Sale of Puerto Rico Subsidiary - Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Jan. 29, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents included in assets held for sale	$ 0		$ 941	$ 0
Assets held for sale	0		5,242
Current liabilities
Liabilities held for sale	0		1,793
Puerto Rican Radiopharmacy Servicing Subsidiary
Non-Current Liabilities:
Pre-tax book gain on disposal	15,300
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Puerto Rican Radiopharmacy Servicing Subsidiary
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price for stock	18,000
Disposal group holdback amount	$ 1,800
Current assets
Cash and cash equivalents included in assets held for sale		$ 540	941
Accounts receivable, net		1,959	2,191
Inventory		530	420
Other current assets		65	43
Assets held for sale		3,094	3,595
Non-Current Assets:
Property, plant and 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 expenses and other liabilities		369	661
Liabilities held for sale		554	885
Non-Current Liabilities:
Asset retirement obligations		306	302
Other long-term liabilities		588	606
Liabilities		$ 1,448	$ 1,793