Annual report pursuant to Section 13 and 15(d)

Contingencies - Sales to Major Customers (Details)

v3.19.3.a.u2
Contingencies - Sales to Major Customers (Details) - Customer concentration risk - Revenue
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Company A      
Product Information [Line Items]      
Percentage of sales to major customers 14.00% 17.00% 40.00%
Company B      
Product Information [Line Items]      
Percentage of sales to major customers   10.00%