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

 
 
 
As of September 30, 2017
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
73,416,881

 
$
203,203

 
$
(198,767
)
 
$
73,421,317

US corporate debt securities
Less than 2
 
45,261,392

 
7,887

 
(78,995
)
 
45,190,284

Investment in affiliated entity (PLS)
---
 
—

 
2,720,045

 
—

 
2,720,045

Total investments
 
 
$
118,678,273

 
$
2,931,135

 
$
(277,762
)
 
$
121,331,646

 
 
 
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