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Stockholders' Equity, Stock Plans (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2009 shares | Dec. 31, 2019 Officer Installment $ / shares shares | Jun. 30, 2019 shares | Dec. 31, 2018 shares | May 31, 2017 shares | Jun. 30, 2015 shares | May 31, 2015 shares
Stock Options [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Number of options outstanding (in shares) |  | 11,001,000 |  | 11,311,000 |  |  |
Number of options exercisable (in shares) |  | 6,004,000 |  |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |
1989 Stock Option Plan [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Number of shares authorized (in shares) |  | 20,000,000.0 |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |
Award term |  | 7 years |  |  |  |  |
Number of options outstanding (in shares) |  | 100,000 |  |  |  |  |
Number of options exercisable (in shares) |  | 100,000 |  |  |  |  |
Number of shares available for grant (in shares) |  | 40,000.00 |  |  |  |  |
1989 Stock Option Plan [Member] | Stock Options [Member] | One Year from Date of Grant [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |  |
Period before options are exercisable |  | 1 year |  |  |  |  |
2011 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  | 23,000,000.0 |  | 16,000,000.0 | 11,000,000.0 | 5,500,000
Number of options outstanding (in shares) |  | 10,000,000.0 |  |  |  |  |
Number of options exercisable (in shares) |  | 5,400,000 |  |  |  |  |
Number of awards outstanding (in shares) |  | 1,700,000 |  |  |  |  |
Number of shares available for grant (in shares) |  | 7,400,000 |  |  |  |  |
Number of executive officers terminated before change in control when vesting will accelerate for executive officers | Officer |  | 1 |  |  |  |  |
Period before change in control when vesting will accelerate for executive officers |  | 3 months |  |  |  |  |
Period after change in control when vesting will accelerate for executive officers |  | 12 months |  |  |  |  |
2011 Equity Incentive Plan [Member] | Stock Options [Member] | Minimum [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Vesting period |  | 2 years |  |  |  |  |
2011 Equity Incentive Plan [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |
2011 Equity Incentive Plan [Member] | Restricted Stock Units [Member] | Minimum [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |
2002 Non-Employee Directors' Stock Option Plan [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  | 2,000,000.0 | 1,200,000
Award term |  | 10 years |  |  |  |  |
Number of options outstanding (in shares) |  | 900,000 |  |  |  |  |
Number of options exercisable (in shares) |  | 500,000 |  |  |  |  |
Number of awards outstanding (in shares) |  | 100,000 |  |  |  |  |
Number of shares available for grant (in shares) |  | 100,000 |  |  |  |  |
2002 Non-Employee Directors' Stock Option Plan [Member] | One Year from Date of Grant [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Number of equal annual installments over which options become exercisable | Installment |  | 4 |  |  |  |  |
2002 Non-Employee Directors' Stock Option Plan [Member] | Stock Options [Member] | One Year from Date of Grant [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Period before options are exercisable |  | 1 year |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Stock Plans [Abstract] |  |  |  |  |  |  |
Number of shares authorized (in shares) |  | 3,700,000 |  |  |  |  |
Number of shares available for grant (in shares) |  | 700,000 |  |  |  |  |
Number of additional shares reserved for issuance (in shares) | 150,000 | 150,000 |  |  |  |  |
Maximum percentage of employee compensation used to purchase shares |  | 10.00% |  |  |  |  |
Percentage of fair market value used to determine purchase price of stock |  | 85.00% |  |  |  |  |
Holding period for purchased stock |  | 6 months |  |  |  |  |
Shares purchased and issued under ESPP (in shares) |  | 50,000.00 |  |  |  |  |
Purchase price (in dollars per share) | $ / shares |  | $ 40.95 |  |  |  |  |

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