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Investments (Tables)
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Summary of investments
The following is a summary of available-for-sale securities as of September 30, 2015 and December 31, 2014:

 
 
 
As of September 30, 2015
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
58,633,654

 
$
—

 
$
(398,320
)
 
$
58,235,334

US corporate debt securities
Less than 2
 
26,993,900

 
6,052

 
(24,873
)
 
26,975,079

Municipal bonds
Less than 1
 
103,156

 
—

 
(13
)
 
103,143

Investment in affiliated entity (PLS)
---
 
—

 
7,130,768

 
—

 
7,130,768

Total investments
 
 
$
85,730,710

 
$
7,136,820

 
$
(423,206
)
 
$
92,444,324

 
 
 
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