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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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|---|---|---|---|---|
| Income Tax Disclosure [Abstract] | ||||
| Net operating loss carryforwards and credits | $ 19,552 | $ 24,883 | ||
| Acquired intangible assets | 7,543 | 8,121 | ||
| Reserves and accruals | 1,656 | 2,149 | ||
| Share-based compensation | 2,775 | 2,438 | ||
| Depreciation | 346 | 268 | ||
| Total deferred income tax assets | 31,872 | 37,859 | ||
| Deferred income tax liabilities: | ||||
| Acquired intangible assets | (96) | (213) | ||
| Other | (4) | (6) | ||
| Total deferred income tax liabilities | (100) | (219) | ||
| Valuation allowance | (1,500) | (37,726) | (39,049) | (39,373) |
| Deferred income tax asset (liability), net | $ 30,272 | $ (86) |