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Income Taxes - Summary of Net Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Accrued expenses $ 0 $ 1,921
Provision for excess and obsolete inventory 2,710 2,577
Depreciation and amortization 1,426 4,610
Interest expense limitation 2,769 0
Net operating loss and tax credit carryforwards 86,385 86,966
Share-based compensation 1,218 1,034
Unrecognized tax benefits 1,163 1,108
Deferred tax assets 95,671 98,216
Deferred tax liabilities:    
Convertible Notes 0 (4,353)
Purchased intangible assets (4,485) (6,280)
Accrued expenses (1,799) 0
Deferred tax liabilities (6,284) (10,633)
Valuation allowance (93,844) (92,844)
Net deferred tax liabilities $ (4,457) $ (5,261)