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Accounts and Long Term Receivable (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable $ 10,856   $ 10,856   $ 15,114
Long-term receivable 5,146   $ 5,146   5,328
Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Maturity term of accounts and long term receivables     1 year    
Financing receivables          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable 2,300   $ 2,300   2,100
Long term receivable - financing component $ 5,000   $ 5,000   5,000
Long term receivables interest rate 6.50%   6.50%    
Amount of allowance for credit losses or impairments with a contractual maturity of over one year $ 0   $ 0    
Accounts and long-term receivable past due 0   0   0
Activity in allowance for credit losses for accounts and long-term receivables 0 $ 0 $ 0 $ 0  
Contract Receivable, Fiscal Year Maturity [Abstract]          
2020 (remaining 3 months)         1,526
2021         2,678
2022         2,300
2023         1,423
Total payments         7,927
Less: unearned income         666
Total, net of unearned income         $ 7,261
Financing receivables | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Maturity term of accounts and long term receivables     1 year    
Financing receivables | Other Income          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts And Long Term Receivable, Interest Income $ 120 $ 11 $ 349 $ 12