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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)

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