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Employee Benefit Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2015 USD ($) Age | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Pension Plans, Defined Benefit | Sweden |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution plan, company contribution | $ 485,000 | $ 493,000 | $ 437,000
Minimum |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution plan, eligible age of employees | Age | 21 |  |
Defined Contribution 401 K Plan |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution plan, company contribution | $ 141,000 | $ 107,000 | $ 92,000

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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