CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (3,602)	$ (2,642)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	16	22
Amortization of right of use asset	31	30
Stock-based compensation	111	186
Changes in operating assets and liabilities:
Prepaid expenses and other assets	314	(538)
Accounts payable	123	46
Accrued expenses	331	(543)
Lease liability	(32)	(30)
Net cash used in operating activities	(2,708)	(3,469)
Cash flows from investing activities:
Cash paid for purchase of property and equipment	0	(104)
Net cash used in investing activities	0	(104)
Cash flows from financing activities:
Cash in lieu of fractional shares for reverse stock split	(11)	0
Redemption of Series D preferred stock	(2)	0
Payment of taxes on net share settlements of restricted stock units	(25)	(25)
Net cash used in financing activities	(38)	(25)
Net decrease in cash and restricted cash	(2,746)	(3,598)
Cash and restricted cash at the beginning of period	11,831	24,107
Cash and restricted cash at the end of period	$ 9,085	$ 20,509