Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan - Textual (Details)

v3.7.0.1
Equity Incentive Plan - Textual (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net proceeds from issuance of stock $ 13,657,331 $ 0
Employee stock option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (in shares) 142,725  
Options exercised (in shares) 26,743  
Equity Incentive 2013 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share of common stock available for issuance under the Plan (in shares) 533,253  
Unrecognized compensation cost related to non-vested share-based compensation arrangement $ 2,487,487  
Weighted average period for recognition 2 years  
Equity Incentive 2013 Plan | Employee stock option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Value of options granted $ 262,070  
Compensation expense associated with grants $ 38,924  
Options exercised (in shares) 26,743  
Net proceeds from issuance of stock $ 11,143  
Equity Incentive 2013 Plan | Director    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (in shares) 83,625  
Equity Incentive 2013 Plan | Employees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (in shares) 59,100