Note 3 - Net Loss Per Share - Calculations of Net (Loss) Income Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic and diluted, net loss attributable to Progenics	$ (19,700)	$ (18,735)	$ (15,172)	$ (13,424)	$ (38,435)	$ (28,596)
Basic and diluted, weighted average shares outstanding (in shares)	85,000		74,017		84,772	73,271
Basic and diluted, per share amount (in dollars per share)	$ (0.23)		$ (0.20)		$ (0.45)	$ (0.39)