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Business Segment Information - Summary of Operating Segment and Asset Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net revenues	$ 35,989	$ 45,885	$ 104,937	$ 131,497
Operating income (loss)	13,052	10,857	14,526	15,917
Depreciation and amortization	1,922	1,842	5,532	5,588
Capital expenditures	2,448	1,454	7,961	5,938
Total assets	339,221		339,221		$ 315,571
OSUR [Member]
Segment Reporting Information [Line Items]
Net revenues	17,730	19,258	56,335	65,623
Operating income (loss)	8,080	(2,344)	4,595	(13,654)
Depreciation and amortization	889	879	2,555	2,883
Capital expenditures	1,796	908	5,341	3,682
Total assets	181,133		181,133		190,178
DNAG [Member]
Segment Reporting Information [Line Items]
Net revenues	18,259	26,627	48,602	65,874
Operating income (loss)	4,972	13,201	9,931	29,571
Depreciation and amortization	1,033	963	2,977	2,705
Capital expenditures	652	$ 546	2,620	$ 2,256
Total assets	$ 158,088		$ 158,088		$ 125,393

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