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Income Taxes - Summary of Net Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Accrued expenses $ 3,134 $ 4,566
Inventory obsolescence provision 1,576 2,352
Depreciation and amortization 5,613 4,137
Deferred rent 321 555
Net operating loss and tax credit carryforwards 96,848 76,346
Stock-based compensation 1,685 1,910
Unrecognized tax benefits 1,407 1,296
Deferred tax assets 110,584 91,162
Deferred tax liabilities:    
Convertible Notes (12,207) 0
Acquired intangible assets (6,868) (388)
Deferred tax liabilities (19,075) (388)
Valuation allowance (94,984) (90,774)
Net deferred tax liabilities $ (3,475) $ 0