SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Accounting Policies [Abstract] | |||
| Other than temporary impairment of marketable securities | $ 0 | $ 0 | $ 0 |
| Gain on sale of marketable securities previously impaired | 13 | 11 | 0 |
| Reimbursement revenue | 256 | 362 | 452 |
| Advertising expense | 450 | 301 | 220 |
| Severance expense | $ 426 | $ 159 | $ 221 |
| Weighted average number of anti-dilutive shares excluded from the calculation of diluted net earnings | 471,962 | 778,545 | 595,439 |
| Provision for doubtful accounts | $ 24 | $ 20 | |
| Bad debt expense | 4 | $ 20 | $ 0 |
| Cumulative-effect adjustment in accumulated deficit for forfeiture fair value amount | $ 103 | ||