Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash flows from operating activities
Net loss	$ (12,697)	$ (7,096)
Adjustments to reconcile net loss to net cash used in operating activities
Amortization of deferred financing costs	27	4
Change in fair value of convertible notes (issued, converted and outstanding)	5,758	2,218
Change in fair value of forward purchase agreement derivative liability	0	(100)
Change in fair value of liability classified warrants (exercised and outstanding)	2,846	(36)
Stock-based compensation	434	505
Changes in operating assets and liabilities
Other receivables	0	12
Prepaid expenses	614	318
Other assets	2	0
Accounts payable	(493)	1,095
Accrued expenses	21	0
Other liabilities	0	786
Net cash used in operating activities	(3,488)	(2,294)
Cash flows from financing activities
Proceeds from issuance of convertible notes	979	3,000
Payment of convertible notes	0	(10)
Proceeds from issuance of shares	4,543	1,108
Proceeds from exercise of convertible note warrants	853	0
Proceeds of Pre-Funded warrants	3,769	0
Payment of commitment fee - equity line of credit	0	(500)
Proceeds from sale of recycled shares	0	1,870
Proceeds from notes payable	0	100
Payment of notes payable	(1,813)	(2,596)
Net cash provided by financing activities	8,331	2,972
Net increase in cash	4,843	678
Cash, beginning of period	176	47	$ 47
Cash, end of period	5,019	725	$ 176
Supplemental disclosure of cash flow information
Cash paid for interest	0	508
Exercise of pre-funded warrants	3,106	0
Shares issued as payment of convertible notes	9,387	0
Issuance of convertible note warrants	$ 586	$ 500