Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	At the Market [Member]	Direct Financing [Member]	Common Stock [Member]	Common Stock [Member] At the Market [Member]	Common Stock [Member] Direct Financing [Member]	Accumulated Deficit [Member]	Noncontrolling Deficit [Member]	Accumulated Other Comprehensive Income / (Loss) [Member]
Balance at Dec. 31, 2022	$ 71,936			$ 440,280			$ (363,370)	$ (1,403)	$ (3,571)
Balance, shares at Dec. 31, 2022				170,093
Shares issued through registered direct financings		$ 6,625			$ 6,625
Shares issued through registered direct financings, shares					4,775
Financing related fees	(221)			$ (221)
Shares issued upon vesting of restricted stock units, net of shares retired to pay employees' taxes	(37)			$ (37)
Shares issued upon vesting of restricted stock units, net of shares retired to pay employees' taxes, shares				53
Shares issued upon exercise of stock options	56			$ 56
Shares issued upon exercise of stock options, shares				66
Stock-based compensation	4,640			$ 4,640
Unrealized gain on marketable debt securities	150								150
Foreign currency translation adjustment	353								353
Net loss	(21,479)						(21,486)	7
Balance at Dec. 31, 2023	62,023			$ 451,343			(384,856)	(1,396)	(3,068)
Balance, shares at Dec. 31, 2023				174,987
Shares issued through registered direct financings		$ 70	$ 29,711		$ 70	$ 29,711
Shares issued through registered direct financings, shares					56	45,041
Financing related fees	(1,685)			$ (1,685)
Shares issued upon vesting of restricted stock units, net of shares retired to pay employees' taxes	(23)			$ (23)
Shares issued upon vesting of restricted stock units, net of shares retired to pay employees' taxes, shares				45
Shares issued upon exercise of stock options	229			$ 229
Shares issued upon exercise of stock options, shares				287
Stock-based compensation	5,077			$ 5,077
Unrealized gain on marketable debt securities	3								3
Foreign currency translation adjustment	189								189
Net loss	(18,582)						(18,609)	27
Balance at Dec. 31, 2024	$ 77,012			$ 484,722			$ (403,465)	$ (1,369)	$ (2,876)
Balance, shares at Dec. 31, 2024				220,416