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Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 27,524	$ 25,772	$ 19,004	$ 23,723	$ 25,129	$ 21,250	$ 12,455	$ 11,696	$ 96,023	$ 70,530	$ 84,117
Operating loss	$ (1,708)	$ (3,312)	$ (6,841)	$ (8,257)	$ (5,715)	$ (7,735)	$ (26,400)	$ (12,667)	(20,118)	(52,517)	(41,429)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating loss									(4,027)	(11,306)	(13,693)
Wind
Segment Reporting Information [Line Items]
Revenues									68,883	51,307	55,608
Wind | Operating Segments
Segment Reporting Information [Line Items]
Operating loss									(1,256)	(14,321)	(5,213)
Grid
Segment Reporting Information [Line Items]
Revenues									27,140	19,223	28,509
Grid | Operating Segments
Segment Reporting Information [Line Items]
Operating loss									$ (14,835)	$ (26,890)	$ (22,523)

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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=26872669&loc=d3e20235-122688

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