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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Cost $ 3,570  
Accumulated Amortization 787  
Net $ 2,783 $ 3,397
Completed technologies [Member]    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted Average Amortization Period 6 years  
Cost $ 2,370  
Accumulated Amortization 516  
Net $ 1,854  
Customer relationships [Member]    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted Average Amortization Period 6 years  
Cost $ 970  
Accumulated Amortization 211  
Net $ 759  
Tradenames [Member]    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted Average Amortization Period 5 years  
Cost $ 230  
Accumulated Amortization 60  
Net $ 170