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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (24,156) $ (8,879)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock option compensation expense 3,505 273
Restricted stock compensation expense 406 4
Depreciation expense 167 212
Amortization of right of use assets 25 37
Warrant liability fair value adjustment 2,832 (17,493)
Non-cash interest income (1) (11)
Equitization of expenses 0 1,474
Loss on issuance of financial instruments 0 1,715
Interest expense accrued related to convertible notes 160 74
Debt discount amortization 0 4,467
Changes in assets and liabilities:    
Increase in prepaid expenses and other assets (910) (807)
(Increase) decrease in accounts receivable (36) 497
(Increase) decrease in inventories (201) 204
Decrease in accounts payable and accrued expenses (4,396) (4,350)
Decrease in deferred revenue (263) (479)
Decrease in other liabilities 0 (627)
Net cash used in operating activities (22,868) (23,689)
Cash flows from investing activities:    
Purchase of property, plant and equipment (782) (24)
Net cash used in investing activities (782) (24)
Cash flows from financing activities:    
Net proceeds from the issuance of debt 0 3,719
Principal payments of financing leases (26) (39)
Net payments related to reverse stock split (106) 0
Fees paid related to preferred stock conversions (1) 0
Proceeds from exercise of warrants 1,858 0
Net cash provided by financing activities 42,355 30,305
Foreign currency effects on cash, cash equivalents and restricted cash (132) 14
Net increase in cash, cash equivalents and restricted cash 18,573 6,606
Cash, cash equivalents and restricted cash:    
Beginning of year 10,183 3,577
End of year 28,756 10,183
Supplemental Disclosure of Cash Flow Information:    
Interest expense 11 0
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Conversions of preferred stock into common stock 21 0
Reclassification of 2019 warrants from liability to equity 6,200 0
Equitization of debt, interest and expenses into July 2019 Private Placement 0 12,572
Fair value of warrants issued 0 20,844
Adoption of ASC 842 lease standard 0 1,652
Right of use assets obtained in exchange for lease obligations 729 874
Financing of D&O insurance premium 781 548
Issuance of restricted stock for 2019 bonuses due to executive officers 230 0
IPO [Member]    
Cash flows from financing activities:    
Proceeds on Public Offering (1) [1] 19,378 0
At-the-Market Offering [Member]    
Cash flows from financing activities:    
Fees paid related to preferred stock conversions (44)  
Proceeds on ATM Offering Trades (2) [2] 866 0
IPO 2 [Member]    
Cash flows from financing activities:    
Proceeds on Public Offering (1) [3] 20,386 0
Series D Preferred Stock [Member]    
Cash flows from financing activities:    
Net proceeds from the sale of Series E and E-1 Preferred Stock and warrants 0 150
Series E and E-1 Preferred Stock and Warrants [member]    
Cash flows from financing activities:    
Net proceeds from the sale of Series E and E-1 Preferred Stock and warrants $ 0 $ 26,475
[1] May 2020 Public Offering gross proceed were $21,996, with issuance costs of $2,618
[2] ATM offering gross proceeds were $910, with issuances costs and fees of $44
[3] December 2020 Public Offering gross proceeds were $22,247, with issuance costs of $1,861