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INCOME TAXES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax |  |  |
Valuation allowance | $ 65,640,000 | $ 57,369,000 | $ 43,500,000
Capitalized research expenses | 5,800,000 | 19,900,000 |
Penalties or interest liabilities accrued | 0 | 0 | 0
Pretax income | 6,500,000 | 100,000 | (3,300,000)
Foreign subsidiaries' undistributed earnings |  | 13,600,000 |
Deferred tax liabilities for undistributed foreign earnings | 100,000 | 200,000 |
Tax benefit relating to the NOL carryback provisions CARES Act | 0 | 0 | $ 300,000
Research and development tax credits |  |  |
Income Tax |  |  |
Tax credit carryforwards | 500,000 |  |
Luminescent Systems Canada Inc. |  |  |
Income Tax |  |  |
Foreign subsidiaries' undistributed earnings | 1,900,000 | $ 3,400,000 |
Federal |  |  |
Income Tax |  |  |
Operating loss carryforwards | 1,900,000 |  |
Operating loss carryforwards, subject to expiration | 1,500,000 |  |
Operating loss carryforwards, not subject to expiration | 400,000 |  |
Foreign Tax Authority |  |  |
Income Tax |  |  |
Tax credit carryforwards | 200,000 |  |
State |  |  |
Income Tax |  |  |
Net operating loss carryforwards | 138,600,000 |  |
Tax credit carryforwards | $ 900,000 |  |

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