Condensed Consolidated Statements of Changes in Stockholders’ Equity (Deficit) (unaudited) - USD ($) $ in Thousands	Series 1 Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2019		$ 3	$ 10,651	$ (12,782)		$ (2,128)
Balance (in Shares) at Dec. 31, 2019		2,627,533
Issuance of Common Stock in ArTara Private Placement, net of offering costs			1,867			1,867
Issuance of Common Stock in ArTara Private Placement, net of offering costs (in Shares)		284,875
Issuance of Common Stock in Proteon Private Placement, net of offering costs		$ 2	12,411			12,413
Issuance of Common Stock in Proteon Private Placement, net of offering costs (in Shares)		1,896,888
Issuance of Series 1 Convertible Preferred Stock in Proteon Private Placement, net of offering costs			25,319			25,319
Issuance of Series 1 Convertible Preferred Stock in Proteon Private Placement, net of offering costs (in Shares)	3,879
Reverse business combination		$ 1	34,532			34,533
Reverse business combination (in Shares)		1,033,907
Stock-based compensation - restricted stock units			2,430			2,430
Stock-based compensation - stock options			368			368
Net loss				(10,060)		(10,060)
Balance at Mar. 31, 2020		$ 6	87,578	(22,842)		64,742
Balance (in Shares) at Mar. 31, 2020	3,879	5,843,203
Balance at Dec. 31, 2020		$ 11	245,992	(46,760)		199,243
Balance (in Shares) at Dec. 31, 2020	8,027	11,211,840
Settlement of restricted stock units			(228)			(228)
Settlement of restricted stock units (in Shares)		16,766
Stock-based compensation - restricted stock units			1,303			1,303
Stock-based compensation - stock options			1,437			1,437
Unrealized losses on available-for-sale marketable debt securities					$ (164)	(164)
Net loss				(13,465)		(13,465)
Balance at Mar. 31, 2021		$ 11	$ 248,504	$ (60,225)	$ (164)	$ 188,126
Balance (in Shares) at Mar. 31, 2021	8,027	11,228,606