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Investments (Tables)
6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
The following table sets forth the composition of short-term investments as of December 31, 2016.

 
December 31, 2016
 
 
 
 
 
Unrealized
 
 
 
Maturity in Years
 
Cost
 
Gains
 
Losses
 
Fair Value
Corporate debt securities
Less than 1 year
 
$
14,165,915

 
$
44

 
$
(5,273
)
 
$
14,160,686

Commercial paper
Less than 1 year
 
1,195,444

 

 

 
1,195,444

U.S. treasury securities
Less than 1 year
 
8,625,728

 
330

 
(4,166
)
 
8,621,892

Total Investment
 
 
$
23,987,087

 
$
374

 
$
(9,439
)
 
$
23,978,022