Quarterly report pursuant to Section 13 or 15(d)

Entity Level Information - Percentage of Total Revenues (Details)

v3.19.2
Entity Level Information - Percentage of Total Revenues (Details) - Revenues - Customer Concentration
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Customer A        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage 32.00% 23.00% 34.00% 15.00%
Customer B        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage       16.00%
Customer C        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage 25.00%   20.00%  
Customer D        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage   10.00%   12.00%
Customer E        
Revenues From External Customers And Long Lived Assets [Line Items]        
Concentration risk percentage 10.00% 39.00%   28.00%