Annual report pursuant to Section 13 and 15(d)

Concentration of Credit Risk - Additional Information (Details)

v3.19.3.a.u2
Concentration of Credit Risk - Additional Information (Details) - Vendor
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
China      
Concentration Risk [Line Items]      
Number of vendors 2 2 2
Customer Concentration Risk | Net Revenue      
Concentration Risk [Line Items]      
Concentration risk percentage 10.00% 10.00% 10.00%
Customer Concentration Risk | Trade Accounts Receivable      
Concentration Risk [Line Items]      
Concentration risk percentage 10.00% 10.00%