Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts Receivable [Abstract]
Accounts receivable - net	$ 42,819	$ 41,774
Government
Accounts Receivable [Abstract]
Accounts receivable - net	9,141	11,000
Restaurant/Retail
Accounts Receivable [Abstract]
Accounts receivable - net	33,678	30,774
Allowance for doubtful accounts	2,073	1,849
Billed | Government
Accounts Receivable [Abstract]
Accounts receivable - net	9,895	11,608
Advanced billings | Government
Accounts Receivable [Abstract]
Accounts receivable - net	$ (754)	$ (608)