Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (2,423,000)	$ (9,384,000)	$ (14,000,000)
Adjustments to reconcile net loss to cash used in operating activities:
Change in fair value of common stock warrant and option liabilities	(593,000)	(940,000)
Issuance and offering costs allocated to liability classified options	0	430,000
Valuation loss on March 2023 PIPE	0	6,076,000
Depreciation	51,000	71,000
Lease amortization	177,000	180,000
Loss (Gain) on disposal of property and equipment	2,000	(19,000)
Stock-based compensation	138,000	212,000
Write-down of inventories	0	23,000
Impairment of property and equipment	36,000	0
Changes in operating assets and liabilities:
Accounts receivable and other receivables	(246,000)	80,000
Inventories	303,000	(37,000)
Prepaid expenses and other current assets	275,000	203,000
Accounts payable and accrued expenses	(678,000)	(149,000)
Amounts due to related parties	17,000	(33,000)
Other current liabilities	0	12,000
Operating lease liabilities	(269,000)	(191,000)
Net cash used in operating activities	(3,210,000)	(3,466,000)	15,300,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sale of property and equipment	17,000	30,000
Purchases of property and equipment	(13,000)	0
Proceeds from sale of Verdeca - earn-out received	0	285,000
Net cash provided by investing activities	4,000	315,000
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from ESPP purchases	5,000	5,000
Net cash provided by financing activities	5,000	5,505,000
Net (decrease) increase in cash and cash equivalents	(3,201,000)	2,354,000
Cash and cash equivalents - beginning of period	6,518,000	20,644,000	20,644,000
Cash and cash equivalents - end of period	3,317,000	22,998,000	$ 6,518,000
NONCASH INVESTING AND FINANCING ACTIVITIES:
Proceeds from sale of property and equipment in accounts receivable and other receivables	12,000	0
Purchases of property and equipment in accounts payable and accrued expenses	13,000	0
Right of use assets obtained in exchange for new operating lease liabilities	86,000	0
Proceeds from sale of Verdeca in accounts receivable and other receivables	0	285,000
March 2023 PIPE [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, pre-funded warrants and preferred investment options from March 2023 PIPE	0	5,997,000
Payments of offering costs relating to March 2023 PIPE	0	(497,000)
NONCASH INVESTING AND FINANCING ACTIVITIES:
Accrued legal and accounting fees included in offering costs related to March 2023 PIPE	0	51,000
Common stock options issued to placement agent and included in offering costs	0	212,000
Warrant and option modifications included in Valuation loss on March 2023 PIPE	$ 0	$ 404,000