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Commitments and Contingencies - Concentration of Credit Risk (Details) - customer | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Ten largest customers |  |  |
Concentration of Credit Risk |  |  |
Number of customers | 10 |  |
Accounts Receivable | Credit Concentration Risk | Ten largest customers |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk (as a percent) | 61.00% | 67.00% |
Accounts Receivable | Credit Concentration Risk | Customer A |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk (as a percent) |  | 24.00% |
Accounts Receivable | Credit Concentration Risk | Customer B |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk (as a percent) | 22.00% |  |
Net Sales | Credit Concentration Risk | Customer A |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk (as a percent) |  | 21.00% | 14.00%
Net Sales | Credit Concentration Risk | Customer C |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk (as a percent) | 12.00% |  |

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- Definition 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. + References No definition available. + Details
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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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