Major Customers (Details) - Customer Concentration Risk - customer	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Concentration Risk [Line Items]
Number of customers	2	3		2
Revenues | Customer No. 1
Concentration Risk [Line Items]
Concentration risk percentage	17.00%		16.00%
Revenues | Customer No. 2
Concentration Risk [Line Items]
Concentration risk percentage	13.00%		12.00%
Revenues | Customer No. 3
Concentration Risk [Line Items]
Concentration risk percentage		10.00%
Revenues | Customer No. 4
Concentration Risk [Line Items]
Concentration risk percentage		13.00%		12.00%
Revenues | Customer No. 5
Concentration Risk [Line Items]
Concentration risk percentage		10.00%		10.00%
Accounts Receivable | Customer No. 1
Concentration Risk [Line Items]
Concentration risk percentage				41.00%
Accounts Receivable | Customer No. 2
Concentration Risk [Line Items]
Concentration risk percentage			10.00%