Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Sep. 30, 2016
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost	$ 3,570
Accumulated Amortization	1,196
Net	$ 2,374	$ 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	783
Net	$ 1,587
Customer relationships
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	6 years
Cost	$ 970
Accumulated Amortization	321
Net	$ 649
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	5 years
Cost	$ 230
Accumulated Amortization	92
Net	$ 138