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Accounts Receivable and Sales Concentrations | 12 Months Ended
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Dec. 31, 2019
Receivables [Abstract] |
Accounts Receivable and Sales Concentrations | Accounts receivable, net are comprised of the following amounts:
|  | As of December 31,
|  | 2019 |  | 2018
Trade |  | $ | 132,910 |  |  | $ | 135,260 |
Less—allowance for doubtful accounts |  | 1,352 |  |  | 1,839 |
Accounts receivable, net |  | $ | 131,558 |  |  | $ | 133,421 |
The following table presents changes in allowance for doubtful accounts.
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Balance at beginning of year |  | $ | 1,839 |  |  | $ | 1,719 |  |  | $ | 1,069 |
Additions |  | 449 |  |  | 754 |  |  | 648 |
Write-offs |  | (924 | ) |  | (584 | ) |  | (101 | )
Currency impact |  | (12 | ) |  | (50 | ) |  | 103 |
Balance at end of year |  | $ | 1,352 |  |  | $ | 1,839 |  |  | $ | 1,719 |

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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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- References No definition available. + Details
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