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Inventories, Net and Significant Supplier - Related Party Supplier (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Executive Vice President
Related Party Transaction
Ownership percentage in third party by executive			40.00%
Affiliated Entity | Related party supplier | Cost of goods
Related Party Transaction
Purchases from related party	$ 1,378	$ 1,382	$ 3,962	$ 4,971
Concentration risk percentage	1.30%	1.50%	1.30%	1.80%
Affiliated Entity | Related party supplier | Accounts payable
Related Party Transaction
Concentration risk percentage			1.60%		1.70%
Accounts payable	$ 1,763		$ 1,763		$ 1,690

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