Annual report pursuant to section 13 and 15(d)

Inventories - Additional Information (Detail)

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Inventories - Additional Information (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Inventory [Line Items]        
Reserve for obsolete inventory $ 1,254,000 $ 1,669,000 $ 895,000 $ 271,000
LED Replacement Lamps and Fixtures
        
Schedule Of Inventory [Line Items]        
Reserve for obsolete inventory $ 387,000