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, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 22,676	$ 19,058	$ 44,917	$ 36,071
Operating income (loss)	865	525	1,577	(108)
Depreciation and amortization	1,819	1,586	3,575	3,106
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	22,676	19,058	44,917	36,071
Operating income (loss)	2,892	2,655	5,704	3,936
Operating Segments [Member] | Medical Device [Member]
Segment Reporting Information [Line Items]
Total revenue	17,301	14,052	34,559	26,826
Operating income (loss)	(23)	232	334	(157)
Depreciation and amortization	1,447	1,324	2,835	2,596
Operating Segments [Member] | In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenue	5,375	5,006	10,358	9,245
Operating income (loss)	2,915	2,423	5,370	4,093
Depreciation and amortization	117	100	233	190
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(2,027)	(2,130)	(4,127)	(4,044)
Depreciation and amortization	$ 255	$ 162	$ 507	$ 320