Revenue Recognition - Summary of Sales from Contracts with Customers by Business Segment and Geography (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,864,288	$ 2,337,488	$ 7,359,633	$ 7,001,179
Percent of total revenues	100.00%	100.00%	100.00%	100.00%
U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,516,703	$ 2,318,718	$ 6,433,236	$ 6,948,660
Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	347,585	18,770	926,397	52,519
Radiochemical Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,294,546	$ 936,656	$ 3,162,820	$ 2,173,995
Percent of total revenues	45.00%	40.00%	43.00%	31.00%
Radiochemical Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,149,698	$ 917,886	$ 2,807,241	$ 2,151,960
Radiochemical Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	144,848	18,770	355,579	22,035
Cobalt Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 544,989	$ 97,849	$ 1,075,275	$ 687,177
Percent of total revenues	19.00%	4.00%	15.00%	10.00%
Cobalt Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 544,989	$ 97,849	$ 1,067,417	$ 687,177
Cobalt Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues			7,858
Nuclear Medicine Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 958,293	$ 1,022,291	$ 2,778,290	$ 3,053,909
Percent of total revenues	34.00%	44.00%	38.00%	44.00%
Nuclear Medicine Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 755,556	$ 1,022,291	$ 2,215,330	$ 3,023,425
Nuclear Medicine Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	202,737		562,960	30,484
Radiological Services
Disaggregation of Revenue [Line Items]
Total revenues	$ 54,760	$ 280,692	$ 171,048	$ 1,086,098
Percent of total revenues	2.00%	12.00%	2.00%	16.00%
Radiological Services | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 54,760	$ 280,692	$ 171,048	$ 1,086,098
Radiological Services | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues
Fluorine Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 11,700	$ 0	$ 172,200	$ 0
Percent of total revenues	0.00%	0.00%	2.00%	0.00%
Fluorine Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 11,700		$ 172,200
Fluorine Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues