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Summary of Significant Accounting Policies - Schedule of Number of Customers that Accounted for More than Ten Percentage of Annual Sales and Receivable Balances (Detail) - Customer
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Concentration Risk [Line Items]    
Number of Customers 3 3
Revenue Combined Percent 53.00% 51.00%
Revenue [Member]    
Concentration Risk [Line Items]    
Number of Customers 3 3
Customer Accounted [Member] | Revenue [Member]    
Concentration Risk [Line Items]    
Revenue Combined Percent 53.00% 51.00%
Customer Accounted [Member] | Accounts Receivable    
Concentration Risk [Line Items]    
Revenue Combined Percent 36.00% 33.00%