Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows used in operating activities:
Net loss		$ (15,551)	$ (21,675)	$ (24,717)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation		321	463	642
Share-based compensation to employees and non-employees		1,108	2,766	3,654
Deferred taxes		(57)	(107)	73
Loss on extinguishment of debt				313
Loss on inducement of debt	[1]		600
Financial expenses related to long term loan			224	128
Changes in assets and liabilities:
Trade receivables, net		(36)	322	151
Prepaid expenses, operating lease right-of-use assets and other assets		64	734	(438)
Inventories		(1,221)	1,403	(582)
Trade payables		370	492	(1,613)
Employees and payroll accruals		20	(222)	(147)
Deferred revenues		176	283	47
Other current and long term liabilities		(9)	(57)	27
Net cash used in operating activities		(14,815)	(14,774)	(22,462)
Cash flows used in investing activities:
Purchase of property and equipment		(22)	(13)	(21)
Net cash used in investing activities		(22)	(13)	(21)
Cash flows from financing activities:
Issuance of ordinary shares upon exercise of options to purchase ordinary shares by employees and non-employees				38
Repayment of long term loan		(1,722)	(3,866)	(3,102)
Issuance of ordinary shares in investment agreement, net of issuance expenses in an amount of $830	[2]		4,295
Issuance of ordinary shares in at-the-market offering, net of issuance expenses paid in the amount of $211	[2]		1,142	9,309
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],[2]		8,140	7,163
Issuance of ordinary shares in a "best efforts" offering, net of issuance expenses in the amount of $ 686	[2]	3,684
Issuance of ordinary shares in a "registered direct" offerings, net of issuance expenses in the amount of $1,035	[2]	8,125
Issuance of ordinary shares in a "warrant exercise" agreement, net of issuance expenses in the amount of $ 1,019	[2]	9,966
Exercise of pre-funded warrants and warrants	[2]	1,429
Net cash provided by financing activities		21,482	9,711	13,408
Increase (decrease) in cash, cash equivalents, and restricted cash		6,645	(5,076)	(9,075)
Cash, cash equivalents, and restricted cash at beginning of period		10,347	15,423	24,498
Cash, cash equivalents, and restricted cash at end of period		16,992	10,347	15,423
Supplemental disclosures of non-cash flow information
Repayment of long term loan by issuance of units and pre-funded units	[1]		3,000
At-the-market offering expenses not yet paid	[2]		25
Classification of other current assets to property and equipment, net			236
Classification of inventory to other current assets		164
Classification of inventory to property and equipment		174		203
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		16,253	9,546	14,567
Restricted cash included in other long term assets		739	801	856
Total Cash, cash equivalents, and restricted cash		16,992	10,347	15,423
Supplemental disclosures of cash flow information:
Cash paid for income taxes		21	25	21
Cash paid for interest		$ 1,499	$ 1,501	$ 2,300

[1] See note 6.

[2] See note 8b.