Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Stock-based compensation - Stock-Based Compensation (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Recognized stock-based compensation $ 72,587 $ (38,131)
Compensation cost related to unvested restricted stock awards and stock option awards not yet recognized $ 242,435  
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 1,968,558  
Ilois
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 2 months 27 days  
Ilois | 2009 Plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum number of shares allowable for issuance 2,000,000