,722


$
10,902,130


$
(1,408
)
 
The cost and fair values of the Company’s available-for-sale marketable securities as of December 31, 2013, were as follows: 


Aggregate
Fair Value
 
Cost or Amortized
Cost
 
Net Unrealized
Gains
Government securities

$
6,252,339


$
6,249,483


$
2,856

Corporate debt securities

1,820,769


1,820,215


554

 

$
8,073,108


$
8,069,698


$
3,410


 
The cost and fair values of available-for-sale securities by contractual maturity as of December 31, 2014, were as follows: 
 

Fair Value
 
Cost
Due within one year

$
7,803,639


$
7,803,190

Due after one year

3,097,083


3,098,940

 

$
10,900,722


$
10,902,130