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Share-Based Payment Awards - Key Assumptions Used to Apply Option Pricing Model For Options Granted (2016 Long Term Incentive Plan) (Detail) - Other Inducement Grants [Member]
3 Months Ended
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option life (in years) 6 years
Stock volatility, minimum 59.00%
Stock volatility, maximum 60.00%
Risk-free interest rate, minimum 2.81%
Risk-free interest rate, maximum 2.92%
Expected dividends 0.00%