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Cash Equivalents and Short Term Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Cash Equivalents And Short Term Investments [Abstract]  
Schedule of short-term investments
 
 
Face
Value
$
 
 
Original Cost
$
 
 
Accrued Interest
$
 
 
Carrying
Value
$
 
 
Fair
Value
$
 
Effective
Interest Rate
%
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Short-term investments
—
 
—
 
—
 
—
 
—
 
—%
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Short-term investments
2,088,800
 
2,088,800
 
—
 
2,088,800
 
2,088,800
 
1.41%