Accounts Receivable and Sales Concentrations (Tables)

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Summary of Accounts Receivables

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

Summary of Activity in the Allowance for Doubtful Accounts

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