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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Cost $ 9,977 $ 3,570
Accumulated Amortization 2,030 1,273
Net $ 7,947 $ 2,297
Completed technologies    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Amortization Period 5 years 3 months 18 days 6 years
Cost $ 7,326 $ 2,370
Accumulated Amortization 1,238 833
Net $ 6,088 $ 1,537
Customer relationships    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Amortization Period 3 years 9 months 18 days 6 years
Cost $ 2,268 $ 970
Accumulated Amortization 656 341
Net $ 1,612 $ 629
Trade names    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Amortization Period 4 years 2 months 12 days 5 years
Cost $ 383 $ 230
Accumulated Amortization 136 99
Net $ 247 $ 131