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v3.19.1

Segment Reporting and Geographic Information (Tables) | 3 Months Ended
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Mar. 31, 2019
Segment Reporting [Abstract] |
Revenues by Geographic Region | Revenues by geographic region are as follows (in percentages):
|  | Three months ended March 31, |
|  | 2018 |  |  | 2019 |
United States |  |  | 99 | % |  |  | 99 | %
Canada |  |  | 1 | % |  |  | 1 | %
Other countries |  | * |  |  | * |
|  |  | 100 | % |  |  | 100 | %
* | Less than 1% of revenue.

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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=115929826&loc=d3e9038-108599 + Details
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- References No definition available. + Details
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