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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:              
Net loss $ 818,000 $ (9,384,000) $ (3,797,000) $ (4,610,000) $ (8,566,000) $ (8,407,000) $ (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 (4,416,000)   0   (5,357,000) 0  
Change in fair value of contingent consideration 0   (39,000)   0 (70,000)  
Issuance and offering costs allocated to liability classified options 0   0   430,000 27,000  
Valuation loss on March 2023 PIPE 0   0   6,076,000 0  
Depreciation 67,000   128,000   138,000 277,000  
Amortization of intangible assets         0 26,000  
Lease amortization         357,000 420,000  
Impairment of intangible assets 0   72,000   0 72,000  
Gain on disposal of property and equipment (7,000)   (58,000)   (26,000) (386,000)  
Stock-based compensation 199,000   323,000   411,000 583,000  
Bad debt expense         0 37,000  
Gain on sale of Verdeca 0   (1,138,000)   0 (1,138,000)  
Write-down of inventories 169,000   1,100,000   192,000 1,515,000  
Impairment of property and equipment 0   346,000   0 346,000  
Changes in operating assets and liabilities:              
Accounts receivable and other receivables         87,000 (1,333,000)  
Inventories         (1,316,000) 1,001,000  
Prepaid expenses and other current assets         (142,000) (541,000)  
Other noncurrent assets         (13,000) 15,000  
Accounts payable and accrued expenses         (149,000) (247,000)  
Amounts due to related parties         (16,000) 19,000  
Other current liabilities         12,000 8,000  
Other noncurrent liabilities         0 (1,000)  
Operating lease liabilities         (382,000) (446,000)  
Net cash used in operating activities         (8,264,000) (8,250,000) (14,000,000)
CASH FLOWS FROM INVESTING ACTIVITIES:              
Proceeds from sale of property and equipment 7,000   54,000   37,000 841,000  
Proceeds from sale of Verdeca - earn-out received         569,000 0  
Purchases of property and equipment         (5,000) (46,000)  
Purchases of investments         (5,002,000) 0  
Net cash used by investing activities         (4,401,000) 795,000  
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 in cash and cash equivalents         (7,160,000) (7,451,000)  
Cash and cash equivalents - beginning of period   $ 20,644,000   $ 28,685,000 20,644,000 28,685,000 28,685,000
Cash and cash equivalents - end of period $ 13,484,000   $ 21,234,000   13,484,000 21,234,000 $ 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 property and equipment in accounts receivable and other receivables         2,000 51,000  
Accounting Standards Update 2020-06 [Member]              
NONCASH INVESTING AND FINANCING ACTIVITIES:              
Common stock warrant liabilities reclassified to equity upon adoption of ASU 2020-06         0 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:              
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