Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Customers Whose Revenue and Accounts Receivable Balances (Detail)

v3.21.2
Summary of Significant Accounting Policies - Summary of Customers Whose Revenue and Accounts Receivable Balances (Detail) - Customer Concentration Risk [Member] - Revenue [Member]
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Customer A        
Concentration Risk [Line Items]        
Concentration Customer Risk, Percentage 18.00% 24.00% 27.00% 35.00%
Customer B        
Concentration Risk [Line Items]        
Concentration Customer Risk, Percentage 17.00% 20.00% 19.00% 21.00%
Customer C        
Concentration Risk [Line Items]        
Concentration Customer Risk, Percentage   16.00% 11.00% 10.00%