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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Summary of investments
The following is a summary of available-for-sale securities as of December 31, 2018 and 2017:
 
 
 
 
As of December 31, 2018
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
57,842,955

 
$
—

 
$
(528,084
)
 
$
57,314,871

US corporate debt securities
Less than 2
 
224,633

 
—

 
(652
)
 
223,981

Total investments
 
 
$
58,067,588

 
$
—

 
$
(528,736
)
 
$
57,538,852

 
 
 
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