Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (3,057)	$ (5,263)
Adjustments to reconcile net loss to net cash used in operating activities:
Gain on disposal of discontinued operations	0	(15,752)
Gain from settlement of account payable	(363)	0
Impairment loss	0	3,304
Share-based compensation expense	625	1,067
Changes in operating assets and liabilities:
Accounts receivable	(556)	96
Prepaid expenses	21	363
Other current assets	(5)	160
Operating lease assets	0	108
Other assets	0	213
Accounts payable	(445)	(1,772)
Accrued research and development costs	(38)	(2,185)
Accrued expenses and other current liabilities	(515)	(1,584)
Net cash used in operating activities	(4,333)	(21,245)
CASH FLOWS FROM INVESTING ACTIVITIES:
Net proceeds from disposal of discontinued operations	0	10,402
Net cash provided by investing activities	0	10,402
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from stock purchase agreement	0	5,000
Proceeds from exercises of stock options and ESPP	0	24
Net cash provided by financing activities	0	5,024
Effect of exchange rate changes on cash and cash equivalents	(6)	8
Net decrease in cash and cash equivalents	(4,339)	(5,811)
Cash and cash equivalents, beginning of period	7,571	13,382
Cash and cash equivalents, end of period	3,232	7,571
Supplemental Cash Flow Information [Abstract]
Non-cash gain on disposal of discontinued operations	$ 0	$ 5,350