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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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