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Equity - Summary of Total Stock-Based Compensation Expense Included in Selling General and Administrative Expenses on Statements of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 48 $ 112
Stock Options [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense 17 84
Common Stock Awards [Member]    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 31 $ 28