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Investments (Tables)
 3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of investments
The following is a summary of available-for-sale securities as of March 31, 2019 and December 31, 2018:

 
 
 
As of March 31, 2019
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
106,483,816

 
$
539,170

 
$
(31,229
)
 
$
106,991,757

US corporate debt securities
Less than 2
 
224,578

 
376

 
(213
)
 
224,741

Total investments
 
 
$
106,708,394

 
$
539,546

 
$
(31,442
)
 
$
107,216,498

 
 
 
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