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Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenues	$ 18,507	$ 19,004	$ 31,852	$ 42,727
Operating (loss) profit	(7,150)	(6,841)	(16,494)	(15,098)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating (loss) profit	(653)	(737)	(1,653)	(2,613)
Wind | Operating Segments
Segment Reporting Information [Line Items]
Revenues	12,898	13,583	18,573	31,747
Operating (loss) profit	(1,235)	(1,991)	(4,264)	(1,864)
Grid | Operating Segments
Segment Reporting Information [Line Items]
Revenues	5,609	5,421	13,279	10,980
Operating (loss) profit	$ (5,262)	$ (4,113)	$ (10,577)	$ (10,621)

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The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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