Employee Stock-Based Compensation (Textual 1 - Employee Stock-Based Compensation) - Additional Information (Detail)
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Sep. 30, 2014
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Dec. 31, 2013
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Number of equity incentive plans | 2 | |
2004 Plan
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Outstanding options granted | 652,810 | 670,744 |
2006 Plan
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Outstanding options granted | 5,192,221 | 5,533,618 |
Common stock reserved for issuance | 10,329,472 | |
2006 Plan | Outstanding options and RSUs granted (RSUs)
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Shares subject to outstanding options and RSUs | 5,854,567 | |
Shares available for future grant | 2,381,075 |