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Risks and Uncertainties - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
Customer
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Customer
Jun. 30, 2020
USD ($)
Concentration Risk [Line Items]        
Unbilled receivables current $ 1,561   $ 1,561  
Revenue 17,679 $ 6,975 66,005 $ 25,575
Customer        
Concentration Risk [Line Items]        
Proceeds from accounts receivables     5,500  
Proceeds from financing receivables     6,100  
Unbilled receivables current $ 1,600   $ 1,600  
Number of customers | Customer 3   3  
Revenue | Customer        
Concentration Risk [Line Items]        
Number of customers | Customer 3   3  
Revenue | Customer | Unbilled Receivables        
Concentration Risk [Line Items]        
Revenue $ 1,000   $ 9,900  
Revenue | Trade Accounts Receivables | Customer        
Concentration Risk [Line Items]        
Revenue 4,500   17,300  
Revenue | Financing Receivables | Customer        
Concentration Risk [Line Items]        
Revenue $ 400   $ 13,200