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Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred tax assets: |  |
Accrued expenses | $ 6,271 | $ 4,941
Inventory obsolescence provision | 1,992 | 1,647
Depreciation and amortization | 6,680 | 4,626
Deferred rent | 892 | 409
Net operating loss and tax credit carryforwards | 42,994 | 32,569
Stock-based compensation | 6,069 | 5,662
Unrecognized tax benefits | 613 | 439
Deferred tax assets | 65,511 | 50,293
Deferred tax liabilities: |  |
Amortization of acquired intangibles | (1,016) | (12,777)
Net deferred tax assets | 64,495 | 37,516
Valuation allowance | (63,881) | (36,395)
Net deferred tax assets | $ 614 | $ 1,121

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