OTHER LIABILITIES - Summary of other current liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Other Liabilities Disclosure [Abstract] | ||
| Payroll related | $ 1,545 | $ 898 |
| Accrued expenses | 1,664 | 1,966 |
| Other current liabilities, total | $ 3,209 | $ 2,864 |