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Commitments and Contingencies - Concentration of Credit Risk (Details) - Credit Concentration Risk	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Receivable | Ten largest customers
Concentration of Credit Risk
Concentration Risk (as a percent)	67.00%	73.00%
Accounts Receivable | Customer A
Concentration of Credit Risk
Concentration Risk (as a percent)	24.00%	23.00%
Accounts Receivable | Customer B
Concentration of Credit Risk
Concentration Risk (as a percent)		17.00%
Net Sales | Customer A
Concentration of Credit Risk
Concentration Risk (as a percent)	21.00%	13.00%
Net Sales | Customer C
Concentration of Credit Risk
Concentration Risk (as a percent)			20.00%
Net Sales | Customer D
Concentration of Credit Risk
Concentration Risk (as a percent)			12.00%

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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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No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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