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Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Mar. 31, 2013 | Mar. 31, 2012
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Derivative Liability [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance | $ 477 | $ 529 |
Valuation of derivative liability |  | 3,779 |
Valuation of derivative liability attributable to modification |  | 542 |
Mark to market adjustment | (52) | (3,792) |
Ending Balance | 477 | 529 |
Warrants [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Beginning Balance | 3,216 | 3,633 |
Warrant issuance with Senior Convertible Notes |  | 7,018 |
Warrant issuance with Senior Secured Term Loan |  | 380 |
Mark to market adjustment | (417) | (3,765) |
Ending Balance | $ 3,216 | $ 3,633 |

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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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