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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 | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Stock Options with Market Condition | Dec. 31, 2012 Stock Options with Market Condition
Number of Shares |  |  |  |  |  |
Outstanding, at the beginning of the period (in shares) |  |  | 13,094,815 |  | 1,445,000 | 1,535,000
Options granted (in shares) | 141,575 | 2,590,711 | 1,897,887 | 7,592,911 |  |
Options exercised (in shares) |  |  | (268,493) |  |  |
Options forfeited (in shares) |  |  | (2,330,448) |  |  |
Outstanding, at the end of the period (in shares) | 12,393,761 |  | 12,393,761 |  | 1,445,000 | 1,535,000
Vested or expected to vest at the end of the period (in shares) | 11,652,306 |  | 11,652,306 |  |  |
Options exercisable at the end of the period (in shares) | 6,562,258 |  | 6,562,258 |  |  |
Weighted Average Exercise Price |  |  |  |  |  |
Outstanding at the beginning of the year (in dollars per shares) |  |  | $ 12.79 |  |  |
Options granted (in dollars per share) |  |  | $ 5.80 |  |  |
Options exercised (in dollars per share) |  |  | $ 6.84 |  |  |
Options forfeited (in dollars per share) |  |  | $ 12.10 |  |  |
Outstanding at the end of the period (in dollars per shares) | $ 11.98 |  | $ 11.98 |  |  |
Vested or expected to vest at the end of the period (in dollars per share) | $ 12.34 |  | $ 12.34 |  |  |
Options exercisable at the end of the period (in dollars per share) | $ 16.87 |  | $ 16.87 |  |  |
Weighted Average Remaining Contractual Term |  |  |  |  |  |
Outstanding |  |  | 5 years 7 months 10 days |  |  |
Vested or expected to vest |  |  | 5 years 5 months 12 days |  |  |
Options exercisable |  |  | 3 years 5 months 27 days |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |
Outstanding | $ 26,070 |  | $ 26,070 |  |  |
Vested or expected to vest | 23,406 |  | 23,406 |  |  |
Options exercisable | $ 5,877 |  | $ 5,877 |  |  |
Closing stock price (in dollars per share) | $ 9.40 |  | $ 9.40 |  |  |
Total number of in-the-money outstanding (in shares) | 7,645,637 |  | 7,645,637 |  |  |
Total number of in-the-money exercisable (in shares) | 2,268,480 |  | 2,268,480 |  |  |

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