|
Stock-Based Compensation (Tables)
|
12 Months Ended |
|
Dec. 31, 2013
|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
|
| Summary of Option Activity |
A summary of the option activity under the Plans during the year ended December 31, 2013 is presented below: | | | | | | | | | | | | | | | Options Outstanding | | Shares | | Weighted Average Exercise Price Per Share | | Weighted-Average Remaining Contractual Term | | Aggregate Intrinsic Value | | | | | | (in years) | | (in thousands) | Balances at December 31, 2012 | 15,398,221 |
| | $ | 4.92 |
| | | | | Options granted | 1,341,550 |
| | 23.18 |
| | | | | Options exercised | (4,182,114 | ) | | 2.52 |
| | | | | Options canceled | (8,125 | ) | | 7.00 |
| | | | | Options forfeited | (313,132 | ) | | 8.92 |
| | | | | Balances at December 31, 2013 | 12,236,400 |
| | $ | 7.64 |
| | 7.4 | | $ | 749,944 |
| Vested and expected to vest at December 31, 2013 | 11,870,827 |
| | $ | 7.50 |
| | 7.3 | | $ | 729,272 |
| Exercisable at December 31, 2013 | 5,786,352 |
| | $ | 3.79 |
| | 6.0 | | $ | 376,947 |
|
|
| Summary of RSU Activity |
The following provides a summary of our RSU activity during the year ended December 31, 2013: | | | | | | | | | Number of Shares Underlying Outstanding RSUs | | Weighted-Average Grant-Date Fair Value per RSU | | | | | RSUs outstanding at December 31, 2012 | — |
| | $ | — |
| RSUs granted | 575,350 |
| | 64.04 |
| RSUs vested | — |
| | — |
| RSUs forfeited | (1,000 | ) | | 53.82 |
| Non-Vested outstanding at December 31, 2013 | 574,350 |
| | $ | 64.06 |
|
|
| Schedule Of Equity Based Awards Available |
The number of shares available for equity based awards (including stock options and RSUs) are available for issuance as follows: | | | | | Shares Available for Grant | Balance at December 31, 2012 | 6,907,924 |
| Granted | (1,916,900 | ) | Canceled | 8,125 |
| Forfeited | 314,132 |
| Balance at December 31, 2013 | 5,313,281 |
|
|
| Fair Value Assumptions |
For the years ended December 31, 2013, 2012 and 2011, the fair value of options was estimated using the Black-Scholes option pricing model with the following assumptions:
| | | | | | | | | | | Year Ended December 31, | | 2013 | | 2012 | | 2011 | Risk-free interest rates | 1.11 | % | | 0.69 | % | | 1.55 | % | Expected term | 5 years |
| | 5 years |
| | 5 years |
| Expected dividends | None |
| | None |
| | None |
| Expected volatility | 46.80 | % | | 49.0 | % | | 52.1 | % |
|