STOCK CAPITAL - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Total stock-based compensation expense | $ 390 | $ 363 |
| Research and development [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Total stock-based compensation expense | 60 | 48 |
| General and administrative [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Total stock-based compensation expense | $ 330 | $ 315 |