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Schedule of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Allowance For Doubtful Accounts Receivable [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 261 $ 101
Charged to costs and expenses [1] 215 347 241
Deductions [2] (94) (187) (140)
Balance at end of year 382 261 101
SEC Schedule, 12-09, Allowance, Notes Receivable [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 182
Charged to costs and expenses [1] (80) 602
Deductions [2] (420)
Balance at end of year 102 182
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year [3] $ 1,273
Charged to costs and expenses [1],[3]   1,273
Deductions [2],[3]  
Balance at end of year [3]   $ 1,273
[1] Charged to bad debts expense (under other selling, general and administrative expenses) in the consolidated statements of operations.
[2] Written off against gross receivable and allowance.
[3] Included in deferred tax liability, net in the consolidated balance sheets.