Accounts Receivable, net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Government segment:
Write-offs of accounts receivable	$ 300	$ 400
Increase in bad debt expense	830	805
Restaurant/Retail
Government segment:
Allowances for doubtful accounts	$ 1,800	$ 1,300