Annual report pursuant to section 13 and 15(d)

Intangible Assets - Additional Information (Detail)

v2.4.0.6
Intangible Assets - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Other intangible assets $ 18,643  
Intangible asset amortization expense 266,034 287,838
Patents
   
Goodwill [Line Items]    
Finite lived intangible assets useful lives 12 years  
Intangible asset amortization expense 108,625 122,798
Trademarks
   
Goodwill [Line Items]    
Finite lived intangible assets useful lives 17 years  
Intangible asset amortization expense 108,625 122,798
Customer Relationships
   
Goodwill [Line Items]    
Finite lived intangible assets useful lives 10 years  
Intangible asset amortization expense 116,650 101,000
Other Intangible Assets
   
Goodwill [Line Items]    
Intangible asset amortization expense 40,759 64,040
Other Intangible Assets | Minimum
   
Goodwill [Line Items]    
Finite lived intangible assets useful lives 1 year  
Other Intangible Assets | Maximum
   
Goodwill [Line Items]    
Finite lived intangible assets useful lives 17 years  
LED Replacement Lamps and Fixtures
   
Goodwill [Line Items]    
Other intangible assets 996,492  
Property and equipment $ 393,157