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Warrant Liability (Restated) (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Warrant liability [Line Items]    
Opening Balance, Number of Warrants 9,097,430 9,097,430
Change in fair value to the date of cashless exercise charged to income statement, Number of Warrants 1,279,647  
Fair value of exercised warrants credited to shareholders equity, Number of Warrants 1,279,647  
Change in fair value of unexercised warrants remaining, Average Value 7,817,783  
Closing Balance, Number of Warrants 7,817,783 7,817,783
Opening Balance, Average Value $ 3.44 $ 2.20
Change in fair value to the date of cashless exercise charged to income statement, Average Value 2.03  
Fair value of exercised warrants credited to shareholders equity, Average Value 5.47  
Change in fair value of unexercised warrants remaining , Average Value 0.97  
Closing balance, Average Value $ 4.41 $ 4.41
Beginning Balance $ 31,304 $ 19,991
Change in fair value to the date of cashless exercise charged to income statement, Fair Value 2,600 (4,212)
Fair value of exercised warrants credited to shareholders equity, Fair Value (7,003)  
Change in fair value of unexercised warrants remaining , Fair Value 7,548  
Ending Balance 34,450 $ 34,450
Total change in warrant liability due exercise of warrants and change in fair value of remaining warrants, Fair Value $ 3,145