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Investments (Tables)
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary of investments
The following is a summary of available-for-sale securities as of June 30, 2017 and December 31, 2016:

 
 
 
As of June 30, 2017
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
43,085,855

 
$
194,051

 
$
(212,400
)
 
$
43,067,506

US corporate debt securities
Less than 2
 
25,118,191

 
6,967

 
(54,045
)
 
25,071,113

Investment in affiliated entity (PLS)
---
 
—

 
3,339,802

 
—

 
3,339,802

Total investments
 
 
$
68,204,046

 
$
3,540,820

 
$
(266,445
)
 
$
71,478,421

 
 
 
As of December 31, 2016
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
60,883,065

 
$
94,374

 
$
(387,693
)
 
$
60,589,746

US corporate debt securities
Less than 2
 
25,098,122

 
6,853

 
(65,309
)
 
25,039,666

Investment in affiliated entity (PLS)
---
 
—

 
3,777,510

 
—

 
3,777,510

Total investments
 
 
$
85,981,187

 
$
3,878,737

 
$
(453,002
)
 
$
89,406,922