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Stock-Based Compensation - Employee Stock Purchase Plans - Additional Information (Detail) (USD $)
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9 Months Ended |
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Sep. 30, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Expected dividend yield | 0.00% |
| Unrecognized stock-based compensation expense | $ 19,859,000 |
| Unrecognized stock-based compensation expenses recognition period | 4 years 2 months 5 days |
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Employee Stock Purchase Plan [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Common stock reserved and available for issuance | 366,667 |
| ESPP offering period description | The offering periods generally start on the first trading day on or after May 15 and November 15 of each year. The first offering period began on May 15, 2014. |
| Length of purchase intervals | 6 months |
| Unrecognized stock-based compensation expense | $ 22,000 |
| Unrecognized stock-based compensation expenses recognition period | 1 month 13 days |
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- Definition
Employee Stock Purchase Plan Offering Period Description No definition available.
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- Definition
Represents the length of purchase intervals. No definition available.
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- Definition
Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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