Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable
Balance at beginning of year	$ 360	$ 387	$ 425
Provision and reserve adjustments	(132)		285
Write-offs less recoveries	(4)	(27)	(323)
Balance at end of year	$ 224	$ 360	$ 387