Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounts Receivable [Abstract]
Accounts receivable - net	$ 38,236	$ 41,774
Government
Accounts Receivable [Abstract]
Accounts receivable - net	8,600	11,000
Restaurant/Retail
Accounts Receivable [Abstract]
Accounts receivable - net	29,636	30,774
Allowance for doubtful accounts	2,048	1,849	$ 1,708	$ 1,351
Billed | Government
Accounts Receivable [Abstract]
Accounts receivable - net	9,091	11,608
Advanced billings | Government
Accounts Receivable [Abstract]
Accounts receivable - net	$ (491)	$ (608)