Summary of Significant Accounting Policies - Narrative (Details) ft² in Thousands, $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) ft²	Mar. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Accounts receivable are due, minimum period (days)					30 days
Accounts receivable are due, maximum period (days)					60 days
Depreciation			$ 366	$ 766	$ 755	$ 1,561
Amortization			$ 239	$ 353	$ 482	$ 704
Intangible assets, estimated economic useful life (years)					6 years 2 months 5 days
Power purchase agreement product revenue is recognized term (years)					10 years
Minimum
Segment Reporting Information [Line Items]
Length of time of inventory usage considered for inventory reserve (months)					9 months
Minimum | High Intensity Fluorescent Lighting Products
Segment Reporting Information [Line Items]
Limited warranty term (years)					1 year
Maximum
Segment Reporting Information [Line Items]
Length of time of inventory usage considered for inventory reserve (months)					24 months
Maximum | High Intensity Fluorescent Lighting Products
Segment Reporting Information [Line Items]
Limited warranty term (years)					10 years
Agreement with Tramontina U.S. Cookware, Inc.
Segment Reporting Information [Line Items]
Cash purchase price of sale leaseback	$ 2,600	$ 2,600
Area of leased building (sqft) | ft²	197
Building lease term	3 years