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ACCOUNTS RECEIVABLE, NET (Tables) | 12 Months Ended
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Dec. 31, 2021
Receivables [Abstract] |
Schedule of accounts receivable, net | Accounts receivable, net consists of the following as of December 31:
(in thousands) |  | 2021 |  | 2020
Billed |  | $ | 17,907 |  |  | $ | 19,703 |
Unbilled |  | 5,398 |  |  | 8,291 |
|  | 23,305 |  |  | 27,994 |
Less: Allowance for credit losses |  | (5,297) |  |  | (5,581) |
Total |  | $ | 18,008 |  |  | $ | 22,413 |
Changes in allowance for expected credit losses consist of the following:
|  |  |  | Additions |
(in thousands) |  | Balance at Beginning of Period |  | Charged to Expenses |  | Deductions Note (1) |  | Balance at End of Period
Allowance for expected credit losses: |  |  |  |  |  |  |  |
Year ended December 31, 2021 |  | $ | 5,581 |  |  | $ | 1,354 |  |  | $ | 1,638 |  |  | $ | 5,297 |
Year ended December 31, 2020 |  | 4,472 |  |  | 2,229 |  |  | 1,120 |  |  | 5,581 |
______________________________________ (1) Amounts written off as uncollectible or transferred to other accounts or utilized.

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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