Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation (Narrative) (Details)

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Stock-based compensation (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended
May. 18, 2015
board_member
$ / shares
shares
Oct. 31, 2013
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation         $ 504,400 $ 167,368
Number of board members receiving grants | board_member 4          
Closing stock price (in dollars per share) | $ / shares $ 4.95          
Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation     $ 160,000   $ 160,000  
Options granted in period | shares 8,080          
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted shares excluded from calculation of dilutive earnings per share | shares         2,024,078  
Stock Options | 2013 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Authorized shares | shares   4,773,992        
Contractual term   10 years        
Option vesting period   5 years        
Stock-based compensation     166,000 $ 95,000 $ 344,000 $ 167,000
Unrecognized compensation cost related to unvested stock-based awards     $ 4,008,160   $ 4,008,160  
Unrecognized compensation cost, recognition period         4 years 7 months 24 days  
Options granted, weighted-average grant date fair value | $ / shares         $ 1.87