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

 
 
 
As of March 31, 2018
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
54,509,756

 
$
—

 
$
(306,308
)
 
$
54,203,448

US corporate debt securities
Less than 2
 
21,211,005

 
—

 
(154,564
)
 
21,056,441

Investment in affiliated entity (PLS)
---
 
—

 
3,307,192

 
—

 
3,307,192

Total investments
 
 
$
75,720,761

 
$
3,307,192

 
$
(460,872
)
 
$
78,567,081

 
 
 
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