Industry and Geographic Information - Consolidated Net Product Revenues by Disease State (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 522,285	$ 277,743	$ 191,603
Infectious Disease [Member]
Segment Reporting Information [Line Items]
Revenues	183,160	165,099	121,416
Cardiac Immunoassay [Member]
Segment Reporting Information [Line Items]
Revenues	266,524	47,030	0
Specialized Diagnostic Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	53,243	51,978	60,681
Molecular Diagnostic Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	$ 19,358	$ 13,636	$ 9,506