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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)

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