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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic and diluted, net loss attributable to Progenics									$ (67,657)	$ (51,013)	$ 10,806
Basic and diluted, weighted average shares outstanding (in shares)									77,890	70,284
Net loss per share - basic and diluted (in dollars per share)	$ (0.17)	$ (0.30)	$ (0.20)	$ (0.19)	$ (0.04)	$ (0.22)	$ (0.24)	$ (0.23)	$ (0.87)	$ (0.73)
Basic, net loss attributable to Progenics											$ 10,806
Basic, weighted average shares outstanding (in shares)									77,890	70,284	70,003
Basic, per share amount (in dollars per share)									$ (0.87)	$ (0.73)	$ 0.15
Dilutive effect of stock options, weighted average shares outstanding (in shares)											152
Diluted, net loss attributable to Progenics											$ 10,806
Diluted, weighted average shares outstanding (in shares)									77,890	70,284	70,155
Diluted, per share amount (in dollars per share)									$ (0.87)	$ (0.73)	$ 0.15