Accounts Receivable, Net - Schedule of Accounts Receivable (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Contract billings	$ 3,751,000	$ 2,330,000
Retainage	274,000	370,000
Subtotal	4,025,000	2,700,000
Less - allowance for doubtful accounts	(185,000)	(96,000)
Accounts receivable, net	$ 3,840,000	$ 2,604,000