Reportable Segment Information - Segment Revenue, Operating Income and Depreciation and Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total revenue	$ 18,154	$ 19,972	$ 16,699	$ 16,541	$ 17,364	$ 15,914	$ 14,415	$ 14,205	$ 71,366	$ 61,898	$ 57,439
Operating income (loss)	$ 4,083	$ 6,597	$ 2,240	$ 3,939	$ 4,266	$ 5,857	$ 3,932	$ 5,034	16,859	19,089	18,576
Depreciation and amortization									4,873	2,805	2,715
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)									24,090	25,676	26,095
Operating Segments [Member] | Medical Device [Member]
Segment Reporting Information [Line Items]
Total revenue									53,202	45,944	43,068
Operating income (loss)									16,975	21,192	22,636
Depreciation and amortization									3,261	1,138	1,136
Operating Segments [Member] | In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenue									18,164	15,954	14,371
Operating income (loss)									7,115	4,484	3,459
Depreciation and amortization									789	873	850
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)									(7,231)	(6,587)	(7,519)
Depreciation and amortization									$ 823	$ 794	$ 729