Financial Information Relating to Operating Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenues from external customers	$ 26,877	$ 5,313	$ 49,344	$ 18,982
Segment income (loss)	371	(1,543)	(3,593)	(1,968)
Corporate expenses	(1,116)	(1,513)	(3,799)	(5,297)
Change in fair value of embedded derivative				(6,990)
Interest expense	(192)	(24)	(651)	(24)
Deferred income tax (provision) benefit	(496)		5,468
Other income	29		11	746
Loss from continuing operations	(1,404)	(3,080)	(2,564)	(13,533)
Segment depreciation and amortization	1,742	526	3,845	2,571
Corporate depreciation and amortization	8	6	13	17
Total depreciation and amortization	1,750	532	3,858	2,588
Asset	115,489		115,489		52,237
Reportable Segment
Segment Reporting Information [Line Items]
Asset	114,750		114,750		57,513
Elimination of intercompany receivables
Segment Reporting Information [Line Items]
Asset	(75)		(75)		(14,231)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Asset	814		814		8,955
Lighting Fixtures and Lamps
Segment Reporting Information [Line Items]
Total revenues from external customers	25,457	4,447	45,664	16,413
Segment income (loss)	227	(1,554)	(3,499)	(1,886)
Segment depreciation and amortization	1,663	470	3,608	2,400
Asset	109,336		109,336		50,553
Lighting Signage and Media
Segment Reporting Information [Line Items]
Total revenues from external customers	1,420	866	3,680	2,569
Segment income (loss)	144	11	(94)	(82)
Segment depreciation and amortization	79	56	237	171
Asset	$ 5,414		$ 5,414		$ 6,960