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Intangible Assets - Carrying Amount (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 959 $ 943
Accumulated Amortization (534) (516)
Total 425 427
Patent and trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 959 943
Accumulated Amortization (534) (516)
Total $ 425 $ 427
Minimum | Patent and trademarks    
Finite-Lived Intangible Assets [Line Items]    
Useful Life (in years) 3 years  
Maximum | Patent and trademarks    
Finite-Lived Intangible Assets [Line Items]    
Useful Life (in years) 10 years