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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:        
Net loss $ (9,657) $ (6,430) $ (17,860) $ (13,177)
Adjustments to reconcile net loss to net cash used in operating activities:        
Stock option compensation expense     3,091 3,774
Depreciation expense     31 78
Non-cash lease expense     234 0
Amortization of debt discount     380  
Interest expense accrued related to convertible notes     80 79
Changes in assets and liabilities:        
Decrease in prepaid expenses and other assets     374 485
Increase in accounts receivable     (394) (17)
Increase in inventories     (628) (366)
Increase (decrease) in accounts payable and accrued expenses     2,667 (2,036)
Decrease in lease liabilities     (217) (155)
Decrease in deferred revenue     (170) (334)
Net cash used in operating activities     (12,412) (11,669)
Cash flows from investing activities:        
Purchase of property, plant and equipment     (141) (88)
Net cash used in investing activities     (141) (88)
Cash flows from financing activities:        
Net proceeds from the exercise of warrants       2,393
Net cash provided by financing activities       2,393
Foreign currency effects on cash     (46) 33
Net decrease in total cash     (12,599) (9,331)
Total Cash:        
Beginning of period     26,953 28,756
End of period 14,354 19,425 14,354 19,425
Cash 10,203 19,274 10,203 19,274
Restricted Cash 4,151 151 4,151 151
Total $ 14,354 $ 19,425 14,354 19,425
Supplemental Disclosure of Cash Flow Information:        
Interest expense     $ 842 4
Supplemental Disclosure of Non-Cash Investing and Financing Activities:        
Issuance of restricted stock for accrued fees due to a former board member       57
Conversions of preferred stock into common stock       $ 9