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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (9,384,000) $ (4,610,000) $ (15,600,000)
Adjustments to reconcile net loss to cash used in operating activities:      
Change in fair value of common stock warrant and option liabilities (940,000) 0  
Change in fair value of contingent consideration 0 (31,000)  
Issuance and offering costs allocated to liability classified options 430,000 0  
Valuation loss on March 2023 PIPE 6,076,000 0  
Depreciation 71,000 149,000  
Amortization of intangible assets 0 13,000  
Lease amortization 180,000 166,000  
Gain on disposal of property and equipment (19,000) (328,000)  
Stock-based compensation 212,000 260,000  
Write-down of inventories 23,000 368,000  
Changes in operating assets and liabilities:      
Accounts receivable and other receivables 80,000 (1,398,000)  
Inventories (37,000) 669,000  
Prepaid expenses and other current assets 203,000 208,000  
Other noncurrent assets 0 22,000  
Accounts payable and accrued expenses (149,000) (198,000)  
Amounts due to related parties (33,000) 5,000  
Other current liabilities 12,000 0  
Operating lease liabilities (191,000) (180,000)  
Net cash used in operating activities (3,466,000) (4,885,000) (14,000,000.0)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Proceeds from sale of property and equipment 30,000 787,000  
Proceeds from sale of Verdeca - earn-out received 285,000 0  
Purchases of property and equipment 0 (40,000)  
Net cash provided by investing activities 315,000 747,000  
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from ESPP purchases 5,000 4,000  
Net cash provided by financing activities 5,505,000 4,000  
Net (decrease) increase in cash and cash equivalents 2,354,000 (4,134,000)  
Cash and cash equivalents - beginning of period 20,644,000 28,685,000 28,685,000
Cash and cash equivalents - end of period 22,998,000 24,551,000 $ 20,644,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:      
Cash paid for interest 0 1,000  
NONCASH INVESTING AND FINANCING ACTIVITIES:      
Proceeds from sale of Verdeca in accounts and other receivable 285,000 0  
Accounting Standards Update 2020-06 [Member]      
NONCASH INVESTING AND FINANCING ACTIVITIES:      
Common stock warrant liabilities reclassifed to equity upon adoption of ASU 2020-06 3,392,000  
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 5,997,000 0  
Payments of offering costs relating to March 2023 PIPE (497,000) 0  
NONCASH INVESTING AND FINANCING ACTIVITIES:      
Accrued legal and accounting fees included in offering costs related to March 2023 PIPE 51,000 0  
Common stock options issued to placement agent and included in offering costs related to March 2023 PIPE securities purchase agreement 212,000 0  
Warrant and option modifications included in Valuation loss on March 2023 PIPE $ 404,000 $ 0