PREPAID EXPENSE AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Prepaid Expense and Other Current Assets | ||
| Other receivables | $ 3,712 | $ 4,607 |
| Prepaid expense | 633 | 1,076 |
| Deposits | 7 | 1,395 |
| Inventory, net | 0 | 587 |
| Other current assets | 271 | 242 |
| Total | 4,623 | $ 7,907 |
| Impairment on security deposit | $ 1,300 |