Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities:
Net loss	$ (12,854,000)	$ (6,105,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Change in fair value of rights from Private Placement	3,832,000	(1,221,000)
Change in fair value of notes payable	9,000	13,000
Non-cash stock-based compensation	846,000	2,924,000
Non-cash operating lease expense	403,000	359,000
Depreciation and amortization	0	4,000
Common stock issued for services	469,000	41,000
Gain on disposal of asset	0	(92,000)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(236,000)	206,000
Accounts payable	3,790,000	(529,000)
Accrued expenses and other current liabilities	(1,027,000)	(1,654,000)
Operating lease liability	(466,000)	(409,000)
License receivable	0	(5,000,000)
Deferred revenue	0	(442,000)
Net cash used in operating activities	(5,234,000)	(11,905,000)
Investing activities:
Proceeds from sale of property and equipment	0	303,000
Net cash provided by investing activities	0	303,000
Financing activities:
Proceeds from private placement	0	5,479,000
Proceeds from issuance of common stock and pre-funded warrants	500,000	752,000
Proceeds from exercise of warrants	1,000	17,000
Repayments of notes payable	(150,000)	0
Repayments of finance lease liabilities	0	(19,000)
Net cash provided by financing activities	351,000	6,229,000
Net change in cash and restricted cash	(4,883,000)	(5,373,000)
Cash and restricted cash at beginning of year	5,858,000	13,268,000
Cash and restricted cash at end of year	975,000	7,895,000
Components of cash and restricted cash:
Cash	900,000	7,770,000
Restricted cash	75,000	125,000
Total cash and restricted cash	975,000	7,895,000
Supplemental disclosure of cash flow information:
Cash paid for interest	19,000	25,000
Supplemental disclosure of noncash investing and financing activities:
Withholding to cover taxes from RSU vesting	$ 0	$ 69,000