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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

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