Segment Information - Revenue by Major Customer (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Customer A [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	21.80%	49.60%	31.90%	46.20%
Customer B [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	25.90%	13.40%	20.30%	13.80%
Customer C [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	13.70%		10.90%
Accounts Receivable [Member] | Customer A [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage			18.80%		10.40%
Accounts Receivable [Member] | Customer B [Domain]
Revenue, Major Customer [Line Items]
Entity-Wide Revenue, Major Customer, Percentage			17.40%		15.40%