General form of registration statement for all companies including face-amount certificate companies

Stock-based compensation - Restricted Stock Activity (Details)

v2.4.0.8
Stock-based compensation - Restricted Stock Activity (Details) (Restricted stock, USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Tecogen
       
Unvested Restricted Stock [Roll Forward]        
Unvested, Beginning (shares) 399,070 483,317 433,317 414,106
Granted (shares) 0 0 50,000 19,211
Vested (shares) 0 0 0 0
Forfeited (shares) (37,500) (84,247) 0 0
Unvested, Ending (shares) 361,570 399,070 483,317 433,317
Weighted Average Grant Date Fair Value [Roll Forward]        
Unvested, Beginning (usd per share) $ 1.44 $ 1.44 $ 1.28 $ 1.24
Granted (usd per share) $ 0 $ 0 $ 2.60 $ 2.60
Vested (usd per share) $ 0 $ 0 $ 0 $ 0
Forfeited (usd per share) $ 2.60 $ 1.36 $ 0 $ 0
Unvested, Ending (usd per share) $ 1.31 $ 1.44 $ 1.44 $ 1.28
Ilois
       
Unvested Restricted Stock [Roll Forward]        
Unvested, Beginning (shares) 510,000 560,000 360,000 360,000
Granted (shares) 0 0 200,000 0
Vested (shares) 0 0 0 0
Forfeited (shares) (200,000) (50,000) 0 0
Unvested, Ending (shares) 310,000 510,000 560,000 360,000
Weighted Average Grant Date Fair Value [Roll Forward]        
Unvested, Beginning (usd per share) $ 0.26 $ 0.24 $ 0.10 $ 0.10
Granted (usd per share) $ 0 $ 0 $ 0.50 $ 0
Vested (usd per share) $ 0 $ 0 $ 0 $ 0
Forfeited (usd per share) $ 0.50 $ 0.10 $ 0 $ 0
Unvested, Ending (usd per share) $ 0.10 $ 0.26 $ 0.24 $ 0.10