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Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 25, 2017 | Oct. 20, 2017 | May 31, 2016 | May 25, 2016 | May 19, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 31, 2017 | Oct. 30, 2016
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Ordinary shares held by the company |  |  |  |  |  | 30,843 |  |  |  |
Ordinary shares issued |  |  | 2,090,909 |  |  |  |  |  |  |
Offering price per share |  |  | $ 11.00 |  |  |  |  |  | $ 19.50 |
Net of issuance costs |  |  | $ 21,279 |  |  | $ 30,206 | $ 21,279 |  |  |
Ordinary shares issued, does not include |  |  |  |  | 1,818,182 | 5,189 | 5,189 |  |  |
Board [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Shares available for future grants |  |  |  |  |  | 179,002 |  |  |  |
Follow-on public offering [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Ordinary shares issued |  | 1,444,814 |  |  | 1,818,182 |  |  |  |  |
Offering price per share |  | $ 19.50 |  |  | $ 11.00 |  |  |  |  |
Gross proceeds |  | $ 28,174 |  |  | $ 20,000 |  |  |  |  |
Other offering expenses |  | $ 1,940 |  |  | $ 1,455 |  |  |  |  |
Ordinary shares |  |  |  |  | 272,727 |  |  |  |  |
2017 Public Offering [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Ordinary shares issued | 1,661,536 |  |  |  |  |  |  |  |  |
Purchase additional shares, for total consideration | $ 30,206 |  |  |  |  |  |  |  |  |
Net of issuance costs | $ 2,194 |  |  |  |  |  |  |  |  |
Stock options [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value |  |  |  |  |  | 679,552 |  |  |  |
Options outstanding and exercisable |  |  |  |  |  | 679,552 | 624,437 |  |  |
Weighted average fair values of options granted |  |  |  |  |  | $ 8.08 | $ 6.68 | $ 4.90 |  |
Outstanding options |  |  |  |  |  | 254,850 | 330,337 |  |  |
Underwriters' Option [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Ordinary shares issued |  |  |  | 272,727 |  |  |  |  |  |
Purchase additional shares, for total consideration |  |  |  | $ 21,279 |  |  |  |  |  |
Net of issuance costs |  |  |  | $ 1,721 |  |  |  |  |  |
Ordinary shares |  |  |  | 2,090,909 |  |  |  |  |  |
Underwriters' Option [Member] | 2017 Public Offering [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Ordinary shares issued | 216,722 |  |  |  |  |  |  |  |  |
RSUs [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Shares available for future grants |  |  |  |  |  | 105,428 |  |  |  |
Weighted average fair values of options granted |  |  |  |  |  | $ 19.52 | $ 14.69 | $ 10.60 |  |
Compensation cost |  |  |  |  |  | $ 1,335 | $ 1,331 | $ 342 |  |
Unrecognized costs related to non-vested share-based compensation |  |  |  |  |  | $ 4,266 |  |  |  |
Recognized over a weighted average period |  |  |  |  |  | 1 year 2 months 12 days |  |  |  |
RSUs [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Weighted average fair values of options granted |  |  |  |  |  | $ 19.85 |  |  |  |
RSUs [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Weighted average fair values of options granted |  |  |  |  |  | $ 18.90 |  |  |  |
Exercisable for 30 days [Member] | Follow-on public offering [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Ordinary shares issued |  | 216,722 |  |  |  |  |  |  |  |
Offering price per share |  | $ 19.50 |  |  |  |  |  |  |  |
2013 Share Option Plan [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Shares available for future grants |  |  |  |  |  | 901,770 |  |  |  |
2013 Share Option Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Increase number of shares reserved under share option plan |  |  |  |  |  |  |  |  |  | 2,450,000
2013 Share Option Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Shareholder's Equity (Textual) |  |  |  |  |  |  |  |  |  |
Increase number of shares reserved under share option plan |  |  |  |  |  |  |  |  |  | 1,250,000

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