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Income Taxes - Summary of Net Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Accrued expenses $ 1,921 $ 2,881
Provision for excess and obsolete inventory 2,577 4,913
Depreciation and amortization 4,610 9,655
Net operating loss and tax credit carryforwards 86,966 105,143
Share-based compensation 1,034 2,203
Unrecognized tax benefits 1,108 1,510
Deferred tax assets 98,216 126,305
Deferred tax liabilities:    
Convertible Notes (4,353) (9,535)
Purchased intangible assets (6,280) (6,790)
Deferred tax liabilities (10,633) (16,325)
Valuation allowance (92,844) (114,419)
Net deferred tax liabilities $ (5,261) $ (4,439)