Accounts Receivable - Accounts Receivable, Net of Allowances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Accounts receivable	$ 91,513	$ 85,292
Less: allowance for doubtful accounts and sales returns	(3,013)	(3,497)
Accounts Receivable, Net, Current, Total	$ 88,500	$ 81,795