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Commitments and Contingencies - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Mar. 31, 2015
Commitments And Contingencies [Line Items]      
Amount paid by supplier $ 22,000 $ 22,000  
Sponsored Research Agreement with Related Party [Member]      
Commitments And Contingencies [Line Items]      
Sponsored Research Agreement termination notice period     30 days
Zertane Drug [Member] | Clinical Research and Trial Obligations [Member]      
Commitments And Contingencies [Line Items]      
Remaining commitment on contract for 2015     $ 273,000