Revenue Recognition - Summary of Sales from Contracts with Customers Disaggregated by Business Segment and Geography (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,759,896	$ 2,159,559	$ 4,752,408	$ 4,495,345
Percent of total revenues	100.00%	78.00%	100.00%	100.00%
U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,422,206	$ 1,842,522	$ 4,048,165	$ 3,916,532
Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	337,689	317,037	704,243	578,813
Radiochemical Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,228,209	$ 1,113,053	$ 1,889,386	$ 1,868,274
Percent of total revenues	45.00%	40.00%	40.00%	39.00%
Radiochemical Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,091,114	$ 988,952	$ 1,637,924	$ 1,657,543
Radiochemical Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	137,095	124,101	251,462	210,731
Cobalt Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 576,994	$ 224,666	$ 695,367	$ 530,286
Percent of total revenues	21.00%	8.00%	15.00%	11.00%
Cobalt Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 562,744	$ 217,433	$ 676,023	$ 522,428
Cobalt Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	14,250	7,233	19,344	7,858
Nuclear Medicine Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 885,728	$ 777,873	$ 2,014,887	$ 1,819,997
Percent of total revenues	32.00%	28.00%	42.00%	38.00%
Nuclear Medicine Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 699,384	$ 592,170	$ 1,581,450	$ 1,459,773
Nuclear Medicine Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	186,344	185,703	433,437	360,224
Radiological Services
Disaggregation of Revenue [Line Items]
Total revenues	$ 68,965	$ 43,967	$ 130,755	$ 116,288
Percent of total revenues	2.00%	2.00%	3.00%	2.00%
Radiological Services | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 68,965	$ 43,967	$ 130,755	$ 116,288
Radiological Services | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues
Fluorine Products
Disaggregation of Revenue [Line Items]
Total revenues			$ 22,013	$ 160,500
Percent of total revenues	0.00%	0.00%	0.00%	3.00%
Fluorine Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues			$ 22,013	$ 160,500
Fluorine Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues