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Commitments and Contingencies - Concentration of Credit Risk (Details) - customer | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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) | 62.00% | 67.00% |
Accounts Receivable | Credit Concentration Risk | Customer A |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk (as a percent) |  | 16.00% |
Accounts Receivable | Credit Concentration Risk | Customer B |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk (as a percent) |  | 21.00% |
Net Sales | Customer Concentration Risk | Customer A |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk (as a percent) | 13.00% | 11.00% |
Net Sales | Customer Concentration Risk | Customer C |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk (as a percent) |  |  | 12.00%

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: 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 3: 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=121572278&loc=d3e13531-108611 Reference 4: 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=121572278&loc=d3e13537-108611 Reference 5: 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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