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Income Taxes - Summary of Net Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Accrued expenses | $ 3,134 | $ 4,566
Inventory obsolescence provision | 1,576 | 2,352
Depreciation and amortization | 5,613 | 4,137
Deferred rent | 321 | 555
Net operating loss and tax credit carryforwards | 96,848 | 76,346
Stock-based compensation | 1,685 | 1,910
Unrecognized tax benefits | 1,407 | 1,296
Deferred tax assets | 110,584 | 91,162
Deferred tax liabilities: |  |
Convertible Notes | (12,207) | 0
Acquired intangible assets | (6,868) | (388)
Deferred tax liabilities | (19,075) | (388)
Valuation allowance | (94,984) | (90,774)
Net deferred tax liabilities | $ (3,475) | $ 0

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