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STOCK-BASED COMPENSATION PLANS - Summary of stock-based compensation expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Total stock based compensation expense | $ 535 | $ 401 | $ 1,124 | $ 509
Cost of sales |  |  |  |
Total stock based compensation expense | 12 | 15 | 27 | 30
Sales and marketing expense. |  |  |  |
Total stock based compensation expense | 55 | 15 | 114 | 30
General and administrative |  |  |  |
Total stock based compensation expense | $ 468 | $ 371 | $ 983 | $ 449

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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