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Percentage of Revenue by Geographic Area (Detail) - Geographic Concentration Risk - Total Revenue | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 100.00% | 100.00% | 100.00% | 100.00%
North America |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 47.00% | 38.00% | 46.00% | 38.00%
Europe |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 41.00% | 50.00% | 42.00% | 52.00%
Asia and Australia |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 12.00% | 11.00% | 12.00% | 9.00%
Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country |  | 1.00% |  | 1.00%

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