Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) Manufacturer Customer $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)
Basis Of Presentation [Line Items]
Common Stock, par value | $ / shares	$ 0.001	$ 0.001
Preferred Stock, par value | $ / shares	$ 0.001
Number of contract manufacturers | Manufacturer	3
Percentage of amount due to vendors payable	6.30%	22.80%
Number of customers | Customer	3
FDIC insurance coverage	$ 250,000
Net deposit amount exceeding specified amount under FDIC	$ 43,600,000	$ 21,200,000
Discount for prompt payment	2.00%
Percentage of prompt payment discount, accrued	100.00%
Allowance for prompt payment of discount	$ 300,000	200,000
Allowance for Doubtful Accounts Receivable	0	0
Inventory obsolescence recorded	(56,000)	243,000
Impairment loss	78,000
Impairment charges recognized on finite lived intangibles assets	0	0	$ 0
Goodwill impairment charges	$ 0	0	0
Sales return maximum duration	18 months
Offered period for sales return prior to expiration	6 months
Offered period for sales return subsequent to expiration	12 months
Discount for prompt payment	2.00%
Advertising expenses	$ 4,500,000	3,800,000	4,200,000
Shipping and handling costs	15,783,000	$ 19,496,000	$ 11,258,000
Future minimum lease payments	$ 1,300,000
Subsequent Event [Member]
Basis Of Presentation [Line Items]
Right-of-use lease assets				$ 900,000
Lease liability				$ 1,000,000
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Basis Of Presentation [Line Items]
Total annual sales percentage	92.00%	92.00%	91.00%
BUNAVAIL [Member]
Basis Of Presentation [Line Items]
Impairment loss	$ 0	$ 0
Shipping and Handling [Member]
Basis Of Presentation [Line Items]
Shipping and handling costs	$ 20,000	$ 10,000	$ 10,000
Minimum [Member]
Basis Of Presentation [Line Items]
Period of payments from customers	30 days
Estimated useful lives of equipment	3 years
Accrual to payment cycle period	1 month
Maximum [Member]
Basis Of Presentation [Line Items]
Period of payments from customers	37 days
Estimated useful lives of equipment	10 years
Accrual to payment cycle period	3 months