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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic and diluted, net loss attributable to Progenics	$ (15,172)	$ (16,636)	$ (28,596)	$ (32,996)
Basic and diluted, weighted average shares outstanding (in shares)	74,017	70,202	73,271	70,214
Basic and diluted, per share amount (in dollars per share)	$ (0.20)	$ (0.24)	$ (0.39)	$ (0.47)