Reportable Segment Information - Segment Revenue, Operating Income and Depreciation and Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 23,038	$ 22,227	$ 19,058	$ 17,013	$ 20,058	$ 17,790	$ 17,503	$ 17,761	$ 81,336	$ 73,112	$ 71,366
Operating (loss) income	$ (2,441)	$ (6,250)	$ 525	$ (633)	$ 415	$ 1,743	$ 1,677	$ 3,268	(8,799)	7,103	16,859
Depreciation and amortization									6,431	5,555	4,873
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating (loss) income									141	15,195	24,090
Operating Segments [Member] | Medical Device [Member]
Segment Reporting Information [Line Items]
Total revenue									60,513	53,983	53,202
Operating (loss) income									(8,478)	6,902	16,975
Depreciation and amortization									5,376	4,453	3,261
Operating Segments [Member] | In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenue									20,823	19,129	18,164
Operating (loss) income									8,619	8,293	7,115
Depreciation and amortization									394	412	789
Corporate [Member]
Segment Reporting Information [Line Items]
Operating (loss) income									(8,940)	(8,092)	(7,231)
Depreciation and amortization									$ 661	$ 690	$ 823