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Trade Accounts and Financing Receivables - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Mar. 31, 2020
Jun. 30, 2021
Sep. 30, 2020
Accounts Notes And Loans Receivable [Line Items]          
Promissory notes receivable maturity month and year       2023-01  
Value of notes with customer $ 8,682,000     $ 8,682,000 $ 184,000
Term of sales-type lease 6 months     6 months  
Future minimum lease payments $ 3,000,000.0     $ 3,000,000.0  
Future minimum lease payments of unearned income 31,000     31,000  
Future minimum lease payments due in fiscal year 2021 2,000,000.0     2,000,000.0  
Future minimum lease payments due in fiscal year 2022 1,000,000.0     1,000,000.0  
Interest income related to lease $ 12,000     $ 12,000  
Secured Promissory Note          
Accounts Notes And Loans Receivable [Line Items]          
Value of notes with customer     $ 10,000,000.0    
Term of the notes     3 years    
Monthly principal and interest payments     $ 300,000    
Frequency of payments     monthly monthly  
Short-Term Promissory Note          
Accounts Notes And Loans Receivable [Line Items]          
Value of notes with customer   $ 13,200,000      
Interest rate of the notes   5.00%      
Maturity date   Mar. 31, 2021      
Manufactured Rental Equipment          
Accounts Notes And Loans Receivable [Line Items]          
Promissory notes receivable maximum interest rate 8.00%     8.00%  
Product          
Accounts Notes And Loans Receivable [Line Items]          
Partially financed product sale     $ 12,500,000