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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (13,177) $ (12,136)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 3,774 25
Restricted stock compensation expense   635
Depreciation expense 78 92
Amortization of right of use assets   22
Warrant liability fair value adjustment   2,832
Interest expense accrued related to convertible notes 79 80
Changes in assets and liabilities:    
Decrease (increase) in prepaid expenses and other assets 485 (232)
Increase in accounts receivable (17) (125)
Increase in inventories (366) (70)
Decrease in accounts payable (550) (2,359)
Decrease in accrued expenses (1,641) (1,598)
Decrease in deferred revenue (334) (248)
Net cash used in operating activities (11,669) (13,082)
Cash flows from investing activities:    
Purchase of property, plant and equipment (88) (221)
Net cash used in investing activities (88) (221)
Cash flows from financing activities:    
Principal payments on financing leases   (23)
Net payments related to registration costs   (106)
Net proceeds from Public Offering   19,378
Net proceeds from the exercise of warrants 2,393  
Net cash provided by financing activities 2,393 19,249
Foreign currency effects on cash 33 63
Net (decrease) / increase in total cash (9,331) 6,009
Total Cash:    
Beginning of period 28,756 10,183
End of period 19,425 16,192
Supplemental Disclosure of Cash Flow Information:    
Interest expense 4 7
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Reclassification of 2019 warrants from liability to equity   6,199
Conversions of preferred stock into common stock 9 $ 15
Board of Directors Chairman    
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Issuance of restricted stock for accrued fees due to a former board member $ 57