Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation - Restricted Stock Activity (Details)

v2.4.0.8
Stock-based compensation - Restricted Stock Activity (Details) (Restricted stock, USD $)
3 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Tecogen
   
Unvested Restricted Stock [Roll Forward]    
Unvested, Beginning (shares)   399,070
Granted (shares) 0  
Vested (shares) 0  
Forfeited (shares) 37,500  
Unvested, Ending (shares) 361,570 399,070
Weighted Average Grant Date Fair Value [Roll Forward]    
Unvested, Beginning (usd per share)   $ 1.44
Granted (usd per share) $ 0.00  
Vested (usd per share) $ 0  
Forfeited (usd per share) $ 2.60  
Unvested, Ending (usd per share) $ 1.31 $ 1.44
Ilois
   
Unvested Restricted Stock [Roll Forward]    
Unvested, Beginning (shares)   510,000
Granted (shares) 0  
Vested (shares) 0  
Forfeited (shares) 200,000  
Unvested, Ending (shares) 310,000 510,000
Weighted Average Grant Date Fair Value [Roll Forward]    
Unvested, Beginning (usd per share)   $ 0.26
Granted (usd per share) $ 0.00  
Vested (usd per share) $ 0.00  
Forfeited (usd per share) $ 0.50  
Unvested, Ending (usd per share) $ 0.10 $ 0.26