Revenue Recognition - Summary of Sales from Contracts with Customers Disaggregated by Business Segment and Geography (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,617,514	$ 2,864,288	$ 7,369,922	$ 7,359,633
Percent of total revenues	100.00%	100.00%	100.00%	100.00%
U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,250,025	$ 2,516,703	$ 6,298,188	$ 6,433,236
Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	367,489	347,585	1,071,734	926,397
Radiochemical Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,210,615	$ 1,294,546	$ 3,100,001	$ 3,162,820
Percent of total revenues	46.00%	45.00%	42.00%	43.00%
Radiochemical Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,065,690	$ 1,149,698	$ 2,703,614	$ 2,807,241
Radiochemical Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	144,925	144,848	396,387	355,579
Cobalt Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 408,808	$ 544,989	$ 1,104,176	$ 1,075,275
Percent of total revenues	16.00%	19.00%	15.00%	15.00%
Cobalt Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 407,308	$ 544,989	$ 1,083,332	$ 1,067,417
Cobalt Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	1,500		20,844	7,858
Nuclear Medicine Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 973,439	$ 958,293	$ 2,988,326	$ 2,778,290
Percent of total revenues	37.00%	34.00%	41.00%	38.00%
Nuclear Medicine Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 752,375	$ 755,556	$ 2,333,823	$ 2,215,330
Nuclear Medicine Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	221,064	202,737	654,503	562,960
Radiological Services
Disaggregation of Revenue [Line Items]
Total revenues	$ 16,889	$ 54,760	$ 147,644	$ 171,048
Percent of total revenues	1.00%	2.00%	2.00%	2.00%
Radiological Services | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 16,889	$ 54,760	$ 147,644	$ 171,048
Radiological Services | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues
Fluorine Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 7,763	$ 11,700	$ 29,775	$ 172,200
Percent of total revenues	0.00%	0.00%	0.00%	2.00%
Fluorine Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 7,763	$ 11,700	$ 29,775	$ 172,200
Fluorine Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues