|
Assumptions Used to Estimate Fair Value of Stock Options Granted and Stock Purchase Rights Granted Under our Employee Stock Purchase Plan (Detail)
|
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2014
|
Sep. 30, 2013
|
|
|
Options
|
||
| Expected volatility, minimum | 42.39% | 50.03% |
| Expected volatility, maximum | 49.94% | 53.58% |
| Risk-free interest rate, minimum | 1.62% | 0.77% |
| Risk-free interest rate, maximum | 1.78% | 1.40% |
| Expected dividend yield | 0.00% | 0.00% |
|
Options | Minimum
|
||
| Expected term (years) | 5 years 6 months 11 days | 5 years 7 months 10 days |
|
Options | Maximum
|
||
| Expected term (years) | 5 years 6 months 26 days | 5 years 8 months 1 day |
|
Employee Stock
|
||
| Expected volatility, minimum | 21.40% | 28.63% |
| Expected volatility, maximum | 62.24% | 41.52% |
| Expected term (years) | 1 year 3 months | 1 year 3 months |
| Risk-free interest rate, minimum | 0.05% | 0.08% |
| Risk-free interest rate, maximum | 0.47% | 0.35% |
| Expected dividend yield | 0.00% | 0.00% |