Annual report pursuant to section 13 and 15(d)

Impairment Charges for Other Intangible Assets (Detail)

v2.4.0.6
Impairment Charges for Other Intangible Assets (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Patents
Dec. 31, 2011
Patents
Dec. 31, 2012
Trademarks
Dec. 31, 2011
Trademarks
Dec. 31, 2012
Product Certification And Licensing Costs
Dec. 31, 2011
Product Certification And Licensing Costs
Dec. 31, 2012
LED Replacement Lamps and Fixtures
Dec. 31, 2012
LED Replacement Lamps and Fixtures
Patents
Dec. 31, 2012
LED Replacement Lamps and Fixtures
Trademarks
Dec. 31, 2012
LED Replacement Lamps and Fixtures
Product Certification And Licensing Costs
Finite-Lived Intangible Assets [Line Items]                        
Gross Carrying Amount $ 12,925,921 $ 3,423,459 $ 267,904 $ 1,286,437 $ 4,314,000 $ 908,998 $ 61,017 $ 158,024 $ 1,227,613 $ 1,073,188 $ 28,998 $ 125,427
Accumulated Amortization (873,045) (879,490) (106,725) (197,803) (249,803) (192,461) (29,534) (63,893) (212,478) (138,851) (3,509) (70,118)
Net Carrying Amount Prior to Impairment                 1,015,135 934,337 25,489 55,309
Impairment Recognized                 (1,015,135) (934,337) (25,489) (55,309)
Net Carrying Amount at December 31, 2012 $ 12,052,876 $ 2,543,969 $ 161,179 $ 1,088,634 $ 4,064,197 $ 716,537 $ 31,483 $ 94,131