Revenue (Major Customers) (Details) - customer |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
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| Major Customers | ||
| Revenue as a percentage of the company's total | 20.00% | 19.00% |
| Revenues | Customer concentration risk | Fidelity | ||
| Major Customers | ||
| Number of customers accounted for as major customer | 1 | 1 |
| Revenue as a percentage of the company's total | 16.00% | 16.00% |
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- Definition Represents the number of customers of the entity. No definition available.
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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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- 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://www.xbrl.org/2003/role/presentationRef
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