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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (4,917) $ (921)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1 1
Stock-based compensation 109 71
Warrant modification expense 1,627
Change in fair value of derivative liabilities 1,948
Changes in operating assets and liabilities:    
Trade receivable (1) (24)
Other accounts receivable and prepaid expenses 87 43
Inventory (28) 10
Other assets 2
Trade payables (43) 98
Other accounts payable and accrued expenses (231) (155)
Other liabilities 390
Deferred revenue 105
Accrued severance pay, net (3) (18)
Net cash used in operating activities (954) (895)
Cash flows from investing activities:    
Purchases of property plant and equipment (2)
Net cash used in investing activities (2)
Cash flows from financing activities:    
Proceeds from exercise of warrants 1,406
Net cash provided by financing activities 1,406
Effects of currency translation on cash and cash equivalents (5)
Net increase in cash, cash equivalents and restricted cash 445 (895)
Cash, cash equivalents and restricted cash at beginning of period 7,533 1,338
Cash, cash equivalents and restricted cash at end of period 7,978 443
Supplemental non-cash financing and investing activities:    
Shares issued from exercise of warrants previously classified as derivatives 2,088
Reclass liability to equity due to increase in authorized shares $ 3,337