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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income (loss) $ 2,901 $ 1,915 $ (923)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:      
Depreciation 537 286 123
Share-based compensation and RSUs 2,216 2,471 1,409
Change in:      
Severance pay, net 42 4 73
Trade receivables, net (15,865) (329) 1,053
Other account receivables and prepaid expenses (524) 524 (1,266)
Inventories (560) 794 311
Trade payables (1,150) 1,273 (278)
Employees and payroll accruals 524 999 174
Other accounts payable and accrued expenses 1,385 266 531
Deferred revenue and advances from customers (109) 1,248 677
Net cash (used in) provided by operating activities (10,603) 9,451 1,884
Cash flows from investing activities:      
Investment in short-term bank deposits (40,000)
Purchase of property and equipment (790) (1,331) (97)
Net cash used in investing activities (40,790) (1,331) (97)
Cash flows from financing activities:      
Proceeds from issuance of Ordinary Shares, net of issuance costs upon follow-on public offering 30,206 21,279  
Exercise of warrants into Ordinary Shares 1,085 80
Exercise of options into Ordinary Shares 891 3,329 733
Net cash provided by financing activities 31,097 25,693 813
Foreign currency translation adjustments on cash and cash equivalents (15) 346 (721)
(Decrease) increase in cash and cash equivalents (20,311) 34,159 1,879
Cash and cash equivalents at beginning of year 42,886 8,727 6,848
Cash and cash equivalents at end of year 22,575 42,886 8,727
(a) Non-cash investing activities:      
Purchase of property and equipment 239 81 21
(b) Cash paid during the year for:      
Taxes on income $ 83 $ 24 $ 121