Income Taxes - Summary of Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Accrued expenses	$ 11,292	$ 6,271
Inventory obsolescence provision	3,539	1,992
Depreciation and amortization	4,136	6,680
Deferred rent	559	892
Net operating loss and tax credit carryforwards	55,010	42,994
Stock-based compensation	4,518	6,069
Unrecognized tax benefits	1,190	613
Deferred tax assets	80,244	65,511
Deferred tax liabilities:
Amortization of acquired intangibles	(699)	(1,016)
Net deferred tax assets	79,545	64,495
Valuation allowance	(79,458)	(63,881)
Net deferred tax assets	$ 87	$ 614