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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net loss $ (26,365) $ (20,302)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 4,345 6,224
Depreciation expense 98 115
Non-cash lease expense 339 0
Amortization of debt discount 574 127
Interest expense accrued related to convertible notes 120 119
Changes in assets and liabilities:    
Decrease in prepaid expenses and other assets 708 676
Increase in accounts receivable (493) (12)
Increase in inventories (515) (383)
Increase (decrease) in accounts payable and accrued expenses 2,907 (2,622)
Increase in other liabilities, non-current 861 0
Decrease in deferred revenue (170) (517)
Net cash used in operating activities (17,591) (16,575)
Cash flows from investing activities:    
Purchase of property, plant and equipment (209) (144)
Net cash used in investing activities (209) (144)
Cash flows from financing activities:    
Net proceeds from private placement 4,896 0
Net procceds from debt financing 0 14,437
Net proceeds from the exercise of warrants 0 2,458
Net cash provided by financing activities 4,896 16,895
Foreign currency effects on cash (67) 84
Net (decrease) increase in total cash (12,971) 260
Total Cash, Cash Equivalents and Restricted Cash:    
Beginning of period 26,953 28,756
End of period 13,982 29,016
Cash 9,831 24,865
Restricted Cash 4,151 4,151
Total 13,982 29,016
Supplemental Disclosure of Cash Flow Information:    
Interest expense 1,337 260
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Issuance of restricted stock for accrued fees due to a former board member 0 57
Right of use assets obtained in exchange for lease obligations 0 192
Conversions of preferred stock into common stock $ 0 $ 9