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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (11,111) $ (9,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 2,945 1,661
Depreciation expense 29 30
Warrant liability fair value adjustment 612 0
Non-cash lease expense 13 100
Amortization of debt discount 261 194
Interest expense accrued related to convertible notes 40 27
Amortization of premiums and discounts on marketable securities (229) 0
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (174) 14
Accounts receivable (1,323) (92)
Inventory (312) (339)
Accounts payable and accrued expenses (507) 3,221
Other liabilities, non-current 172 (80)
Deferred revenue 0 0
Net cash used in operating activities (9,584) (4,264)
Cash flows from investing activities:    
Purchase of investment (10,327) 0
Maturities of investments 15,000 0
Purchase of property, plant and equipment (13) 0
Net cash provided by investing activities 4,660 0
Cash flows from financing activities:    
Proceeds from private placement 7,000 22,960
Proceeds from the issuance of common stock relating to the employee stock purchase plan 75 47
Repayment of debt (3,054) (6,313)
Proceeds from exercise of warrants 0 0
Proceeds from exercise of stock options 0 0
Net cash provided by financing activities 4,021 16,694
Foreign currency effects on cash 17 20
Net (decrease) increase in total cash (886) 12,450
Total Cash, Cash Equivalents and Restricted Cash:    
Beginning of period 12,696 11,822
End of period 11,810 24,272
Cash, Cash Equivalents and Restricted Cash consisted of the following:    
Cash and Cash Equivalents 11,760 24,222
Restricted Cash 50 50
Total cash, cash equivalents and restricted cash shown in the statements of cash flows 11,810 24,272
Cash paid during the periods for:    
Interest expense 250 491
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Right of use assets obtained in exchange for lease obligations $ 1,029 $ 0