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Geographic Information (Tables) | 9 Months Ended
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Sep. 30, 2021
Segments Geographical Areas [Abstract] |
Gross Billings Percentage, Based on Billing Address of Clients or Client Affiliates | Gross Billings, set forth as a percentage, based on the billing address of the clients or client affiliates, were as follows:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
U.S. |  |  | 87 | % |  |  | 86 | % |  |  | 86 | % |  |  | 86 | %
International |  |  | 13 | % |  |  | 14 | % |  |  | 14 | % |  |  | 14 | %
Total |  |  | 100 | % |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 + Details
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