SHAREHOLDERS' DEFICIT - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Equity [Abstract] | ||||
| Stock-based compensation expense | $ 174 | $ (300) | $ 1,000 | |
| Stock-based compensation benefit | $ (10) | |||
| Unrecognized compensation cost | $ 254 | $ 440 | ||
| Unvested stock options (in shares) | 790 | 9,453 | ||
| Weighted-average remaining vesting period | 2 years 6 months | 2 years 8 months 12 days | ||
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of cost to be recognized for option under share-based payment arrangement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Number of non-vested options outstanding. No definition available.
|