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 $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Recognized stock-based compensation $ 170,550 $ (38,131)
Compensation cost related to unvested restricted stock awards and stock option awards not yet recognized   $ 164,294
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   2 years 11 months 8 days
Tecogen | Amended Plan | Stock options
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares of common stock reserved for future issuance   1,838,750
Number of shares remaining available for future issuance   97,683
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   2 years 11 months 8 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