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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ (47,678) $ (36,508)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 8,151 7,941
Depreciation expense 128 132
Warrant liability fair value adjustment 7,998 0
Non-cash lease expense 271 443
Amortization of debt discount 776 768
Interest expense accrued related to convertible notes 160 160
Amortization of premiums and discounts on marketable securities (151) 0
Changes in assets and liabilities:    
Prepaid expenses and other assets 1,029 774
Accounts receivable 125 (322)
Inventory (1,324) (587)
Accounts payable and accrued expenses (199) 1,798
Other liabilities, non-current (537) 621
Deferred revenue 0 (170)
Net cash used in operating activities (31,251) (24,950)
Cash flows from investing activities:    
Purchases of investments (19,651) 0
Sales and maturities of investments 0 0
Purchase of property, plant and equipment (58) (209)
Net cash used in investing activities (19,709) (209)
Cash flows from financing activities:    
Net proceeds from private placement 22,960 10,857
Proceeds from the issuance of common stock relating to the employee stock purchase plan 123 0
Repayment of Debt (6,313) (714)
Proceeds from the exercise of warrants 35,004 0
Proceeds from the exercise of stock options 4 0
Net cash provided by financing activities 51,778 10,143
Foreign currency effects on cash 56 (115)
Net increase (decrease) in total cash 874 (15,131)
Total Cash, Cash Equivalents and Restricted Cash:    
Beginning of period 11,822 26,953
End of period 12,696 11,822
Cash, Cash Equivalents and Restricted Cash consisted of the following:    
Cash 12,646 7,671
Restricted Cash 50 4,151
Total 12,696 11,822
Cash paid during the periods for:    
Interest expense 1,459 1,873
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Right of use assets obtained in exchange for lease obligations 84 86
Conversion of mezzanine equity to common shares 11,269 0
Conversion of mezzanine equity to preferred shares $ 7,099 $ 0