Major Customers and Accounts Receivable (Details) - Customer concentration risk - Customer		3 Months Ended		9 Months Ended
	Dec. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue
Concentration Risk [Line Items]
Concentration risk, number of customer		2	1	1
Concentration risk, percentage		26.50%	17.60%	20.90%	18.60%
Accounts receivable
Concentration Risk [Line Items]
Concentration risk, number of customer	1			1
Concentration risk, percentage	19.90%			13.80%