Geographic, Customer and Supplier Information - Major Customers (Details) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member] - customer	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Major customers
Number of customers	10	10	10
Percentage of revenue contributed by customer	21.00%	29.00%	24.00%

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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