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Long Lived Assets by Geographic Area (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]    
Long Lived Assets $ 42,985 $ 47,348
United States    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long Lived Assets 36,350 38,695
Sweden    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long Lived Assets $ 6,635 $ 8,653