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Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Summary of investments
The following is a summary of available-for-sale securities as of June 30, 2018 and December 31, 2017:

 
 
 
As of June 30, 2018
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
69,855,486

 
$
—

 
$
(532,970
)
 
$
69,322,516

US corporate debt securities
Less than 2
 
11,252,264

 
—

 
(65,416
)
 
11,186,848

Investment in affiliated entity (PLS)
---
 
—

 
2,667,805

 
—

 
2,667,805

Total investments
 
 
$
81,107,750

 
$
2,667,805

 
$
(598,386
)
 
$
83,177,169

 
 
 
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