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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Operating Loss Carryforwards [Line Items] |  |
Unrecognized tax benefits | $ 0 | $ 0
Increase (decrease) in valuation allowance | 1,676,000 | 2,107,000
Federal net operating loss carryforwards | 119,845,000 |
State net operating loss carryforwards | 69,040,000 |
Foreign net operating loss carryforwards | $ 326,000 |
Federal and state net operating loss carryforwards expiring year | 2028 |
Federal research tax credit carryforwards expiration period | 2028 |
Accrued expense regarding interest or penalties | $ 0 |
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Research tax credit carryforwards | 1,793,000 |
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Research tax credit carryforwards | $ 2,076,000 |
Accounting Standards Update 2016-09 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Unrecognized excess tax benefits |  | $ 6,332,000

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