Summary of Significant Accounting Policies - Narrative (Details) ft² in Thousands, $ in Thousands			3 Months Ended
	Jun. 30, 2016 USD ($) ft²	Mar. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Accounts receivable are due, minimum period (days)			30 days
Accounts receivable are due, maximum period (days)			60 days
Depreciation			$ 389	$ 786
Amortization			$ 243	$ 351
Intangible assets, estimated economic useful life (years)			6 years 25 days
Power purchase agreement product revenue is recognized term (years)			10 years
High Intensity Fluorescent Lighting Products
Segment Reporting Information [Line Items]
Limited warranty term (years)			1 year
Minimum
Segment Reporting Information [Line Items]
Length of time of inventory usage considered for inventory reserve (months)			9 months
Maximum
Segment Reporting Information [Line Items]
Length of time of inventory usage considered for inventory reserve (months)			24 months
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