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Percentage of Revenue by Geographic Area (Detail) - Geographic Concentration Risk - Total Revenue | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Concentration Risk [Line Items] |  |
Revenues, percentage by country | 100.00% | 100.00%
United States |  |
Concentration Risk [Line Items] |  |
Revenues, percentage by country | 38.00% | 30.00%
Sweden |  |
Concentration Risk [Line Items] |  |
Revenues, percentage by country | 27.00% | 24.00%
Ireland |  |
Concentration Risk [Line Items] |  |
Revenues, percentage by country | 10.00% | 4.00%
United Kingdom |  |
Concentration Risk [Line Items] |  |
Revenues, percentage by country | 5.00% | 13.00%
Other |  |
Concentration Risk [Line Items] |  |
Revenues, percentage by country | 20.00% | 29.00%

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