Accounts Receivable and Allowance for Doubtful Accounts (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Schedule of Allowance for Doubtful Accounts

Movements in the allowance for doubtful accounts are as follows (in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2018		2017			2018			2017
Beginning balance	$	329	$	107		$	363		$	66
Provision (recoveries)	268		50			237			91
Write-offs	—		(6		)	(3		)	(6		)
Ending balance	$	597	$	151		$	597		$	151