Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016
Intangible Assets [Line Items]
Definite-lived intangible assets, Accumulated Amortization	$ (9,145)	$ (8,604)
Intangible assets, Gross Carrying Amount	30,239	31,129
Intangible assets, Net	$ 21,094	$ 22,525
Customer Lists and Relationships [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	8 years 10 months 24 days	8 years 10 months 24 days
Definite-lived intangible assets, Gross Carrying Amount	$ 16,979	$ 17,692
Definite-lived intangible assets, Accumulated Amortization	(6,434)	(6,123)
Definite-lived intangible assets, Net	$ 10,545	$ 11,569
Core Technology [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	8 years	8 years
Definite-lived intangible assets, Gross Carrying Amount	$ 530	$ 530
Definite-lived intangible assets, Accumulated Amortization	$ (530)	$ (530)
Developed Technology [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	11 years 9 months 18 days	11 years 9 months 18 days
Definite-lived intangible assets, Gross Carrying Amount	$ 8,610	$ 8,724
Definite-lived intangible assets, Accumulated Amortization	(800)	(618)
Definite-lived intangible assets, Net	$ 7,810	$ 8,106
Non-compete [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	5 years	5 years
Definite-lived intangible assets, Gross Carrying Amount	$ 230	$ 230
Definite-lived intangible assets, Accumulated Amortization	(69)	(58)
Definite-lived intangible assets, Net	$ 161	$ 172
Patents and Other [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	16 years 6 months	16 years 6 months
Definite-lived intangible assets, Gross Carrying Amount	$ 2,322	$ 2,321
Definite-lived intangible assets, Accumulated Amortization	(1,312)	(1,275)
Definite-lived intangible assets, Net	1,010	1,046
Definite-Lived Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	28,671	29,497
Definite-lived intangible assets, Accumulated Amortization	(9,145)	(8,604)
Definite-lived intangible assets, Net	19,526	20,893
In-Process Research and Development [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net	927	987
Trademarks and Trade Names [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net	$ 641	$ 645