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Revenue Recognition - Summary of Revenues Disaggregated by Geography (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]        
Total revenue $ 46,224 $ 53,165 $ 144,984 $ 173,535
UNITED STATES        
Disaggregation Of Revenue [Line Items]        
Total revenue 29,430 39,792 96,532 129,737
Other        
Disaggregation Of Revenue [Line Items]        
Total revenue [1] $ 16,794 $ 13,373 $ 48,452 $ 43,798
[1] No single country represented 10% of the Company’s revenues in the periods presented.