INVENTORY - Summary of inventory (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Raw materials | $ 2,953 | $ 1,903 |
| Finished goods | 8,504 | 8,420 |
| Inventory reserves | (2,446) | (2,706) |
| Inventory, net | $ 9,011 | $ 7,617 |