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Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Accounting Policies (Textual) |  |  |
Net of allowances for doubtful accounts | $ 9 | $ 9 |
Total inventory write-offs during period | 369 | 498 | $ 346
Impairment losses |  |  |
Percentage of marketing expenses | 50.00% |  |
Reduction of marketing expenses for government grants | $ 6 | 75 | $ 215
Warrants excluded from calculation of diluted net income (loss) per share | 70,801 |  | 1,349,414
Unrecognized tax benefits |  |  |
Cumulative adjustment will increase in accumulated deficit | $ 337 |  |
Severance expenses | 1,007 | $ 905 | $ 485
Decreasing the Company's deferred revenues | $ 80 |  |
Recognized income tax positions, description | Measured at the largest amount that is greater than 50% of the amount likely to be realized. |  |
Increasing Company's trade receivables | $ 233 |  |
Increasing Company's other accounts receivable and prepaid expenses | $ 24 |  |

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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