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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating Activities:    
Net Income (Loss) $ (4,189) $ (17,441)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 105 147
Stock-based compensation expense 1,539 2,384
Loss on extinguishment of convertible notes 185 0
Amortization of debt discount 1,939 374
Loss on disposal of property and equipment 10 9
Impairment of property and equipment 0 100
Change in fair value of derivative liabilities (418) 0
Change in fair value of warrant liabilities (13,915) (864)
Changes in operating assets and liabilities:    
Income tax receivable 8 0
Prepaid expenses and other current assets 728 772
Accounts payable 1,806 (184)
Accrued expenses and other current liabilities (83) 3,057
Other long-term liabilities (211) (452)
Net cash used in operating activities (12,496) (12,098)
Investing Activities:    
Purchases of property and equipment (15) (16)
Proceeds from sale of property and equipment 20 10
Proceeds from sale of investment in Enumera Molecular, Inc. 3,000 0
Net cash provided by (used in) investing activities 3,005 (6)
Financing Activities:    
Proceeds from issuance of common stock 2,800 12,883
Proceeds from issuance of convertible notes, net 2,813 0
Payments of offering costs (70) (359)
Payments for financing of insurance premiums (443) (443)
Net cash provided by financing activities 5,100 12,081
Net decrease in cash, cash equivalents and restricted cash (4,391) (23)
Cash, cash equivalents and restricted cash at beginning of period 15,211 30,486
Cash, cash equivalents and restricted cash at end of period 10,820 30,463
Supplemental disclosure of cash flow information:    
Cash paid for interest 78 0
Supplemental schedule of non-cash investing and financing activities:    
Exchange of convertibles note for senior secured notes and warrants 5,625 0
Lease assets obtained in exchange for operating lease liabilities 0 1,133
Debt issuance costs incurred but not paid 314 0
Purchases of property and equipment in accounts payable $ 107 $ 0