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Fair Value Measurements - Schedule of Assets and Liabilities Carried at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Cash equivalents $ 46,841 $ 32,589    
Derivative liabilities 1,399 1,217    
Reported value measurement | Quoted Prices in Active Markets (Level 1)        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Cash equivalents 46,841 32,589    
Reported value measurement | Significant Other Observable Inputs (Level 2)        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Cash equivalents 0 0    
Reported value measurement | Significant Unobservable Inputs (Level 3)        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Cash equivalents 0 0    
Warrants        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Derivative liabilities 1,399 1,217 $ 854 $ 1,923
Warrants | Reported value measurement | Quoted Prices in Active Markets (Level 1)        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Derivative liabilities 0 0    
Warrants | Reported value measurement | Significant Other Observable Inputs (Level 2)        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Derivative liabilities 0 0    
Warrants | Reported value measurement | Significant Unobservable Inputs (Level 3)        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Derivative liabilities $ 1,399 $ 1,217