Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Summary of Sales from Contracts with Customers Disaggregated by Business Segment and Geography

	Three Months Ended March 31, 2020									Three Months Ended March 31, 2019
	U.S.		Outside U.S.		Total Revenues		% of Total Revenues			U.S.		Outside U.S.		Total Revenues		% of Total Revenues
Radiochemical Products	$	668,591	$	86,630	$	755,221		32	%	$	459,967	$	3,265	$	463,232		18	%
Cobalt Products		305,620		—		305,620		13	%		336,089		40,000		376,089		15	%
Nuclear Medicine Products		867,604		174,520		1,042,124		45	%		1,080,472		20,450		1,100,922		44	%
Radiological Services		72,321		—		72,321		3	%		587,609		—		587,609		23	%
Fluorine Products		160,500		—		160,500		7	%		—		—		—		0	%
	$	2,074,636	$	261,150	$	2,335,786		100	%	$	2,464,137	$	63,715	$	2,527,852		100	%