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						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic and diluted, net loss attributable to Progenics	$ (18,842)	$ (19,700)	$ (18,735)	$ (24,357)	$ (15,172)	$ (13,424)	$ (57,277)	$ (52,953)
Basic and diluted, weighted average shares outstanding (in shares)	86,421			80,325			85,328	75,648
Basic and diluted, per share amount (in dollars per share)	$ (0.22)			$ (0.30)			$ (0.67)	$ (0.70)