Note 3 - Net Loss Per Share - Calculations of Net Loss Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic and diluted, net loss attributable to Progenics	$ (24,357)	$ (15,352)	$ (52,953)	$ (48,348)
Basic and diluted, weighted average shares outstanding (in shares)	80,325	70,270	75,648	70,233
Basic and diluted, per share amount (in dollars per share)	$ (0.30)	$ (0.22)	$ (0.70)	$ (0.69)