Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Changes in Allowance for Doubtful Accounts

For the years ended December 31, 2020, 2019 and 2018, changes in the allowance for doubtful accounts were as follows (in thousands):

	2020			2019			2018
Balance at beginning of year	$	297		$	321		$	554
Addition to credit loss expense		158			33			66
Credit loss resulting from acquisitions		—			120			—
Write-offs, net of recoveries of amounts previously reserved		(207	)		(179	)		(295	)
Exchange rate changes		26			2			(4	)
Balance at end of year	$	274		$	297		$	321