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Income Taxes - Summary of Net Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Accrued expenses $ 2,881 $ 3,455
Provision for excess and obsolete inventory 4,913 1,576
Depreciation and amortization 9,655 5,613
Net operating loss and tax credit carryforwards 105,143 96,848
Share-based compensation 2,203 1,685
Unrecognized tax benefits 1,510 1,407
Deferred tax assets 126,305 110,584
Deferred tax liabilities:    
Convertible senior notes (9,535) (12,207)
Purchased intangible assets (6,790) (6,868)
Deferred tax liabilities (16,325) (19,075)
Valuation allowance (114,419) (94,984)
Net deferred tax liabilities $ (4,439) $ (3,475)