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Investments (Tables)
 3 Months Ended
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Summary of investments
The following is a summary of short-term investments as of March 31, 2015 and December 31, 2014:
 
 
 
 
As of March 31, 2015
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
30,487,759

 
$
4,285

 
$
(175,677
)
 
$
30,316,367

US corporate debt securities
Less than 2
 
24,570,334

 
2,713

 
(22,844
)
 
24,550,203

Total investments
 
 
$
55,058,093

 
$
6,998

 
$
(198,521
)
 
$
54,866,570

 
 
 
As of December 31, 2014
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
29,487,758

 
$
2,667

 
$
(216,790
)
 
$
29,273,635

US corporate debt securities
Less than 2
 
23,839,606

 
70

 
(37,337
)
 
23,802,339

Total investments
 
 
$
53,327,364

 
$
2,737

 
$
(254,127
)
 
$
53,075,974