Note 14 - Net (Loss) Income 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								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic and diluted, net loss attributable to Progenics									$ (68,552)	$ (67,657)	$ (51,013)
Basic and diluted, weighted average shares outstanding (in shares)									85,607	77,890	70,284
Net loss per share - basic and diluted (in dollars per share)	$ (0.13)	$ (0.22)	$ (0.23)	$ (0.22)	$ (0.17)	$ (0.30)	$ (0.20)	$ (0.19)	$ (0.80)	$ (0.87)	$ (0.73)