SIGNIFICANT ACCOUNTING POLICIES (Weighted Average Assumptions) (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Accounting Policies [Abstract] | |||
| Dividend yield | 0.00% | 0.00% | 0.00% |
| Expected volatility | 74.00% | 65.00% | 65.00% |
| Risk-free interest | 2.23% | 1.37% | 1.75% |
| Expected term (years) | 5 years 6 months | 5 years 7 months 6 days | 5 years 6 months |