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Equity Incentive Plans and Stock-Based Compensation (Details 2) (Stock Option Plans, USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Stock Options with Market Condition | Dec. 31, 2013 Stock Options with Market Condition
Number of Shares |  |  |  |
Outstanding, at the beginning of the period (in shares) | 11,377,146 |  | 1,315,000 | 1,315,000
Options granted (in shares) | 1,797,462 | 1,619,437 |  |
Options exercised (in shares) | (206,843) |  |  |
Options forfeited (in shares) | (269,083) |  |  |
Outstanding, at the end of the period (in shares) | 12,698,682 |  | 1,315,000 | 1,315,000
Vested or expected to vest at the end of the period (in shares) | 11,752,766 |  |  |
Options exercisable at the end of the period (in shares) | 6,303,547 |  |  |
Weighted Average Exercise Price |  |  |  |
Outstanding at the beginning of the year (in dollars per shares) | $ 11.32 |  |  |
Options granted (in dollars per share) | $ 8.78 |  |  |
Options exercised (in dollars per share) | $ 6.73 |  |  |
Options forfeited (in dollars per share) | $ 15.20 |  |  |
Outstanding at the end of the period (in dollars per shares) | $ 10.95 |  |  |
Vested or expected to vest at the end of the period (in dollars per share) | $ 11.25 |  |  |
Options exercisable at the end of the period (in dollars per share) | $ 14.94 |  |  |
Weighted Average Remaining Contractual Term |  |  |  |
Outstanding | 6 years 1 month 16 days |  |  |
Vested or expected to vest | 5 years 10 months 28 days |  |  |
Options exercisable | 3 years 8 months 26 days |  |  |
Aggregate Intrinsic Value |  |  |  |
Outstanding | $ 36,153 |  |  |
Vested or expected to vest | 32,643 |  |  |
Options exercisable | $ 10,850 |  |  |
Closing stock price (in dollars per share) | $ 10.75 |  |  |
Total number of in-the-money outstanding (in shares) | 8,833,026 |  |  |
Total number of in-the-money exercisable (in shares) | 2,656,578 |  |  |

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