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Liquidity - Additional Information (Detail) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Short-term Debt [Line Items] |  |  |  |
Proceeds from issuance of convertible debt and equity financing | $ 11,267,000 | $ 1,000,000 | $ 2,600,000 | $ 9,700,000
Proceeds from sale of common stock | 14,900,000 |  |  |
Proceeds from restructuring of existing debt to convertible debt | $ 3,000,000 |  |  |

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