EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| EMPLOYEE BENEFITS. | |||
| Requisite service period of employees to be eligible to participate in the 401(k) plan | 3 months | ||
| Total expense for contributions made to 401(k) plan | $ 613 | $ 44 | $ 35 |