Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($) Customer Manufacturer $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($)
Basis Of Presentation [Line Items]
Common stock, par value (in usd per share) | $ / shares	$ 0.001	$ 0.001
Preferred stock, par value (in usd per share) | $ / shares	$ 0.001	$ 0.001
Number of contract manufacturers | Manufacturer	3
Percentage of amount due to vendors payable	30.30%	6.30%
Number of customers | Customer	3
FDIC insurance coverage	$ 250,000
Net deposit amount exceeding specified amount under FDIC	$ 65,100,000	$ 43,600,000
Discount for prompt payment	2.00%
Percentage of prompt payment discount, accrued	100.00%
Allowance for prompt payment of discount	$ 900,000	300,000
Allowance for doubtful accounts receivable	0	0
Inventory reserve	384,000	187,000
Depreciation	300,000	1,000,000.0	$ 700,000
Impairment loss	0	78,000	0
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
Research and development	$ 0	4,903,000	13,040,000
Advertising expenses	10,800,000	4,500,000	3,800,000
Shipping and handling costs	$ 21,590,000	$ 15,783,000	$ 19,496,000
Sales Revenue, Net | Customer Concentration Risk
Basis Of Presentation [Line Items]
Percentage of amount due to major vendors accounts payable	94.00%	92.00%	92.00%
BUNAVAIL
Basis Of Presentation [Line Items]
Inventory reserve	$ 200,000
Depreciation	1,500,000
Impairment loss	0	$ 0	$ 0
Reserve liability, product returns	2,200,000
Shipping and Handling
Basis Of Presentation [Line Items]
Shipping and handling costs	$ 30,000.00	$ 20,000.00	$ 10,000.00
Minimum
Basis Of Presentation [Line Items]
Estimated useful lives of equipment	3 years
Maximum
Basis Of Presentation [Line Items]
Estimated useful lives of equipment	10 years