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STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
STOCK-BASED COMPENSATION |  |  |  |
Stock based compensation expense | $ 367 | $ 420 | $ 767 | $ 825
Remaining unrecognized compensation expense related to nonvested awards | 1,700 |  | $ 1,700 |
Weighted-average remaining requisite service period |  |  | 9 months 18 days |
Cost of sales |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Stock based compensation expense | 5 | 5 | $ 9 | 9
Selling, general and administrative |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Stock based compensation expense | 298 | 339 | 628 | 659
Research and development |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Stock based compensation expense | $ 64 | $ 76 | $ 130 | $ 157

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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