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Employee Stock and Benefit Plans Plan Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended | 9 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2012
Stock Options [Member]
|
Sep. 30, 2011
Stock Options [Member]
|
Sep. 30, 2012
Stock Options [Member]
|
Sep. 30, 2011
Stock Options [Member]
|
Sep. 30, 2012
2000 Equity Incentive Plan [Member]
|
Sep. 30, 2012
2000 Equity Incentive Plan [Member]
Stock Options [Member]
|
Dec. 31, 2011
2000 Equity Incentive Plan [Member]
Stock Options [Member]
|
Sep. 30, 2012
2000 Equity Incentive Plan [Member]
Stock Options [Member]
Minimum [Member]
|
Sep. 30, 2012
2012 Equity Incentive Plan [Member]
|
Sep. 30, 2012
Increase of Number of Shares Option [Member]
|
Sep. 30, 2012
Increase of Percentage of Shares Outstanding Option [Member]
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||
| Number of shares authorized | 11,987,853 | 3,050,000 | |||||||||
| Award strike price as a percentage of market value | 85.00% | ||||||||||
| Award vesting period | 4 years | ||||||||||
| Term of award | 10 years | ||||||||||
| Number of shares subject to repurchase (in shares) | 58,534 | 76,437 | |||||||||
| Number of unvested shares repurchased (in shares) | 0 | 3,334 | 60,125 | 10,001 | |||||||
| Liability for options early exercised | $ 358 | $ 414 | |||||||||
| Equity incentive plan annual increase (in shares) | 3,050,000 | ||||||||||
| Equity incentive plan, annual increase, percent of shares outstanding | 5.00% | ||||||||||