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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:              
Net loss $ (2,567,000) $ (9,384,000) $ (2,877,000) $ (4,610,000) $ (11,133,000) $ (11,284,000) $ (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 (608,000)   (1,880,000)   (5,965,000) (1,880,000)  
Change in fair value of contingent consideration 0   0   0 (70,000)  
Issuance and offering costs allocated to liability classified options 0   314,000   430,000 314,000  
Valuation loss on March 2023 PIPE 0   0   6,076,000 0  
Depreciation 89,000   77,000   227,000 354,000  
Amortization of intangible assets         0 39,000  
Lease amortization         535,000 686,000  
Impairment of intangible assets         0 72,000  
Gain on disposal of property and equipment (11,000)   0   (36,000) (386,000)  
Stock-based compensation 162,000   314,000   573,000 897,000  
Bad debt expense         0 32,000  
Gain on sale of Verdeca 0   0   0 (1,138,000)  
Write-down of inventories 252,000   15,000   444,000 1,530,000  
Impairment of property and equipment         0 370,000  
Changes in operating assets and liabilities:              
Accounts receivable and other receivables         249,000 (534,000)  
Inventories         (1,388,000) 1,071,000  
Prepaid expenses and other current assets         (284,000) (90,000)  
Other noncurrent assets         (13,000) 15,000  
Accounts payable and accrued expenses         (300,000) (890,000)  
Amounts due to related parties         (2,000) (17,000)  
Other current liabilities         11,000 6,000  
Operating lease liabilities         (573,000) (718,000)  
Net cash used in operating activities         (11,149,000) (11,621,000) (14,000,000)
CASH FLOWS FROM INVESTING ACTIVITIES:              
Proceeds from sale of property and equipment 5,000   5,000   42,000 897,000  
Proceeds from sale of Verdeca - earn-out received         569,000 285,000  
Purchases of property and equipment         (5,000) (46,000)  
Purchases of investments         (5,002,000) 0  
Net cash (used in) provided by investing activities         (4,396,000) 1,136,000  
CASH FLOWS FROM FINANCING ACTIVITIES:              
Proceeds from ESPP purchases         12,000 7,000  
Net cash provided by financing activities         5,512,000 4,519,000  
Net decrease in cash and cash equivalents         (10,033,000) (5,966,000)  
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 $ 10,611,000   $ 22,719,000   10,611,000 22,719,000 $ 20,644,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:              
Cash paid for interest         0 1,000  
NONCASH INVESTING AND FINANCING ACTIVITIES:              
Right of use assets obtained in exchange for new operating lease liabilities         0 114,000  
Proceeds from sale of Verdeca in accounts and other receivable         0 854,000  
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         212,000 0  
Warrant and option modifications included in Valuation loss on March 2023 PIPE         404,000 0  
August 2022 Offering [Member]              
CASH FLOWS FROM FINANCING ACTIVITIES:              
Proceeds from issuance of common stock, pre-funded warrants and preferred investment options from March 2023 PIPE         0 5,000,000  
Payments of offering costs relating to March 2023 PIPE         0 (488,000)  
August 2022 RDO Securities Purchase Agreement [Member]              
NONCASH INVESTING AND FINANCING ACTIVITIES:              
Common stock options issued to placement agent and included in offering costs         $ 0 $ 191,000