Quarterly report pursuant to Section 13 or 15(d)

Entity Level Information - Percentage of Total Revenues (Details)

v3.19.3
Entity Level Information - Percentage of Total Revenues (Details) - Revenues - Customer Concentration
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Customer A        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage 25.00% 16.00% 31.00% 15.00%
Customer B        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage   19.00%   18.00%
Customer C        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage 19.00%   20.00%  
Customer D        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage 19.00% 13.00% 12.00% 12.00%
Customer E        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage   33.00%   31.00%