Quarterly report pursuant to sections 13 or 15(d)

Goodwill - Additional Information (Detail)

v2.4.0.8
Goodwill - Additional Information (Detail) (USD $)
12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
LED Replacement Lamps and Fixtures
Dec. 31, 2012
LED Replacement Lamps and Fixtures
Dec. 31, 2011
LED Singnage and Lighting Strips
Finite-Lived Intangible Assets [Line Items]        
Impairment charge $ 1,988,920 $ 1,988,920 $ 1,988,920 $ 407,369