Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (4,319)	$ (5,976)	$ (9,289)	$ (13,891)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	31	31	63	61
Stock-based compensation			946	1,012
License rights expense settled in stock			0	772
Change in fair value of warrant liability	(1,696)	(36)	(3,151)	(75)
Operating lease, net			108	104
Changes in operating assets and liabilities:
Prepaid expenses and other current assets			(163)	(757)
Accounts payable			335	2,041
Accrued expenses and other current liabilities			(1,515)	(410)
Net cash used in operating activities			(12,666)	(11,143)
Cash flows from investing activities:
Purchase of fixed assets			(13)	(15)
Net cash used in investing activities			(13)	(15)
Cash flows from financing activities:
Payment of tax liability for vested restricted stock units			(25)	(21)
Proceeds from sale of common stock, net of issuance costs			0	211
Net cash (used in) provided by financing activities			(25)	190
Effect of exchange rate changes on cash and cash equivalents			(1)	(5)
Net decrease in cash and cash equivalents			(12,705)	(10,973)
Cash and cash equivalents, - beginning of period			23,550	43,145
Cash and cash equivalents, - end of period	$ 10,845	$ 32,172	$ 10,845	$ 32,172