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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (20,302) $ (17,127)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 6,224 25
Restricted stock compensation expense   406
Depreciation expense 115 125
Amortization of right of use assets   26
Amortization of original issue discount costs 127  
Warrant liability fair value adjustment   2,832
Interest expense accrued related to convertible notes 119 120
Changes in assets and liabilities:    
Decrease (increase) in prepaid expenses and other assets 676 (100)
Increase in accounts receivable (12) (82)
Increase in inventories (383) (185)
Increase in deferred offering costs   (268)
Decrease in accounts payable (588) (3,032)
Decrease in accrued expenses (1,652) (312)
Decrease in deferred revenue (517) (256)
Net cash used in operating activities (16,193) (17,828)
Cash flows from investing activities:    
Purchase of property, plant and equipment (144) (708)
Net cash used in investing activities (144) (708)
Cash flows from financing activities:    
Principal payments on financing leases   (26)
Net payments related to registration costs   (106)
Net proceeds from Public Offering   19,377
Principal payments on D&O insurance financing (382) (440)
Net proceeds from debt financing 14,437  
Net proceeds from the exercise of warrants 2,458 601
Net cash provided by financing activities 16,513 19,472
Foreign currency effects on cash 84 (39)
Net increase in total cash 260 897
Total Cash, Cash Equivalents and Restricted Cash:    
Beginning of period 28,756 10,183
End of period 29,016 11,080
Supplemental Disclosure of Cash Flow Information:    
Interest expense 260 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 20
Right of use assets obtained in exchange for lease obligations 192 729
Board of Directors Chairman [Member]    
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Issuance of restricted stock for accrued fees due to a former board member $ 57  
At the Market Offering [Member]    
Cash flows from financing activities:    
Gross proceeds from ATM Offering   70
Issuance costs related to ATM Offering   $ (4)