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Stock Purchase Warrants (Details 2) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Warrants, Beginning Balance 7,974,794 1,632,501
Number of Warrants, Granted 0 7,029,808
Number of Warrants, Exercised 0 (232,619)
Number of Warrants, Forfeited (61,207) (454,896)
Number of Warrants, Ending Balance 7,913,587 7,974,794
Weighted Average Exercise Price, Beginning Balance $ 1.80 $ 1.99
Weighted Average Exercise Price, Granted 0 1.75
Weighted Average Exercise Price, Exercised 0 1.47
Weighted Average Exercise Price, Forfeited 3.30 1.88
Weighted Average Exercise Price, Ending Balance $ 1.79 $ 1.80