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Percentage of Revenue by Geographic Area (Detail) - Geographic Concentration Risk - Total Revenue	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Revenues, percentage by country	100.00%	100.00%	100.00%
United States
Concentration Risk [Line Items]
Revenues, percentage by country	43.00%	39.00%	28.00%
Sweden
Concentration Risk [Line Items]
Revenues, percentage by country	20.00%	29.00%	37.00%
United Kingdom
Concentration Risk [Line Items]
Revenues, percentage by country	4.00%	7.00%	17.00%
Other
Concentration Risk [Line Items]
Revenues, percentage by country	33.00%	25.00%	18.00%

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- Definition

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
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-Topic 825
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