Segment Reporting, Geographic Information and Concentration of Credit Risk - Additional Information (Detail) - Customer	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting [Abstract]
Concentration Risk, Customer		No customer accounted for 10% or more of net revenue for either of the three or nine months ended September 30, 2020 or 2019. No customer accounted for 10% of net accounts receivable as of September 30, 2020 or December 31, 2019.
Number of major customer represented stated percentage of total net revenue	0	0
Number of customers who accounted for 10% or more net accounts receivable		0	0