UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	PREFERRED STOCK	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED DEFICIT	ACCUMULATED OTHER COMPREHENSIVE INCOME
Beginning balance (in shares) at Dec. 31, 2021			8,544,225
Beginning balance at Dec. 31, 2021	$ 2,535		$ 1	$ 372,562	$ (370,080)	$ 52
Increase (Decrease) in Shareholders' Equity
Net Income (Loss) Attributable to Parent	(7,162)				(7,162)
Unrealized Loss on Available-for-Sale Debt Instrument Investments	0
Foreign Currency Translation Adjustments	(1)					(1)
Stock-based Compensation and modification expense	$ (179)			(179)
Ending balance (in shares) at Mar. 31, 2022	8,544,225		8,544,225
Ending balance at Mar. 31, 2022	$ (4,807)		$ 1	372,383	(377,242)	51
Beginning balance (in shares) at Dec. 31, 2022	15,000	15,000
Beginning balance (in shares) at Dec. 31, 2022	12,163,673		12,163,673
Beginning balance at Dec. 31, 2022	$ 14,106		$ 1	402,701	(388,759)	163
Increase (Decrease) in Shareholders' Equity
Net Income (Loss) Attributable to Parent	(1,750)				(1,750)	0
Unrealized Loss on Available-for-Sale Debt Instrument Investments	(3)					(3)
Foreign Currency Translation Adjustments	(4)					(4)
Issuance of common stock upon exercise of prefunded warrants (in shares)			389,000
Stock-based Compensation and modification expense	$ 193			193
Ending balance (in shares) at Mar. 31, 2023	15,000	15,000
Ending balance (in shares) at Mar. 31, 2023	12,552,673		12,552,673
Ending balance at Mar. 31, 2023	$ 12,542		$ 1	$ 402,894	$ (390,509)	$ 156