Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 102,073	$ 88,544	$ 295,646	$ 245,258
Reclassification of rebates and allowances		5,500		13,800
Product revenue, net
Disaggregation of Revenue [Line Items]
Revenues	96,678	83,661	277,559	238,801
License and royalty revenues
Disaggregation of Revenue [Line Items]
Revenues	5,395	4,883	18,087	6,457
Total precision diagnostics
Disaggregation of Revenue [Line Items]
Revenues	87,879	80,057	263,989	231,331
DEFINITY
Disaggregation of Revenue [Line Items]
Revenues	57,636	50,359	173,448	139,989
Reclassification of rebates and allowances		5,100		12,600
TechneLite
Disaggregation of Revenue [Line Items]
Revenues	22,680	21,113	69,252	62,560
Reclassification of rebates and allowances		300		900
Other precision diagnostics
Disaggregation of Revenue [Line Items]
Revenues	7,563	8,585	21,289	28,782
Reclassification of rebates and allowances		100		200
Radiopharmaceutical oncology
Disaggregation of Revenue [Line Items]
Revenues	8,890	3,323	13,203	7,474
Strategic partnerships and other
Disaggregation of Revenue [Line Items]
Revenues	$ 5,304	$ 5,164	$ 18,454	$ 6,453