Reportable Segment Information - Segment Revenue, Operating Income and Depreciation and Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 30,816	$ 24,344	$ 22,676	$ 22,241	$ 23,038	$ 22,227	$ 19,058	$ 17,013	$ 100,077	$ 81,336	$ 73,112
Operating income (loss)	$ 3,875	$ 1,017	$ 865	$ 712	$ (2,441)	$ (6,250)	$ 525	$ (633)	6,469	(8,799)	7,103
Depreciation and amortization									7,312	6,431	5,555
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									100,077	81,336	73,112
Operating income (loss)									15,414	141	15,195
Operating Segments [Member] | Medical Device [Member]
Segment Reporting Information [Line Items]
Revenue									78,353	60,513	53,983
Operating income (loss)									4,794	(8,478)	6,902
Depreciation and amortization									5,811	5,376	4,453
Operating Segments [Member] | In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenue									21,724	20,823	19,129
Operating income (loss)									10,620	8,619	8,293
Depreciation and amortization									464	394	412
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)									(8,945)	(8,940)	(8,092)
Depreciation and amortization									$ 1,037	$ 661	$ 690