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Segment and Geographic Information - Additional Information (Detail) - Segment
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Concentration Risk [Line Items]      
Number of reportable segments 1 1  
Total Revenue | Revenue from a single customer, percentage      
Concentration Risk [Line Items]      
Maximum percentage of revenue accountability   15.00% 20.00%
Accounts Receivable [Member] | Revenue from a single customer, percentage      
Concentration Risk [Line Items]      
Maximum percentage of revenue accountability 24.00% 30.00% 40.00%