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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	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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- Definition

Defined Contribution Plan Employee Eligibility Age

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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