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Percentage of Revenue by Geographic Area (Detail) - Geographic Concentration Risk - Total Revenue | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 100.00% | 100.00% | 100.00% | 100.00%
United States |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 38.00% | 45.00% | 38.00% | 37.00%
Sweden |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 29.00% | 29.00% | 28.00% | 31.00%
United Kingdom |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 14.00% | 13.00% | 14.00% | 16.00%
Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 19.00% | 13.00% | 20.00% | 16.00%

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