Segment Information - Revenue by Major Customer (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Customer A [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage		33.70%	25.50%	42.10%
Customer B [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	30.30%	15.50%	23.10%	14.40%
Customer C [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	17.70%		12.80%
Accounts Receivable [Member] | Customer A [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage					10.40%
Accounts Receivable [Member] | Customer B [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage			22.40%		15.40%
Accounts Receivable [Member] | Customer C [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage			10.20%