|
Changes in Carrying Amount of Goodwill (Detail) (USD $)
|
12 Months Ended | 3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Jun. 30, 2012
LED Replacement Lamps and Fixtures
|
Dec. 31, 2013
LED Replacement Lamps and Fixtures
|
Dec. 31, 2012
LED Replacement Lamps and Fixtures
|
Dec. 31, 2011
LED Signage and Lighting Strips
|
Dec. 31, 2013
LED Signage and Lighting Strips
|
|
| Goodwill [Line Items] | |||||||
| Goodwill, Beginning Balance | $ 10,166,000 | $ 1,989,000 | $ 10,166,000 | $ 1,989,000 | |||
| Business acquisition | 10,903,000 | 10,166,000 | 10,903,000 | 10,166,000 | |||
| Impairment loss | (1,989,000) | (1,989,000) | (1,989,000) | (407,000) | |||
| Goodwill, Ending Balance | 21,069,000 | 10,166,000 | 21,069,000 | 10,166,000 | |||
| Goodwill | 23,465,000 | 23,058,000 | 407,000 | ||||
| Accumulated impairment losses | $ (2,396,000) | $ (1,989,000) | $ (407,000) | ||||
| X | ||||||||||
|
- Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|