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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Shares issuance expense and underwriters discounts |  | $ 579,000
Shares withheld to pay option price | 68,416 |
IPO |  |
Shares issuance expense and underwriters discounts | $ 6,105,000 |
Ordinary Shares |  |
Shares withheld to pay option price | 68,416 |
Maximum |  |
Exercise of options into ordinary shares |  | 1,000
Maximum | Ordinary Shares |  |
Exercise of options into ordinary shares |  | 1,000
Maximum | Additional Paid-In Capital |  |
Exercise of options into ordinary shares |  | $ 1,000

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