Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Changes in Allowance for Doubtful Accounts

For the years ended December 31, 2019, 2018 and 2017, changes in the allowance for doubtful accounts were as follows (in thousands):

	2019			2018			2017
Balance at beginning of year	$	321		$	554		$	565
Provision charged to selling, general and administrative expenses		33			66			283
Allowance resulting from acquisitions		120			—			52
Write-offs, net of recoveries of amounts previously reserved		(179	)		(295	)		(358	)
Exchange rate changes		2			(4	)		12
Balance at end of year	$	297		$	321		$	554