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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows used in operating activities:      
Net loss $ (12,976) $ (15,551) $ (21,675)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation 285 321 463
Share-based compensation to employees and non-employees 749 1,108 2,766
Deferred taxes (44) (57) (107)
Gain on PPP forgiveness (392)
Loss on inducement of debt [1] 600
Financial expenses related to long term loan 224
Changes in assets and liabilities:      
Trade receivables, net 110 (36) 322
Prepaid expenses, operating lease right-of-use assets and other assets 166 64 734
Inventories (469) (1,221) 1,403
Trade payables (506) 370 492
Employees and payroll accruals 197 20 (222)
Deferred revenues and advance from customers 264 176 283
Operating lease liabilities and other liabilities 27 (9) (57)
Net cash used in operating activities (12,589) (14,815) (14,774)
Cash flows used in investing activities:      
Purchase of property and equipment (73) (22) (13)
Net cash used in investing activities (73) (22) (13)
Cash flows from financing activities:      
Repayment of long-term loan (6,965) (1,722) (3,866)
Proceeds from PPP loan [2] 392  
Issuance of ordinary shares in investment agreement, net of issuance expenses in an amount of $830 [3] 4,295
Issuance of ordinary shares in at-the-market offering, net of issuance expenses paid in the amount of $211 [3] 1,142
Issuance of ordinary shares and exercise of pre-funded warrants into ordinary shares in follow-on offering, net of issuance expenses in an amount of $1,505 and net of long-term loan conversion in the amount of $3,600 [1],[3] 8,140
Issuance of ordinary shares in a "best effort" offering, net of issuance expenses in the amount of $686 3,684
Issuance of ordinary shares in a "registered direct" offering, net of issuance expenses in the amount of $1,035 8,125
Issuance of ordinary shares in a "best effort" offering, net of issuance expenses in the amount of $1,056 [3] 4,010
Issuance of ordinary shares in a "registered direct" offering, net of issuance expenses in the amount of $977 [3] 8,023
Issuance of ordinary shares in a "warrant exercise" agreement, net of issuance expenses in the amount of $1,019 [3] 9,966
Issuance of ordinary shares in a private placement, net of issuance expenses in the amount of $959 [3] 7,041
Exercise of pre-funded warrants and warrants [3] 4,223 1,429
Net cash provided by financing activities 16,724 21,482 9,711
Increase (decrease) in cash, cash equivalents, and restricted cash 4,062 6,645 (5,076)
Cash, cash equivalents, and restricted cash at beginning of period 16,992 10,347 15,423
Cash, cash equivalents, and restricted cash at end of period 21,054 16,992 10,347
Supplemental disclosures of non-cash flow information      
Expenses related to offerings not yet paid [3] 76
Repayment of long-term loan by issuance of units and pre-funded units [1] 3,000
At-the-market offering expenses not yet paid [3] 25
Classification of other current assets to property and equipment, net 98 236
Classification of inventory to other current assets 164
Classification of inventory to property and equipment 50 174
Cashless exercise of pre-funded warrants 72
Initial recognition of operating lease right-of-use assets 2,099
Initial recognition of operating lease liabilities (2,249)
Supplemental disclosures of cash flow information:      
Cash and cash equivalents 20,350 16,253 9,546
Restricted cash included in other long term assets 704 739 801
Total Cash, cash equivalents, and restricted cash 21,054 16,992 10,347
Supplemental disclosures of cash flow information:      
Cash paid for income taxes 13 21 25
Cash paid for interest $ 862 $ 1,499 $ 1,501
[1] See note 6.
[2] See note 10.
[3] See note 8b.