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Share-Based Payment Awards - Compensation Expense from Stock-Based Payment Awards (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense $ 2,550 $ 4,568 $ 2,704 $ 2,456
Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense 913 1,073 1,252 1,109
Sales and Marketing [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense 325 715 50 0
General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense $ 1,312 $ 2,780 $ 1,402 $ 1,347