Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation - Stock-Based Compensation (Details)

v3.5.0.2
Stock-based compensation - Stock-Based Compensation (Details) - USD ($)
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation $ 117,065 $ 90,971
Tecogen    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (shares) 187,701  
Tecogen | Amended Plan | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares of common stock reserved for future issuance 3,838,750  
Number of shares remaining available for future issuance 1,627,357