Sale of Puerto Rico Subsidiary (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jan. 29, 2021	Dec. 31, 2020
Current assets
Total current assets	$ 0		$ 5,242
Current liabilities
Total current liabilities	0		1,793
Puerto Rican Radiopharmacy Servicing Subsidiary
Non-Current Liabilities:
Pre-tax book gain on disposal	$ 15,300
Disposed of by Sale | Puerto Rican Radiopharmacy Servicing Subsidiary
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group consideration		$ 18,000
Disposal group holdback amount		1,800
Current assets
Cash and cash equivalents		540	941
Accounts receivable, net		1,959	2,191
Inventory		530	420
Other current assets		65	43
Total current assets		3,094	3,595
Non-Current Assets:
Property, plant & equipment, net		780	761
Intangibles, net		96	96
Other long-term assets		774	790
Total assets held for sale		4,744	5,242
Current liabilities
Accounts payable		185	224
Accrued expense and other liabilities		369	661
Total current liabilities		554	885
Non-Current Liabilities:
Asset retirement obligations		306	302
Other long-term liabilities		588	606
Total liabilities held for sale		$ 1,448	$ 1,793