Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Intangible Assets [Line Items]
Definite-lived intangible assets, Accumulated Amortization	$ (6,033)	$ (5,277)
Intangible assets, Gross Carrying Amount	8,793	8,223
Intangible assets, Net	$ 2,760	$ 2,946
Customer Lists [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	9 years	9 years
Definite-lived intangible assets, Gross Carrying Amount	$ 5,132	$ 4,857
Definite-lived intangible assets, Accumulated Amortization	(4,363)	(3,813)
Definite-lived intangible assets, Net	$ 769	$ 1,044
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)	(475)
Definite-lived intangible assets, Net	$ 0	$ 55
Non-compete [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	5 years
Definite-lived intangible assets, Gross Carrying Amount	$ 230
Definite-lived intangible assets, Accumulated Amortization	(12)
Definite-lived intangible assets, Net	$ 218
Patents and Other [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	16 years 9 months 18 days	16 years 9 months 18 days
Definite-lived intangible assets, Gross Carrying Amount	$ 2,321	$ 2,256
Definite-lived intangible assets, Accumulated Amortization	(1,128)	(989)
Definite-lived intangible assets, Net	1,193	1,267
Definite-Lived Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	8,213	7,643
Definite-lived intangible assets, Accumulated Amortization	(6,033)	(5,277)
Definite-lived intangible assets, Net	2,180	2,366
Trademarks [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net	$ 580	$ 580