Accounts Receivable, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accounts Receivable [Abstract]
Accounts receivable-net	$ 30,705	$ 29,530
Write-offs of accounts receivable	300	400
Provision for doubtful accounts	401	772
Government Segment [Member]
Accounts Receivable [Abstract]
Accounts receivable-net	5,180	8,134
Government Segment [Member] | Billed [Member]
Accounts Receivable [Abstract]
Accounts receivable-net	6,779	9,400
Government Segment [Member] | Advance Billings [Member]
Accounts Receivable [Abstract]
Accounts receivable-net	(1,599)	(1,266)
Restaurant and Retail [Member]
Accounts Receivable [Abstract]
Accounts receivable-net	25,525	21,396
Allowances for doubtful accounts	$ 900	$ 900