Business Segment, Concentration of Credit Risk and Significant Customers - Schedule of Customers Who Accounted for at Least 10% of Total Net Revenue (Detail) - Net Revenues - Customer Concentration	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Customer A
Significant Customers
Percentage of concentration risk	37.00%	30.00%
Customer B
Significant Customers
Percentage of concentration risk	22.00%	14.00%
Customer C
Significant Customers
Percentage of concentration risk	10.00%	17.00%
Customer D
Significant Customers
Percentage of concentration risk	10.00%
Customer E
Significant Customers
Percentage of concentration risk		13.00%