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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



-Section 50



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-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



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-Publisher FASB



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