Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Summary of Significant Accounting Policies - Summary of Customers Whose Revenue and Accounts Receivable Balances (Parenthetical) (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
Concentration Risk [Line Items]        
Concentration risk percentage 100.00% 100.00% 100.00% 100.00%
Maximum [Member]        
Concentration Risk [Line Items]        
Concentration risk percentage 10.00%