Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation (Narrative) (Details)

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Stock-based compensation (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Feb. 28, 2014
Jun. 30, 2014
Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Issuance of stock-based compensation       $ 167,368
Stock Options [Member]
       
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Authorized shares 4,773,992   4,773,992 4,773,992
Issuance of stock-based compensation     95,177 167,368
Expected life in years     6 years 6 months  
Dividend rate     0.00%  
Risk free interest rate     1.41%  
Volatility     32.00%  
Options granted, weighted-average grant date fair value     $ 1.85  
Exercise price $ 4.85 $ 6.00    
Option vesting period 5 years      
Vesting rate   50.00%    
Option vesting terms   50% will vest based on the achievement of targeted annual milestones which have been set by the board of directors.    
Unrecognized compensation cost related to unvested stock-based awards $ 4,250,021   $ 4,250,021 $ 4,250,021
Unrecognized compensation cost, recognition period       4 years 10 months 24 days