Annual report pursuant to Section 13 and 15(d)

Stockholders' equity - Stock Option Activity (Details)

v2.4.0.6
Stockholders' equity - Stock Option Activity (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Tecogen
      
Stock Options Outstanding [Roll Forward]      
Beginning (shares) 4,381,000 2,480,000  
Granted (shares) 70,000 2,046,000  
Exercised (shares) 0 0  
Canceled and forfeited (shares) (63,750) 0  
Repurchased (shares)   (50,000)  
Expired (shares) (1,250) (95,000)  
Ending (shares) 4,386,000 4,381,000 2,480,000
Exercisable (shares) 2,650,250 1,673,750  
Vested and expected to vest (shares) 4,386,000 4,381,000  
Weighted Average Exercise Price [Roll Forward]      
Beginning (usd per share) $ 0.48 $ 0.32  
Granted (usd per share) $ 0.80 $ 0.65  
Exercised (usd per share) $ 0.00 $ 0.00  
Canceled and forfeited (usd per share) $ 0.32 $ 0.00  
Repurchased (usd per share)   $ 0.25  
Expired (usd per share) $ 0.65 $ 0.37  
Ending (usd per share) $ 0.49 $ 0.48 $ 0.32
Exercisable (usd per share) $ 0.39 $ 0.31  
Vested and expected to vest (usd per share) $ 0.49 $ 0.48  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Outstanding, Weighted Average Remaining Life 4 years 7 months 28 days 5 years 6 months 11 days 3 years 3 months 18 days
Outstanding, Aggregate Intrinsic Value $ 1,356,400 $ 1,387,150 $ 793,500
Exercisable, Aggregate Intrinsic Value 1,096,225 815,125  
Vested and expected to vest, Aggregate Intrinsic Value 1,356,400 1,387,150  
Exercise Price Per Share [Abstract]      
Outstanding, Exercise Price Lower Range Limit (usd per share) $ 0.03 $ 0.03 $ 0.03
Outstanding, Exercise Price Upper Range Limit (usd per share) $ 0.80 $ 0.70 $ 0.50
Granted, Exercise Price (usd per share) $ 0.80    
Granted, Exercise Price Lower Range Limit (usd per share)   $ 0.65  
Granted, Exercise Price Upper Range Limit (usd per share)   $ 0.70  
Exercised, Exercise Price (usd per share) $ 0 $ 0  
Canceled and Forfeited, Exercise Price (usd per share)   $ 0  
Canceled and Forfeited, Exercise Price Lower Range Limit (usd per share) $ 0.30    
Canceled and Forfeited, Exercise Price Upper Range Limit (usd per share) $ 0.65    
Repurchased, Exercise Price (usd per share)   $ 0.25  
Expired, Exercise Price (usd per share) $ 0.65    
Expired, Excercise Price Per Share, Lower Range Limit (usd per share)   $ 0.30  
Expired, Excercise Price Per Share, Upper Range Limit (usd per share)   $ 0.65  
Ilois
      
Stock Options Outstanding [Roll Forward]      
Beginning (shares) 525,000 300,000  
Granted (shares) 50,000 225,000  
Exercised (shares) 0 0  
Canceled and forfeited (shares) 0 0  
Expired (shares) 0 0  
Ending (shares) 575,000 525,000 300,000
Exercisable (shares) 0 0  
Vested and expected to vest (shares) 575,000 525,000  
Weighted Average Exercise Price [Roll Forward]      
Beginning (usd per share) $ 0.27 $ 0.10  
Granted (usd per share) $ 0.50 $ 0.50  
Exercised (usd per share) $ 0.00 $ 0.00  
Canceled and forfeited (usd per share) $ 0.00 $ 0.00  
Expired (usd per share) $ 0.00 $ 0.00  
Ending (usd per share) $ 0.29 $ 0.27 $ 0.10
Exercisable (usd per share) $ 0.50 $ 0.00  
Vested and expected to vest (usd per share) $ 0.29 $ 0.27  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Outstanding, Weighted Average Remaining Life 7 years 5 months 9 days 8 years 2 months 23 days 9 years 4 months 2 days
Outstanding, Aggregate Intrinsic Value 120,000 120,000 120,000
Exercisable, Aggregate Intrinsic Value 0 0  
Vested and expected to vest, Aggregate Intrinsic Value $ 120,000 $ 120,000  
Exercise Price Per Share [Abstract]      
Outstanding, Exercise Price (usd per share)     $ 0.10
Outstanding, Exercise Price Lower Range Limit (usd per share) $ 0.10 $ 0.10  
Outstanding, Exercise Price Upper Range Limit (usd per share) $ 0.50 $ 0.50  
Granted, Exercise Price (usd per share) $ 0.50 $ 0.50  
Exercised, Exercise Price (usd per share) $ 0 $ 0  
Canceled and Forfeited, Exercise Price (usd per share) $ 0 $ 0  
Expired, Exercise Price (usd per share) $ 0 $ 0