Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation (Narrative) (Details)

v3.3.0.814
Stock-based compensation (Narrative) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
May. 18, 2015
board_member
$ / shares
shares
Oct. 31, 2013
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation         $ 666,853 $ 326,753
Number of board members receiving grants | board_member 4          
Closing stock price (in dollars per share) | $ / shares $ 4.95          
Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation     $ 0   $ 160,000  
Options granted in period (in shares) | 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         1,702,578  
2013 Plan | Stock Options            
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     162,850 $ 159,385 $ 506,853 $ 326,753
Unrecognized compensation cost related to unvested stock-based awards     $ 3,733,014   $ 3,733,014  
Unrecognized compensation cost, recognition period         4 years 7 months 24 days  
Options granted, weighted-average grant date fair value | $ / shares         $ 1.86