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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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