Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts Receivable [Abstract]
Accounts receivable – net	$ 38,706	$ 42,980
Allowance for doubtful accounts	1,300	1,400
Government Segment
Accounts Receivable [Abstract]
Accounts receivable – net	10,541	10,277
Restaurant and Retail
Accounts Receivable [Abstract]
Accounts receivable – net	28,165	32,703
Allowance for doubtful accounts	1,254	1,416	$ 2,073	$ 1,849
Billed | Government Segment
Accounts Receivable [Abstract]
Accounts receivable – net	10,700	11,225
Advanced billings | Government Segment
Accounts Receivable [Abstract]
Accounts receivable – net	$ 159	$ 948