Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (26,960)	$ (20,606)
Adjustments to reconcile net loss to net cash used in operating activities
Compensation cost for stock options granted	6,788	5,267
Depreciation and amortization	8	23
Disposal of assets	3	0
Changes in operating assets and liabilities:
Prepaid expenses	(1,543)	(674)
Research and development tax rebate receivable	329	(437)
Other current assets	(1,230)	(521)
Other assets	(597)	0
Accounts payable	1,248	128
Accrued expenses	855	111
Payroll liabilities	341	220
Other current liabilities	(2)	17
Net cash used in operating activities	(20,760)	(16,472)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investment in equity securities	(4,700)	0
Purchase of furniture and equipment	(27)	(9)
Net cash used in investing activities	(4,727)	(9)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of common stock and warrants, net of issuance costs	0	69,668
Proceeds from exercise of warrants	0	43,818
Proceeds from exercise of employee stock options	0	391
Payment of taxes related to net-exercise of employee stock options	0	(573)
Net cash provided by financing activities	0	113,304
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(25,487)	96,823
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING BALANCE	136,487	39,664
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, ENDING BALANCE	111,000	136,487
SUPPLEMENTAL DISCLOSURES
Cash and cash equivalents	110,890	136,377
Restricted cash	110	110
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows	111,000	136,487
NONCASH INVESTING AND FINANCING ACTIVITIES
Reclassification of the warrant liability to equity upon adoption of accounting standard	0	13,003
Common stock issued upon cashless exercise of stock options	0	1,333
Conversion of Series B Convertible Preferred Stock into Common Stock [Member]
NONCASH INVESTING AND FINANCING ACTIVITIES
Conversion of Series B convertible preferred stock to common stock	$ 0	$ 39