STOCK-BASED COMPENSATION - Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| General and Administrative Expense [Member] | ||||
| STOCK-BASED COMPENSATION | ||||
| Stock compensation expense | $ 10 | $ 10 | $ 40 | $ 40 |