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Segment and Geographic Information - Schedule of Revenue by Geographic Area (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Revenue recognized $ 212,958 $ 130,996 $ 183,189
Europe [Member]      
Segment Reporting Information [Line Items]      
Revenue recognized 112,916 110,861 151,736
Japan [Member] | Related Party [Member]      
Segment Reporting Information [Line Items]      
Revenue recognized 100,002 20,111 31,323
All other [Member]      
Segment Reporting Information [Line Items]      
Revenue recognized $ 40 $ 24 $ 130