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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Summary of investments
The following is a summary of available-for-sale securities as of December 31, 2015 and 2014:
 
 
 
 
As of December 31, 2015
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
78,571,294

 
$
435

 
$
(185,737
)
 
$
78,385,992

US corporate debt securities
Less than 2
 
26,923,855

 
—

 
(54,452
)
 
26,869,403

Municipal bonds
Less than 1
 
101,936

 
—

 
(54
)
 
101,882

Investemnt in affiliated entity - PLS
---
 
—

 
5,045,915

 
—

 
5,045,915

Total investments
 
 
$
105,597,085

 
$
5,046,350

 
$
(240,243
)
 
$
110,403,192

 
 
 
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