Quarterly report pursuant to Section 13 or 15(d)

Derivative liability (Details)

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Derivative liability (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 16, 2013
Oct. 16, 2013
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Fair Value Measurements [Line Items]              
Fair value of derivative liability [1]     $ 3,463,000   $ 3,463,000   $ 6,241,000
Trading market values [2]         $ 4.19   $ 4.85
Term (years) [3]         7 months 29 days   1 year 58 days
Expected volatility [2]         37.00%   26.80%
Risk-free rate [3]         0.15%   0.32%
Discount rate [1]         1.01%   1.18%
Effective Exercise price $ 5.00 $ 5.00 $ 5.00 [3]   $ 5.00 [3]   $ 5.00 [3]
Trigger price $ 6.25       $ 6.25 [3]   $ 6.25 [3]
Expected months until effective registration [1]              
Derivative expense     $ 3,392,000 $ 2,832,711 $ 2,778,000 $ 2,784,711  
The One Group              
Fair Value Measurements [Line Items]              
Additional payments to TOG Members $ 14,100,000 $ 14,100,000          
Shares required for additional payments to TOG Members   5,750,000          
Exercise price of warrants (in dollars per share) $ 5.00 $ 5.00          
Aggregate contingent sign-on bonus $ 900,000 $ 900,000          
Minimum price per share per agreement (in dollars per share) $ 6.25 $ 6.25          
Threshold number of days above minimum stock price during measurement period 20 days            
Number of days in measurement period 30 days            
Fair value of derivative liability $ 15,000,000 $ 15,000,000          
[1] (3)Level 3 inputs are unobservable inputs. Inputs for which any parts are level 3 inputs are classified as level 3 in their entirety.
[2] (1)Level 1 inputs are quoted prices in active markets for identical assets and liabilities, or derived therefrom.
[3] (2)Level 2 inputs are inputs other than quoted prices that are observable.