Segment Information - Customers Accounted for 10% or More of Revenue (Detail) |
12 Months Ended | |
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Dec. 31, 2018 |
Dec. 31, 2017 |
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Customer Concentration Risk [Member] | Sales [Member] | Central Banks [Member] | ||
Revenue, Major Customer [Line Items] | ||
Entity wide revenue major customers percentage | 65.00% | 55.00% |
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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