Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 92,509	$ 90,704
Reclassification of rebates and allowances		4,700
Product revenue, net
Disaggregation of Revenue [Line Items]
Revenues	87,319	90,213
License and royalty revenues
Disaggregation of Revenue [Line Items]
Revenues	5,190	491
Total precision diagnostics
Disaggregation of Revenue [Line Items]
Revenues	85,755	88,341
DEFINITY
Disaggregation of Revenue [Line Items]
Revenues	55,971	52,505
Reclassification of rebates and allowances		4,300
TechneLite
Disaggregation of Revenue [Line Items]
Revenues	22,800	22,779
Reclassification of rebates and allowances		300
Other precision diagnostics
Disaggregation of Revenue [Line Items]
Revenues	6,984	13,057
Reclassification of rebates and allowances		100
Radiopharmaceutical oncology
Disaggregation of Revenue [Line Items]
Revenues	1,500	1,968
Strategic partnerships and other
Disaggregation of Revenue [Line Items]
Revenues	$ 5,254	$ 395