Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Stock-based compensation - Stock-Based Compensation (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation $ 138,329 $ 117,065
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 2,250,536