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Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies - Financing Receivables (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2019
Oct. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accumulated deficit $ (209,002) $ (205,728) $ (207,419)  
Financing receivables, current, net of allowances of $526, respectively 526   526  
Financing receivables, gross 290   281  
Allowance for losses on financing receivables (526)   (526)  
Investment in sales-type lease        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivables, gross 413   399  
Support contract receivable        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivables, gross 290   281  
Deferred product        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases receivable, deferred income       $ 1,500
Product receivables        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivables, gross $ 526   $ 526 $ 2,100
Minimum | Support contract receivable        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivables, contract term 3 years      
Maximum | Support contract receivable        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivables, contract term 5 years