Annual report pursuant to Section 13 and 15(d)

Entity Level Information - Percentage of Total Revenues (Details)

v3.20.1
Entity Level Information - Percentage of Total Revenues (Details) - Revenues - Customer Concentration
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage 60.00% 65.00%
Customer A    
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage   20.00%
Customer B    
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage 18.00%  
Customer C    
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage 15.00%  
Customer D    
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage   25.00%
Customer E    
Revenues From External Customers And Long Lived Assets [Line Items]    
Concentration risk percentage 27.00% 20.00%