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Shareholders' Equity (Details) - Common Stock [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of options, outstanding at beginning of year |  | 875,500 | 710,300 | 851,600
Number of options, granted | [1] | 90,000 | 344,000 | 116,800
Number of options, exercised |  | (46,000) | (59,000) | (92,000)
Number of options, forfeited |  | (78,400) | (117,800) | (166,000)
Number of options, expired |  | (28,000) | (2,000) |
Number of options, outstanding at end of year |  | 813,100 | 875,500 | 710,300
Number of options, exercisable at end of year |  | 303,000 | 246,500 | 51,000
Vested and expected to vest at end of year, Number |  | 731,517 |  |
Weighted average exercise price, options outstanding at beginning of year |  | $ 1.60 | $ 2.51 | $ 2.63
Weighted average exercise price, options granted | [1] | 0.65 | 0.003 | 1.66
Weighted average exercise price, options exercised |  | 1.15 | 1.45 | 1.85
Weighted average exercise price, options forfeited |  | 1.41 | 2.49 | 2.88
Weighted average exercise price, options expired |  | 2.95 | 2.16 |
Weighted average exercise price, options outstanding at end of year |  | 1.49 | 1.60 | 2.51
Weighted average exercise price, options exercisable at end of year |  | 2.90 | 2.87 | 1.98
Vested and expected to vest at end of year, Weighted average exercise price |  | 1.72 |  |
Weighted average grant date fair value of options granted during the year | [2] | $ 1.30 | $ 1.46 | $ 0.94
[1] | In the year ended December 31, 2017 the options were granted with an exercise price equal to the average closing price per share of the Company's ordinary shares on the stock market during the 30 trading day period immediately preceding the date of grant of such option or with an exercise price equal to par value of NIS 0.01. In the year ended December 31, 2016 the options were granted with an exercise price equal to par value of NIS 0.01. In the year ended December 31, 2015 the options were granted with an exercise price equal to the average closing price per share of the Company's ordinary shares on the stock market during the 30 trading day period immediately preceding the date of grant of such option or with an exercise price equal to par value of NIS 0.01.
[2] | The fair value of each stock option granted is computed on the date of grant according to the Black-Scholes option-pricing model with the following assumptions:

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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