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Percentage of Revenue by Geographic Area (Detail) - Geographic Concentration Risk - Total Revenue | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 100.00% | 100.00% | 100.00% | 100.00%
Sweden |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 51.00% | 48.00% | 44.00% | 44.00%
United States |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 21.00% | 23.00% | 25.00% | 32.00%
United Kingdom |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 17.00% | 25.00% | 18.00% | 21.00%
Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenues, percentage by country | 11.00% | 4.00% | 13.00% | 3.00%

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