Annual report pursuant to Section 13 and 15(d)

Entity Level Information - Percentage of Total Revenues (Details)

v3.20.4
Entity Level Information - Percentage of Total Revenues (Details) - Revenues - Customer Concentration
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage 76.00% 70.00%
Customer A    
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage 15.00% 37.00%
Customer B    
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage 10.00% 18.00%
Customer C    
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage 40.00% 15.00%
Customer D    
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage 11.00%