Significant Customers (Details) - Customer / Number	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue [Member]
Significant Customers (Textual)
Number of customers	4	4	4	4
Concentration risk, description			No other customer accounted for 10% or more of the Company’s revenues.	No other customer accounted for 10% or more of the Company’s revenues.
Revenue [Member] | Customer One [Member]
Significant Customers (Textual)
Concentration risk, percentage	32.00%	17.00%	21.00%	17.00%
Revenue [Member] | Customer Two [Member]
Significant Customers (Textual)
Concentration risk, percentage	12.00%	12.00%	11.00%	13.00%
Revenue [Member] | Customer Three [Member]
Significant Customers (Textual)
Concentration risk, percentage	12.00%	11.00%	11.00%	11.00%
Revenue [Member] | Customer Four [Member]
Significant Customers (Textual)
Concentration risk, percentage	10.00%	11.00%	10.00%	10.00%
Accounts receivable [Member]
Significant Customers (Textual)
Concentration risk, description			Customers individually representing more than 10% of trade receivables.		Customers individually representing more than 10% of trade receivables.
Accounts receivable [Member] | Customer [Member]
Significant Customers (Textual)
Concentration risk, percentage			77.00%		69.00%