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Concentration of Credit Risk - Additional Information (Details) - Vendor	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
China
Concentration Risk [Line Items]
Number of vendors	2	2	2	2
Customer Concentration Risk | Net Revenue
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
Customer Concentration Risk | Net Revenue | China
Concentration Risk [Line Items]
Concentration risk percentage	79.00%	71.00%	73.00%	68.00%
Customer Concentration Risk | Trade Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%

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Number of vendors.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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