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Liquidity - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Short-term Debt [Line Items] |  |
Proceeds from issuance of convertible debt and equity financing | $ 2,550,000 | $ 9,700,000
Proceeds through restructuring of existing debt to convertible debt | $ 3,000,000 |

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