Revenue Recognition and Accounts Receivable - Schedule of Components of Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue Recognition [Abstract]
Product sales	$ 96,305	$ 97,833	$ 250,161	$ 291,632
Marketing service fees	14,680	15,666	38,782	46,829
Net sales	$ 110,985	$ 113,499	$ 288,943	$ 338,461