Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Concentration Risk (Details)

v3.21.2
Summary of Significant Accounting Policies - Concentration Risk (Details) - Accounts Receivable - Customer Concentration Risk
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Customer A    
Concentration Risk [Line Items]    
Concentration risk, percentage 47.00% 0.00%
Customer B    
Concentration Risk [Line Items]    
Concentration risk, percentage 8.00% 16.00%
Customer C    
Concentration Risk [Line Items]    
Concentration risk, percentage 3.00% 55.00%
Customer D    
Concentration Risk [Line Items]    
Concentration risk, percentage 0.00% 13.00%