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Fair Value Measurements - Schedule of Assets and Liabilities Carried at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash equivalents $ 20,185 $ 17,675
Warrants 1,841 2,601
Quoted Prices in Active Markets (Level 1)
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash equivalents 20,185 17,675
Warrants 0 0
Significant Other Observable Inputs (Level 2)
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Warrants 0 0
Significant Unobservable Inputs (Level 3)
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Warrants $ 1,841 $ 2,601