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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (13,986,000) | $ (15,612,000)
Adjustments to reconcile net loss to cash used in operating activities: |  |
Change in fair value of common stock warrant and option liabilities | (6,544,000) | (3,209,000)
Change in fair value of contingent consideration | 0 | (70,000)
Issuance and offering costs allocated to liability classified options | 430,000 | 314,000
Valuation loss on March 2023 PIPE | 6,076,000 | 0
Depreciation | 287,000 | 439,000
Amortization of intangible assets | 0 | 40,000
Lease amortization | 697,000 | 884,000
Impairment of intangible assets | 0 | 404,000
Gain on disposal of equipment | (40,000) | (314,000)
Stock-based compensation | 717,000 | 1,106,000
Bad debt expense | 20,000 | 60,000
Gain on sale of Verdeca | 0 | (1,138,000)
Write-down of inventories | 444,000 | 2,471,000
Impairment of property and equipment | 0 | 530,000
Impairment of ROU asset | 113,000 | 0
Changes in operating assets and liabilities: |  |
Accounts receivable and other receivables | 184,000 | 592,000
Inventories | (2,419,000) | 1,118,000
Prepaid expenses and other current assets | 1,000 | 91,000
Other noncurrent assets | 2,000 | 16,000
Accounts payable and accrued expenses | (522,000) | (757,000)
Amounts due to related parties | 10,000 | (16,000)
Other current liabilities | 0 | 6,000
Operating lease payments | (764,000) | (932,000)
Net cash used in operating activities | (15,294,000) | (13,977,000)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Proceeds from sale of property and equipment | 115,000 | 920,000
Proceeds from sale of Verdeca - earn-out received | 569,000 | 569,000
Proceeds from sale of investments | 2,502,000 | 0
Purchases of property and equipment | (5,000) | (72,000)
Purchases of investments | (7,525,000) | 0
Net cash (used in) provided by investing activities | (4,344,000) | 1,417,000
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 | (14,126,000) | (8,041,000)
Cash and cash equivalents - beginning of period | 20,644,000 | 28,685,000
Cash and cash equivalents - end of period | 6,518,000 | 20,644,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: |  |
Cash paid for interest | 0 | 1,000
NONCASH TRANSACTIONS: |  |
Right of use assets obtained in exchange for new operating lease liabilities | 0 | 114,000
Proceeds from sale of property and equipment in accounts receivable and other receivables | 8,000 | 19,000
Proceeds from sale of Verdeca in accounts receivable and other receivables | 0 | 569,000
Accounting Standards Update 2020-06 [Member] |  |
NONCASH TRANSACTIONS: |  |
Common stock warrant liabilities reclassified to equity upon adoption of ASU 2020-06 | 0 | 3,392,000
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 TRANSACTIONS: |  |
Common stock options issued to placement agent and included in offering costs | 0 | 191,000
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 TRANSACTIONS: |  |
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

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