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Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary of investments
The following is a summary of available-for-sale securities as of December 31, 2017 and 2016:
 
 
 
 
As of December 31, 2017
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
68,776,165

 
$
42,097

 
$
(252,373
)
 
$
68,565,889

US corporate debt securities
Less than 2
 
35,210,121

 
3,032

 
(140,198
)
 
35,072,955

Investment in affiliated entity (PLS)
---
 
—

 
2,325,079

 
—

 
2,325,079

Total investments
 
 
$
103,986,286

 
$
2,370,208

 
$
(392,571
)
 
$
105,963,923

 
 
 
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