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Changes in Carrying Amount of Goodwill (Detail) (USD $)
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3 Months Ended | 12 Months Ended | ||
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Mar. 31, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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| Goodwill [Line Items] | ||||
| Goodwill, Beginning Balance | $ 11,456,593 | $ 1,988,920 | ||
| Seesmart acquisition | (1,297,891) | 11,456,593 | ||
| Impairment loss | (1,988,920) | |||
| Goodwill, Ending Balance | 10,158,702 | 11,456,593 | ||
| Goodwill | 12,554,991 | |||
| Accumulated impairment losses | (2,396,289) | |||
| Goodwill, Ending Balance | 10,158,702 | 11,456,593 | ||
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LED Replacement Lamps and Fixtures
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| Goodwill [Line Items] | ||||
| Goodwill, Beginning Balance | 11,456,593 | 1,988,920 | ||
| Seesmart acquisition | (1,297,891) | 11,456,593 | ||
| Impairment loss | (1,988,920) | (1,988,920) | (407,369) | |
| Goodwill, Ending Balance | 10,158,702 | 11,456,593 | 1,988,920 | |
| Goodwill | 12,147,622 | |||
| Accumulated impairment losses | (1,988,920) | |||
| Goodwill, Ending Balance | 10,158,702 | 11,456,593 | 1,988,920 | |
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LED signage and lighting strips
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| Goodwill [Line Items] | ||||
| Goodwill | 407,369 | |||
| Accumulated impairment losses | $ (407,369) | |||
| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The accumulated impairment losses related to goodwill as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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