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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net loss $ (36,508) $ (25,649)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 7,941 7,832
Depreciation expense 132 146
Non-cash lease expense 443 322
Amortization of debt discount 768 323
Interest expense accrued related to convertible notes 160 186
Changes in assets and liabilities:    
Decrease in prepaid expenses and other assets 774 813
(Increase) decrease in accounts receivable (322) 13
Increase in inventories (587) (557)
Increase (decrease) in accounts payable and accrued expenses 1,798 (3,284)
Increase (decrease) in other liabilities, non-current 621 (322)
Decrease in deferred revenue (170) (2,427)
Net cash used in operating activities (24,950) (22,604)
Cash flows from investing activities:    
Purchase of property, plant and equipment (209) (143)
Net cash used in investing activities (209) (143)
Cash flows from financing activities:    
Net proceeds from private placement 10,857 0
Net proceeds from ATM Offering 3,923
Net proceeds from debt financing 0 14,437
Proceeds from the exercise of stock options 4
Proceeds from the exercise of warrants 0 2,458
Payment of loan payable (714)  
Net cash provided by financing activities 10,143 20,822
Foreign currency effects on cash (115) 122
Net decrease in total cash (15,131) (1,803)
Total Cash, Cash Equivalents and Restricted Cash:    
Beginning of period 26,953 28,756
End of period 11,822 26,953
Cash 7,671 22,802
Restricted Cash 4,151 4,151
Total 11,822 26,953
Supplemental Disclosure of Cash Flow Information:    
Interest expense 1,873 681
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Issuance of restricted stock for accrued fees due to a former board member 0 57
Proceeds allocated to warrant 0 1,171
Financing of D&O insurance premium   886
Right of use assets obtained in exchange for lease obligations $ 86 $ 0