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Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Mar. 31, 2012
--- | --- | --- | --- | ---
Derivative Liability |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | $ 181 | $ 529 | $ 2,763 |
Valuation of derivative liability |  |  | 3,779 |
Warrant issuance with Senior Convertible Notes |  |  |  |
Warrant issuance with Senior Secured Term Loan |  |  |  |
Valuation of derivative liability attributable to modification |  | 542 |  |
Mark to market adjustment | (348) | (2,776) | (1,016) |
Ending Balance | 181 | 529 | 2,763 |
Warrants |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Beginning Balance | 2,626 | 3,633 | 7,517 |
Valuation of derivative liability |  |  |  |
Warrant issuance with Senior Convertible Notes |  |  | 7,018 |
Warrant issuance with Senior Secured Term Loan |  |  | 380 |
Valuation of derivative liability attributable to modification |  |  |  |
Mark to market adjustment | (1,007) | (3,884) | 119 |
Ending Balance | $ 2,626 | $ 3,633 | $ 7,517 |

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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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