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Accounts Receivable | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable Accounts receivable, net, are comprised of the following amounts:
|  | As of December 31,
|  | 2020 |  | 2019
Trade |  | $ | 86,659 |  |  | $ | 85,284 |
Less—allowance for credit losses |  | 2,044 |  |  | 2,044 |
Accounts receivable, net |  | $ | 84,615 |  |  | $ | 83,240 |
The following table presents changes in allowance for credit losses.
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Balance at beginning of year |  | $ | 2,044 |  |  | $ | 2,517 |  |  | $ | 2,339 |
Additions |  | 505 |  |  | 231 |  |  | 628 |
Write-offs |  | (562) |  |  | (692) |  |  | (400) |
Currency impact |  | 57 |  |  | (12) |  |  | (50) |
Balance at end of year |  | $ | 2,044 |  |  | $ | 2,044 |  |  | $ | 2,517 |
As of December 31, 2020, one customer represented 11% of consolidated accounts receivable from continuing operations. As of December 31, 2019, another customer represented 10% of consolidated accounts receivable from continuing operations. Amounts due from these customers are primarily related to Mobile Solutions.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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