Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost	$ 38,587	$ 38,587
Accumulated Amortization	7,845	5,640
Net	$ 30,742	$ 32,947
Completed technologies
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	6 years 4 months 24 days	6 years 4 months 24 days
Cost	$ 20,341	$ 20,341
Accumulated Amortization	4,113	3,070
Net	$ 16,228	$ 17,271
Customer relationships
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	4 years 9 months 18 days	4 years 9 months 18 days
Cost	$ 17,628	$ 17,628
Accumulated Amortization	3,472	2,351
Net	$ 14,156	$ 15,277
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	4 years 6 months	4 years 6 months
Cost	$ 618	$ 618
Accumulated Amortization	260	219
Net	$ 358	$ 399