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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts Receivable, after Allowance for Credit Loss [Abstract] |  |  |
Accounts receivable | $ 4,950 | $ 5,080 |
Reserves | (257) | (176) |
Accounts receivable, net | 4,693 | 4,904 |
Accounts receivable | $ 211 | $ (2,698) | $ (171)

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