Income Taxes - Components of Deferred Tax Assets/(Liabilities) (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Reserve for sales allowances and possible losses	$ 478,000	$ 611,000
Accrued expenses	938,000	1,375,000
Prepaid royalties	2,659,000	13,631,000
Accrued royalties	5,973,000	1,864,000
Inventory	10,751,000	6,146,000
State income taxes	19,000	26,000
Property and equipment	2,635,000	4,257,000
Original issue discount interest	0	(2,131,000)
Goodwill and intangibles	11,542,000	15,782,000
Share-based compensation	773,000	578,000
Share-based compensation	(2,121,000)	(2,524,000)
Interest limitation	2,210,000	0
Federal and state net operating loss carryforwards	46,759,000	14,091,000
Credit carryforwards	1,121,000	35,195,000
Other	(633,000)	22,000
Gross	83,104,000	88,923,000
Valuation allowance	(84,097,000)	(89,706,000)
Total net deferred tax liabilities	(993,000)	$ (783,000)
Deferred tax assets	438,000
Deferred income tax liabilities	$ 1,431,000