Quarterly report pursuant to Section 13 or 15(d)

Concentration of Credit Risk - Additional Information (Details)

v3.19.3
Concentration of Credit Risk - Additional Information (Details) - Vendor
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
China        
Concentration Risk [Line Items]        
Number of vendors 2   2  
Customer Concentration Risk | Net Revenue        
Concentration Risk [Line Items]        
Concentration risk percentage 10.00% 10.00% 10.00% 10.00%
Customer Concentration Risk | Net Revenue | China        
Concentration Risk [Line Items]        
Concentration risk percentage 71.00% 79.00% 72.00% 73.00%
Customer Concentration Risk | Trade Accounts Receivable        
Concentration Risk [Line Items]        
Concentration risk percentage 10.00% 10.00% 10.00% 10.00%