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Revenue Recognition - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Disaggregation Of Revenue [Line Items]          
Deferred contract liabilities $ 0   $ 0   $ 0
Deferred contract costs 0   0   0
Revenue 9,517,000 $ 11,845,000 18,600,000 $ 22,304,000  
Cost of revenue recognized from deferred contract cost 0 8,000 0 8,000  
Value of notes with customer 1,704,000   1,704,000   $ 3,472,000
Cost of revenue 18,002,000 15,772,000 33,210,000 30,557,000  
Product          
Disaggregation Of Revenue [Line Items]          
Revenue 0        
Partially financed product sale 12,500,000        
Cost of revenue 0        
Payments received from customer 3,000,000        
Secured Promissory Note          
Disaggregation Of Revenue [Line Items]          
Value of notes with customer $ 10,000,000   10,000,000    
Term of the notes 3 years        
Monthly principal and interest payments $ 300,000        
Frequency of payments monthly        
Deferred Contract Liability          
Disaggregation Of Revenue [Line Items]          
Revenue $ 0 $ 100,000 $ 0 $ 100,000