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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