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 ($)
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation $ 88,177 $ 51,497
Tecogen    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (shares) 87,701  
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 1,676,957  
Tecogen | 2009 Plan | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (shares) 82,701  
Ilois | 2009 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares remaining available for future issuance 1,325,000  
Maximum number of shares allowable for issuance 2,000,000