Quarterly report pursuant to sections 13 or 15(d)

Goodwill - Additional Information (Detail)

v2.4.0.6
Goodwill - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Impairment charge   $ 1,988,920  
LED Replacement Lamps and Fixtures
     
Finite-Lived Intangible Assets [Line Items]      
Impairment charge $ 1,988,920 $ 1,988,920 $ 407,369