Revenue Recognition - Summary of Sales from Contracts with Customers by Business Segment and Geography (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,527,852	$ 2,801,326
Percent of total revenues	100.00%	100.00%
U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,464,137	$ 1,993,600
Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	63,715	807,726
Radiochemical Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 463,232	$ 583,841
Percent of total revenues	18.00%	21.00%
Radiochemical Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 459,967	$ 528,917
Radiochemical Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	3,265	54,924
Cobalt Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 376,089	$ 327,778
Percent of total revenues	15.00%	12.00%
Cobalt Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 336,089	$ 327,778
Cobalt Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	40,000
Nuclear Medicine Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,100,922	$ 1,002,113
Percent of total revenues	44.00%	35.00%
Nuclear Medicine Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,080,472	$ 997,733
Nuclear Medicine Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	20,450	4,380
Radiological Services
Disaggregation of Revenue [Line Items]
Total revenues	$ 587,609	$ 887,594
Percent of total revenues	23.00%	32.00%
Radiological Services | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 587,609	$ 139,172
Radiological Services | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues		748,422
Fluorine Products
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0
Percent of total revenues	0.00%	0.00%
Fluorine Products | U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0
Fluorine Products | Outside U.S.
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0