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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (24,852) $ (16,202)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 6,014 3,322
Depreciation expense 62 59
Warrant liability fair value adjustment 10,367 (1,160)
Non-cash lease expense 37 195
Amortization of debt discount 447 388
Interest expense accrued related to convertible notes 80 80
Amortization of premiums and discounts on marketable securities (379) 0
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (488) (306)
Accounts receivable (3,485) 239
Inventory (2,994) (482)
Accounts payable and accrued expenses 1,339 132
Other liabilities, non-current (183) (177)
Net cash used in operating activities (14,035) (13,912)
Cash flows from investing activities:    
Purchase of investment (20,482) 0
Maturities of investments 35,540 0
Purchase of property, plant and equipment (114) (40)
Net cash provided by (used in) investing activities 14,944 (40)
Cash flows from financing activities:    
Net proceeds from private placement 6,771 22,960
Proceeds from the issuance of common stock relating to the employee stock purchase plan 75 47
Repayment of debt (6,107) (6,313)
Proceeds from exercise of warrants 259 5
Proceeds from exercise of stock options 169 2
Net cash provided by financing activities 1,167 16,701
Foreign currency effects on cash 10 19
Net increase in total cash 2,086 2,768
Total Cash, Cash Equivalents and Restricted Cash:    
Beginning of period 12,696 11,822
End of period 14,782 14,590
Cash, Cash Equivalents and Restricted Cash consisted of the following:    
Cash and Cash Equivalents 14,782 14,540
Restricted Cash 0 50
Total 14,782 14,590
Cash paid during the periods for:    
Interest expense 375 787
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Right of use assets obtained in exchange for lease obligations 1,029 84
Conversion of mezzanine equity to common shares 0 11,269
Conversion of mezzanine equity to preferred shares $ 0 $ 7,099