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Warrants - Summary of warrants (Details) (Warrant, USD $)
12 Months Ended
Dec. 31, 2013
Warrant
 
Class of Warrant or Right [Line Items]  
Exercise price (in dollars per share) $ 1.10
Term 7 years
Volatility 40.00%
Dividends 0.00%
Discount rate 0.05%