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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (36,542) $ (28,036)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 6,152 6,016
Depreciation expense 87 98
Warrant liability fair value adjustment 8,224 0
Non-cash lease expense 262 339
Amortization of debt discount 582 574
Interest expense accrued related to convertible notes 120 120
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (743) 708
Accounts receivable 161 (493)
Inventory (669) (515)
Accounts payable and accrued expenses (437) 2,907
Other liabilities, non-current (270) 861
Deferred revenue 0 (170)
Net cash used in operating activities (23,073) (17,591)
Cash flows from investing activities:    
Purchase of property, plant and equipment (39) (209)
Net cash used in investing activities (39) (209)
Cash flows from financing activities:    
Net proceeds from private placement 22,960 4,896
Proceeds from the issuance of common stock relating to the employee stock purchase plan 123 0
Repayment of debt (6,313) 0
Proceeds from exercise of warrants 35,004 0
Proceeds from exercise of stock options 3 0
Net cash provided by financing activities 51,777 4,896
Foreign currency effects on cash 25 (67)
Net increase (decrease) in total cash 28,690 (12,971)
Total Cash, Cash Equivalents and Restricted Cash:    
Beginning of period 11,822 26,953
End of period 40,512 13,982
Cash, Cash Equivalents and Restricted Cash consisted of the following:    
Cash 40,462 9,831
Restricted Cash 50 4,151
Total cash, cash equivalents and restricted cash shown in the statements of cash flows 40,512 13,982
Cash paid during the periods for:    
Interest expense 1,122 1,337
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Right of use assets obtained in exchange for lease obligations 84 0
Conversion of mezzanine equity to common shares 11,269 0
Conversion of mezzanine equity to preferred shares $ 7,099 $ 0