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Segment information - Schedule of Revenue by Geography Based on Customer Location (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue:        
Revenue $ 53,024 $ 41,043 $ 103,790 $ 80,467
United States [Member]        
Revenue:        
Revenue 51,152 36,608 97,846 72,013
Outside of the United States [Member]        
Revenue:        
Revenue [1] $ 1,872 $ 4,435 $ 5,944 $ 8,454
[1] No individual country, other than disclosed above, exceeded 10% of total consolidated revenue for any period presented.