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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Reserves and accruals | $ 29,235 | $ 31,999 |  |
Net operating loss carryovers | 27,253 | 27,522 |  |
Research and development credit carryovers | 18,391 | 13,704 |  |
Deferred stock-based compensation | 7,554 | 7,684 |  |
Other tax credits | 2,738 | 2,207 |  |
Gross deferred tax assets | 85,171 | 83,116 |  |
Valuation allowance | (38,644) | (34,347) | (28,354) | (26,557)
Gross deferred tax assets after valuation allowance | 46,527 | 48,769 |  |
Deferred tax liabilities: |  |  |  |
Depreciation and amortization | (3,590) | (5,485) |  |
Intangibles | (6,227) | (11,656) |  |
Other | (738) | (483) |  |
Gross deferred tax liabilities | (10,555) | (17,624) |  |
Net deferred tax assets | $ 35,972 | $ 31,145 |  |

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