Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowances and reserves	$ 955	$ 818
Accrued expenses	2,331	3,674
Inventory reserves	9,631	8,532
Net operating loss carryforwards	43,427	41,965
Property and equipment	2,420	1,976
Stock-based compensation	2,377	2,168
Legal settlement	11,806	1,204
Goodwill	3,362	0
Income tax credit carryforwards	3,235	2,218
Total deferred tax assets	79,544	62,555
Valuation allowance	(63,612)	(58,781)
Total deferred tax assets, net of valuation allowance	15,932	3,774
Deferred tax liabilities:
Investment in foreign partnership	15,467	0
Intangible assets	465	2,881
Goodwill	0	1,518
Total deferred tax liabilities	15,932	4,399
Net deferred tax assets (liabilities)	$ 0	$ (625)