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ACCOUNTS RECEIVABLE, NET - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts receivable, net |  |  |
Accounts receivable, gross | $ 23,305 | $ 27,994 |
Less: Allowance for credit losses | (5,297) | (5,581) | $ (4,472)
Total | 18,008 | 22,413 |
Charged to Expenses | 1,354 | 2,229 |
Billed |  |  |
Accounts receivable, net |  |  |
Accounts receivable, gross | 17,907 | 19,703 |
Unbilled |  |  |
Accounts receivable, net |  |  |
Accounts receivable, gross | $ 5,398 | $ 8,291 |

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