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Other Revenue and Cost of Revenue - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation Of Revenue [Line Items]        
Product revenues $ 173,825 $ 130,279 $ 485,000 $ 362,432
Product cost of revenues 39,274 30,784 113,014 87,651
Product        
Disaggregation Of Revenue [Line Items]        
Product revenues 9,000 6,900 25,800 19,100
Product cost of revenues $ 7,100 $ 6,200 $ 22,500 $ 18,200