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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Mar. 31, 2014
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Payables And Accruals [Abstract] |  |
Accounts payable | $ 7,063 | $ 1,749
Accrued inventories in-transit | 1,330 | 212
Accrued miscellaneous expenses | 4,424 | 6,076
Accrued outside services | 3,026 | 3,716
Accrued subcontractor program costs | 60 | 290
Accrued compensation | 4,070 | 5,939
Income taxes payable | 197 | 173
Accrued adverse purchase commitments | 0 | 402
Accrued warranty | 3,367 | 3,207
Total | $ 23,537 | $ 21,764

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