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Stock-Based Compensation - Plan Information (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2013
Stock Options
|
Sep. 30, 2013
Stock Options
|
Sep. 30, 2012
Stock Options
|
Sep. 30, 2013
2012 Equity Incentive Plan
|
Sep. 26, 2012
2012 Equity Incentive Plan
|
Sep. 26, 2012
2012 Equity Incentive Plan
Stock Options
|
Sep. 30, 2013
2000 Equity Incentive Plan
Stock Options
|
Dec. 31, 2012
2000 Equity Incentive Plan
Stock Options
|
Sep. 30, 2013
2000 Equity Incentive Plan
Stock Options
Minimum
|
Sep. 26, 2012
Increase of Number of Shares Option
|
Sep. 26, 2012
Increase of Percentage of Shares Outstanding Option
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||
| Number of shares authorized | 3,050,000 | ||||||||||
| Equity incentive plan annual increase (shares) | 3,050,000 | ||||||||||
| Equity incentive plan, annual increase, percent of shares outstanding | 5.00% | ||||||||||
| Award vesting period | 4 years | 4 years | |||||||||
| Term of award | 10 years | 10 years | |||||||||
| Expiration period | 10 years | ||||||||||
| Number of shares available for grant | 1,613,525 | ||||||||||
| Award strike price as a percentage of market value | 85.00% | ||||||||||
| Number of shares subject to repurchase (shares) | 20,336 | 47,220 | |||||||||
| Share-based compensation arrangement by share-based payment award, number of unvested shares repurchased | 125 | 125 | 60,125 | ||||||||
| Liability for options early exercised | $ 0.1 | $ 0.3 | |||||||||