Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2022	$ 19,247	$ 1,342	$ 565,541	$ (547,636)
Balance (in shares) at Dec. 31, 2022		14,215
Exercise of stock options	179	$ 1	178
Exercise of stock options (in shares)		40
Stock-based compensation	17		17
Net loss	(271)			(271)
Balance at Mar. 31, 2023	19,172	$ 1,343	565,736	(547,907)
Balance (in shares) at Mar. 31, 2023		14,255
Balance at Dec. 31, 2023	18,747	$ 1,343	566,221	(548,817)
Balance (in shares) at Dec. 31, 2023		14,351
Exercise of stock options	1,485	$ 2	1,483
Exercise of stock options (in shares)		181
Stock-based compensation	48		48
Net loss	201,370			201,370
Balance at Mar. 31, 2024	$ 221,650	$ 1,345	$ 567,752	$ (347,447)
Balance (in shares) at Mar. 31, 2024		14,532