Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Receivables [Abstract]
Accounts receivable, gross	$ 6,364	$ 5,198
Wholesaler distribution fees and prompt pay discounts	(1,358)	(868)
Reserve for returns	(913)	(313)
Accounts receivable, net	$ 4,093	$ 4,017

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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