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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Plans, Defined Benefit | Sweden |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution plan, company contribution | $ 0.6 | $ 0.5 | $ 0.5
Minimum |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution plan, eligible age of employees | 21 years |  |
Defined Contribution 401 K Plan |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution plan, company contribution | $ 0.7 | $ 0.5 | $ 0.2

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