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Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |
Revenues | $ 8,923 | $ 13,345
Operating (loss) profit | (14,693) | (9,344)
Unallocated corporate expenses |  |
Segment Reporting Information [Line Items] |  |
Operating (loss) profit | (2,093) | (999)
Wind |  |
Segment Reporting Information [Line Items] |  |
Revenues | 2,278 | 5,675
Wind | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating (loss) profit | (4,433) | (3,030)
Grid |  |
Segment Reporting Information [Line Items] |  |
Revenues | 6,645 | 7,670
Grid | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating (loss) profit | $ (8,167) | $ (5,315)

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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 + Details
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