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Warrants (Tables)
3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Schedule of Warrants Issued and Outstanding
As of March 31, 2015 the following warrants for common stock were issued and outstanding:
Issue date
 
Expiration date
 
Exercise price
 
Number of warrants outstanding
April 4, 2011
 
April 4, 2016
 
$
6.74

 
1,384,647

November 21, 2012
 
November 21, 2017
 
$
7.86

 
1,067,792

 
 
 
 
 
 
2,452,439