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Investments (Tables)
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of available-for-sale securities
The following is a summary of available-for-sale securities as of June 30, 2019 and December 31, 2018:

 
 
 
As of June 30, 2019
 
Contractual
Maturity (in years)
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair Market Value
Mutual funds
---
 
$
85,168,756

 
$
1,067,059

 
$
—

 
$
86,235,815

 
 
 
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