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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     $ 37,970    
Additions     75    
Disposals     (14)    
Net foreign currency translation     (89)    
Amortization expense $ (2,196) $ (1,091) (6,623) $ (3,348)  
Ending Balance 31,319   31,319    
September 30, 2016 balance at cost         $ 61,822
Accumulated amortization         (30,503)
Ending Balance 31,319   31,319   31,319
Capitalized Technology [Member]          
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     34,632    
Additions     0    
Disposals     0    
Net foreign currency translation     (44)    
Amortization expense     (6,233)    
Ending Balance 28,355   28,355    
September 30, 2016 balance at cost         57,249
Accumulated amortization         (28,894)
Ending Balance 28,355   28,355   28,355
Patents and Trademarks [Member]          
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     2,214    
Additions     75    
Disposals     (14)    
Net foreign currency translation     0    
Amortization expense     (158)    
Ending Balance 2,117   2,117    
September 30, 2016 balance at cost         2,918
Accumulated amortization         (801)
Ending Balance 2,117   2,117   2,117
Other [Member]          
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     1,124    
Additions     0    
Disposals     0    
Net foreign currency translation     (45)    
Amortization expense     (232)    
Ending Balance 847   847    
September 30, 2016 balance at cost         1,655
Accumulated amortization         (808)
Ending Balance $ 847   $ 847   $ 847