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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Mar. 31, 2016
--- | --- | --- | --- | ---
Payables and Accruals [Abstract] |  |  |  |
Accounts payable | $ 1,800 | $ 3,207 |  |
Accrued inventories in-transit | 709 | 313 |  |
Accrued other miscellaneous expenses | 2,032 | 2,240 |  |
Accrued restructuring | 751 | 0 |  |
Accrued compensation | 5,333 | 5,042 |  |
Income taxes payable | 1,369 | 1,344 |  |
Accrued warranty | 2,026 | 2,344 | $ 2,774 | $ 3,601
Total | $ 14,020 | $ 14,490 |  |

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