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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2017
Sep. 30, 2016
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Cost $ 3,570  
Accumulated Amortization 1,207  
Net $ 2,363 $ 2,783
Completed technologies    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted Average Amortization Period (in years) 6 years  
Cost $ 2,370  
Accumulated Amortization 793  
Net $ 1,577  
Customer relationships    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted Average Amortization Period (in years) 6 years  
Cost $ 970  
Accumulated Amortization 324  
Net $ 646  
Trade names    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted Average Amortization Period (in years) 5 years  
Cost $ 230  
Accumulated Amortization 90  
Net $ 140