Annual report pursuant to Section 13 and 15(d)

Stockholders' equity - Restricted Stock Activity (Details)

v2.4.0.8
Stockholders' equity - Restricted Stock Activity (Details) (Restricted stock, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Tecogen
   
Unvested Restricted Stock [Roll Forward]    
Unvested, Beginning (shares) 399,070 483,317
Granted (shares) 0 0
Vested (shares) 0 0
Forfeited (shares) (37,500) (84,247)
Unvested, Ending (shares) 361,570 399,070
Weighted Average Grant Date Fair Value [Roll Forward]    
Unvested, Beginning (usd per share) $ 1.44 $ 1.44
Granted (usd per share) $ 0.00 $ 0.00
Vested (usd per share) $ 0.00 $ 0.00
Forfeited (usd per share) $ 2.60 $ 1.36
Unvested, Ending (usd per share) $ 1.31 $ 1.44
Ilois
   
Unvested Restricted Stock [Roll Forward]    
Unvested, Beginning (shares) 510,000 560,000
Granted (shares) 0 0
Vested (shares) 0 0
Forfeited (shares) (200,000) (50,000)
Unvested, Ending (shares) 310,000 510,000
Weighted Average Grant Date Fair Value [Roll Forward]    
Unvested, Beginning (usd per share) $ 0.24 $ 0.24
Granted (usd per share) $ 0.00 $ 0.00
Vested (usd per share) $ 0.00 $ 0.00
Forfeited (usd per share) $ 0.50 $ 0.10
Unvested, Ending (usd per share) $ 0.10 $ 0.24