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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net loss $ (16,202) $ (19,159)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 3,322 4,390
Depreciation expense 59 31
Warrant liability fair value adjustment (1,160) 0
Non-cash lease expense 195 234
Amortization of debt discount 388 380
Interest expense accrued related to convertible notes 80 80
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (306) 374
Accounts receivable 239 (394)
Inventory (482) (628)
Accounts payable and accrued expenses 132 2,667
Other liabilities, non-current (177) (217)
Deferred revenue 0 (170)
Net cash used in operating activities (13,912) (12,412)
Cash flows from investing activities:    
Purchase of property, plant and equipment (40) (141)
Net cash used in investing activities (40) (141)
Cash flows from financing activities:    
Net proceeds from private placement 22,960 0
Proceeds from the issuance of common stock relating to the employee stock purchase plan 47 0
Repayment of debt (6,313) 0
Proceeds from exercise of warrants 5 0
Proceeds from exercise of stock options 2 0
Net cash provided by financing activities 16,701 0
Foreign currency effects on cash 19 (46)
Net increase (decrease) in total cash 2,768 (12,599)
Total Cash, Cash Equivalents and Restricted Cash:    
Beginning of period 11,822 26,953
End of period 14,590 14,354
Cash, Cash Equivalents and Restricted Cash consisted of the following:    
Cash 14,540 10,203
Restricted Cash 50 4,151
Total cash, cash equivalents and restricted cash shown in the statements of cash flows 14,590 14,354
Cash paid during the periods for:    
Interest expense 787 842
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