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Equity Incentive Plans and Stock-Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 Employee Stock Option | Dec. 31, 2011 Employee Stock Option | Dec. 31, 2010 Employee Stock Option | Jun. 22, 2012 Stock Option Exchange Program Employee Stock Option | Dec. 31, 2012 Stock Option Exchange Program Employee Stock Option | Dec. 31, 2012 Stock Options with Market Condition
Number of Shares |  |  |  |  |  |
Outstanding, at the beginning of the period (in shares) | 14,587,596 | 13,969,383 | 14,456,110 |  |  |
Options granted (in shares) | 7,789,220 | 2,357,001 | 1,921,743 |  | 2,840,986 | 1,795,000
Options exercised (in shares) | (221,934) | (873,691) | (996,946) |  |  |
Stock options forfeited (in shares) | (2,610,812) | (865,097) | (1,411,524) |  |  |
Options surrendered in stock option exchange program | (6,449,255) |  |  |  | (6,449,255) |
Outstanding, at the end of the period (in shares) | 13,094,815 | 14,587,596 | 13,969,383 |  |  | 1,535,000
Vested or expected to vest at the end of the period (in shares) | 12,185,462 |  |  |  |  |
Options exercisable at the end of the period (in shares) | 6,129,729 |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |
Outstanding at the beginning of the year (in dollars per shares) | $ 19.73 | $ 18.85 | $ 20.95 |  |  |
Options granted (in dollars per share) | $ 5.81 | $ 18.83 | $ 22.47 | $ 5.63 |  |
Options exercised (in dollars per share) | $ 4.44 | $ 8.46 | $ 12.95 |  |  |
Options forfeited (in dollars per share) | $ 10.91 | $ 14.53 | $ 49.43 |  |  |
Options surrendered in stock option exchange program ( in dollars per share) | $ 21.11 |  |  |  |  |
Outstanding at the end of the period (in dollars per shares) | $ 12.79 | $ 19.73 | $ 18.85 |  |  |
Vested or expected to vest at the end of the period (in dollars per share) | $ 13.24 |  |  |  |  |
Options exercisable at the end of the period (in dollars per share) | $ 19.21 |  |  |  |  |
Weighted Average Remaining Contractual Term (in years) |  |  |  |  |  |
Outstanding (in years) | 6 years 0 months 15 days |  |  |  |  |
Vested or expected to vest (in years) | 5 years 10 months 2 days |  |  |  |  |
Options exercisable (in years) | 3 years 7 months 2 days |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |
Outstanding | $ 755 |  |  |  |  |
Vested or expected to vest | 611 |  |  |  |  |
Options exercisable | $ 0 |  |  |  |  |
Closing stock price (in dollars per share) | $ 4.87 |  |  |  |  |
Total number of in-the-money outstanding (in shares) | 1,106,084 |  |  |  |  |
Total number of in-the-money exercisable (in shares) | 6,152 |  |  |  |  |

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