Receivables (Tables)

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Summary of Changes in Allowance for Doubtful Accounts

Changes in the allowance for doubtful accounts consisted of the following (in thousands):

	Year Ended December 31,
	2019			2018			2017
Balance at beginning of year	$	607		$	277		$	487
Increase in allowance charged to expense		362			611			103
Accounts charged against the allowance, net of recoveries		(412	)		(281	)		(313	)
Balance at end of year	$	557		$	607		$	277