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Revenue Recognition and Accounts Receivable - Schedule of Components of Net Sales (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue Recognition [Abstract]        
Product sales $ 62,435 $ 99,865 $ 153,856 $ 193,799
Marketing service fees 10,700 15,985 24,102 31,163
Net sales $ 73,135 $ 115,850 $ 177,958 $ 224,962