Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets Valuation Allowance [Roll Forward]
Balance at Beginning of Year	$ 9,350	$ 6,985
Provision related to current period revenues	25,772	19,675
Release valuation allowance	(24,159)	(16,706)
Balance at End of Year	10,977	9,350
Valuation Allowance, Deferred Tax Asset
Deferred Tax Assets Valuation Allowance [Roll Forward]
Balance at Beginning of Year	3,456	1,238
Provision related to current period revenues	(189)	311
Foreign currency	(211)	31
Increase due to Progenics acquisition	867	2,479
Release valuation allowance		(603)
Balance at End of Year	$ 3,923	$ 3,456