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Stockholders' Equity (Details 4) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding 8,926,517   4,865,234
Number of Shares, Outstanding and vested     8,926,517
Warrant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding 1,785,303 8,628,911 973,046
Number of Shares, Granted 7,017,251 173,643 812,257
Number of Shares, Exercised   (2,040,278)  
Number of Shares, Forfeited (173,643) (1,400,094)  
Number of Shares, Outstanding and vested 8,628,911 5,362,183 1,785,303
Weighted Average Exercise Price Per Share, Outstanding $ 2.70 $ 6.40 $ 2.41
Weighted Average Exercise Price Per Share, Granted 7.35 4.00 2.49
Weighted Average Exercise Price Per Share, Exercised   7.50  
Weighted Average Exercise Price Per Share, Forfeited 4.00 7.50  
Weighted Average Exercise Price Per Share, Outstanding and vested $ 6.40 $ 5.60 $ 2.70