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Investments
 12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Investments
Investments
Investments consist of mutual funds and municipal bonds at December 31, 2013 and of certificates of deposit, mutual funds, and municipal bonds at December 31, 2012. The Company classifies all investments as available-for-sale, as the sale of such investments may be required prior to maturity to implement management strategies. These investments are carried at fair value, with the unrealized gains and losses reported as a component of accumulated other comprehensive loss in the consolidated statements of stockholders’ equity until realized. Realized gains and losses from the sale of investments, if any, are determined on a specific identification basis. Realized gains and losses and declines in value judged to be other-than-temporary, if any, on available-for-sale investments are included as a component of interest and other income, net, in the consolidated statements of operations. During the year ended December 31, 2013, net realized loss on investments of $39,000 was recorded. No such impairment charges were recorded during the years ended December 31, 2012 or 2011. Interest on investments classified as available-for-sale are included in interest and other income, net, in the consolidated statements of operations.
The following is a summary of short-tem investments as of December 31, 2013 and 2012:
 
 
 
 
As of December 31, 2013
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
18,178,518

 
$
—

 
$
(78,614
)
 
$
18,099,904

Municipal bonds
Less than 1
 
805,144

 
560

 
—

 
805,704

Total investments
 
 
$
18,983,662

 
$
560

 
$
(78,614
)
 
$
18,905,608

 
 
 
As of December 31, 2012
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
7,500,063

 
$
83,868

 
$
—

 
$
7,583,931

Certificates of deposit
Less than 1
 
250,000

 
—

 
—

 
250,000

Municipal bonds
Less than 1
 
201,470

 
—

 
(1,400
)
 
200,070

Total investments
 
 
$
7,951,533

 
$
83,868

 
$
(1,400
)
 
$
8,034,001