Reportable Segment Information - Segment Revenue, Operating Income and Depreciation and Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total revenue	$ 20,058	$ 17,790	$ 17,503	$ 17,761	$ 18,154	$ 19,972	$ 16,699	$ 16,541	$ 73,112	$ 71,366	$ 61,898
Operating income (loss)	$ 415	$ 1,743	$ 1,677	$ 3,268	$ 4,083	$ 6,597	$ 2,240	$ 3,939	7,103	16,859	19,089
Depreciation and amortization									5,555	4,873	2,805
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)									15,195	24,090	25,676
Operating Segments [Member] | Medical Device [Member]
Segment Reporting Information [Line Items]
Total revenue									53,983	53,202	45,944
Operating income (loss)									6,902	16,975	21,192
Depreciation and amortization									4,453	3,261	1,138
Operating Segments [Member] | In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenue									19,129	18,164	15,954
Operating income (loss)									8,293	7,115	4,484
Depreciation and amortization									412	789	873
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)									(8,092)	(7,231)	(6,587)
Depreciation and amortization									$ 690	$ 823	$ 794