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Share-Based Compensation Expense for Stock Awards (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation $ 2,113 $ 1,937
Research and development    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation 781 630
General and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share-based compensation $ 1,332 $ 1,307