Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Concentration of Credit Risk (Details)

v3.21.1
Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - Accounts Receivable
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Customer A    
Product Information [Line Items]    
Concentration risk (as a percent) 0.00% 15.00%
Customer B    
Product Information [Line Items]    
Concentration risk (as a percent) 55.00% 11.00%
Customer C    
Product Information [Line Items]    
Concentration risk (as a percent) 16.00% 2.00%
Customer D    
Product Information [Line Items]    
Concentration risk (as a percent) 13.00% 5.00%
Customer E    
Product Information [Line Items]    
Concentration risk (as a percent) 0.00% 10.00%
Customer F    
Product Information [Line Items]    
Concentration risk (as a percent) 5.00% 23.00%