Summary of Significant Accounting Policies - Additional Information (Detail)			1 Months Ended	3 Months Ended	9 Months Ended
	Dec. 01, 2014 shares	Apr. 17, 2014 shares	Aug. 31, 2014 USD ($)	Sep. 30, 2014 USD ($) shares	Sep. 30, 2015 USD ($) Segment shares	Sep. 30, 2014 USD ($) shares	Oct. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments | Segment					1
Cash and cash equivalents				$ 2,398,000	$ 882,000	$ 2,398,000			$ 6,033,000	$ 1,757,000
Cash flow from operations					17,804,000	15,697,000
Working capital					24,000,000				$ 18,800,000
Line of credit facility, maximum borrowing amount			$ 25,000,000
Borrowing capacity					22,900,000
Debt instrument agreement period			3 years
Guaranteed borrowing capacity								$ 5,000,000
Bank loan payable					2,100,000
Convertible stock, Conversion of preferred stock | shares	36,300,171
Revenue from sales taxes					$ 3,000,000	$ 1,500,000
Maturity of temporary cash investments					3 months
Business acquisition, number of shares to be issued | shares					4,926,004
Anti-dilutive shares | shares				27,200,000		27,200,000
Scenario, Previously Reported
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments | Segment					2
Subsequent Event
Summary Of Significant Accounting Policies [Line Items]
Line of credit facility, maximum borrowing amount							$ 30,000,000
Value Lighting
Summary Of Significant Accounting Policies [Line Items]
Net deferred tax liabilities					$ 5,500,000
Business acquisition, number of shares to be issued | shares		8,468,192
Minimum
Summary Of Significant Accounting Policies [Line Items]
Product warranty					1 year
Intangible assets estimate useful life					1 year
Maximum
Summary Of Significant Accounting Policies [Line Items]
Product warranty					10 years
Intangible assets estimate useful life					17 years 6 months
Contingent payment of stock issued for acquisitions of businesses					$ 6,200,000