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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net loss $ (22,988) $ (36,542)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 8,155 6,152
Depreciation expense 96 87
Warrant liability fair value adjustment 7,392 8,224
Amortization of Right-of-Use Asset 64 262
Amortization of debt discount 460 582
Interest expense accrued related to convertible notes 120 120
Amortization of premiums and discounts on marketable securities (450) 0
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (353) (743)
Accounts receivable (6,695) 161
Inventory (3,320) (669)
Accounts payable and accrued expenses 120 (437)
Other liabilities, non-current (276) (270)
Net cash used in operating activities (17,675) (23,073)
Cash flows from investing activities:    
Purchase of investment (31,767) 0
Maturities of investments 46,344 0
Purchase of property, plant and equipment (330) (39)
Net cash provided by (used in) investing activities 14,247 (39)
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 250 123
Repayment of debt (8,610) (6,313)
Proceeds from exercise of warrants 259 35,004
Proceeds from exercise of stock options 355 3
Net cash (used in) provided by financing activities (975) 51,777
Foreign currency effects on cash 22 25
Net (decrease) increase in total cash (4,381) 28,690
Total Cash, Cash Equivalents and Restricted Cash:    
Beginning of period 12,696 11,822
End of period 8,315 40,512
Cash, Cash Equivalents and Restricted Cash consisted of the following:    
Cash and Cash Equivalents 8,315 40,462
Restricted Cash 0 50
Total 8,315 40,512
Cash paid during the periods for:    
Interest expense 389 1,122
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