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SIGNIFICANT ACCOUNTING POLICIES - Deferred Revenue, by Arrangement (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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SIGNIFICANT ACCOUNTING POLICIES |  |
Deferred revenue - current | $ 7,068 | $ 6,328
Deferred revenue - noncurrent | 5 | 83
Total deferred revenue | $ 7,073 | $ 6,411

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