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Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Additional information for warrants outstanding
The table below provides additional information for warrants outstanding as of December 31, 2017.
 
Number of
warrants
 
Weighted
average
exercise price
 
Expiration date
Outstanding at December 31, 2016
639,598

 
$
0.86

 
Various from
January 2017 through
March 2017
Exercised
(416,295
)
 
0.86

 
 
Expired
(223,303
)
 
0.86

 
 
Outstanding and Exercisable at December 31, 2017

 
$