Segment and Geographical Information - Segment Revenue, Operating Income (Loss) and Depreciation and Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Total revenue	$ 19,058	$ 17,503	$ 36,071	$ 35,264
Operating income (loss)	525	1,677	(108)	4,945
Depreciation and amortization	1,586	1,328	3,106	2,610
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	2,655	3,740	3,936	8,915
Operating Segments [Member] | Medical Device [Member]
Segment Reporting Information [Line Items]
Total revenue	14,052	12,726	26,826	26,482
Operating income (loss)	232	1,504	(157)	5,223
Depreciation and amortization	1,324	1,053	2,596	2,058
Operating Segments [Member] | In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenue	5,006	4,777	9,245	8,782
Operating income (loss)	2,423	2,236	4,093	3,692
Depreciation and amortization	100	103	190	206
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(2,130)	(2,063)	(4,044)	(3,970)
Depreciation and amortization	$ 162	$ 172	$ 320	$ 346