Business Segment, Geographic and Major Customer Information - Major Customers (Details) - Customer Concentration Risk - Sales	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Customer A
Segment Reporting Information
Percentage of revenue by major customers (in percentage)	22.60%	17.60%	29.40%	15.40%
Customer B
Segment Reporting Information
Percentage of revenue by major customers (in percentage)	14.00%	11.00%	12.50%	11.30%
Customer C
Segment Reporting Information
Percentage of revenue by major customers (in percentage)			12.30%	10.70%