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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (8,203) $ (6,747)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 1,474 2,148
Depreciation expense 31 39
Non-cash lease expense 97 155
Amortization of debt discount 194  
Interest expense accrued related to convertible notes 40 39
Changes in assets and liabilities:    
Decrease in prepaid expenses and other assets 39 301
Increase in accounts receivable (134) (18)
Increase in inventories (599) (254)
Increase in accounts payable and accrued expenses 953 164
Decrease in lease liabilities (97) (155)
Decrease in deferred revenue (170) (239)
Net cash used in operating activities (6,375) (4,567)
Cash flows from investing activities:    
Purchase of property, plant and equipment (89) (9)
Net cash used in investing activities (89) (9)
Cash flows from financing activities:    
Net proceeds from the exercise of warrants   2,376
Net cash provided by financing activities   2,376
Foreign currency effects on cash 2 94
Net decrease in total cash (6,462) (2,106)
Total Cash:    
Beginning of period 26,953 28,756
End of period 20,491 26,650
Cash 16,340 26,600
Restricted Cash 4,151 50
Total 20,491 26,650
Supplemental Disclosure of Cash Flow Information:    
Interest expense $ 411 3
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Issuance of restricted stock for accrued fees due to a former board member   $ 57