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Warrants liability (Details) (USD $)
5 Months Ended 6 Months Ended
Nov. 29, 2013
Dec. 31, 2013
Warrants Liability [Line Items]    
Annual dividend yield $ 0 $ 0
Exercised price $ 5.38 $ 5.38
Underlying price at grant date $ 3.86 $ 3.86
Expected life (years) 3 years 3 years
Risk-free interest rate 0.56% 0.78%
Expected volatility 272.00% 272.00%