Stockholders' Equity, Stock Plans (Details)	12 Months Ended
	Dec. 31, 2023 Officer $ / shares shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares	Dec. 31, 2014 shares	Dec. 31, 2013 shares	Dec. 31, 2012 shares	Dec. 31, 2011 shares	Dec. 31, 2010 shares	Dec. 31, 2009 shares	Jun. 30, 2023 shares	Dec. 31, 2022 shares	Jun. 30, 2021 shares	Dec. 31, 2020 shares	Jun. 30, 2019 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)	14,091,000													14,970,000
Number of options exercisable (in shares)	9,703,000
1989 Stock Option Plan [Member]
Stock Plans [Abstract]
Number of shares authorized for issuance under the Plan (in shares)	20,000,000
Number of options outstanding (in shares)	0
Number of shares available for grant (in shares)	68,000
1989 Stock Option Plan [Member] | Stock Options [Member]
Stock Plans [Abstract]
Vesting period	4 years
Award term	7 years
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 for issuance under the Plan (in shares)													35,200,000		29,700,000		23,000,000	16,000,000	11,000,000	5,500,000
Reduction in fungible share reserve for each share issued pursuant to full value award (n shares)															(1.7)
Increase in fungible share reserve for each share returning from a full value award (in shares)															1.7
Number of options outstanding (in shares)	12,800,000
Number of options exercisable (in shares)	8,700,000
Number of shares available for grant (in shares)	8,000,000
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]
Stock Plans [Abstract]
Vesting period	4 years
Award term	7 years
2011 Equity Incentive Plan [Member] | Stock Options [Member] | Issued after December 31, 2021 [Member]
Stock Plans [Abstract]
Award term	10 years
2011 Equity Incentive 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] | Restricted Stock Units [Member]
Stock Plans [Abstract]
Vesting period	4 years
Number of awards outstanding (in shares)	3,300,000
2020 Equity Incentive Plan [Member]
Stock Plans [Abstract]
Number of shares authorized for issuance under the Plan (in shares)															1,600,000	2,600,000
Number of options outstanding (in shares)	400,000
Number of options exercisable (in shares)	100,000
Number of shares available for grant (in shares)	1,000,000
2020 Equity Incentive Plan [Member] | Stock Options [Member]
Stock Plans [Abstract]
Vesting period	4 years
Award term	7 years
2020 Equity Incentive Plan [Member] | Stock Options [Member] | Issued after December 31, 2021 [Member]
Stock Plans [Abstract]
Award term	10 years
2020 Equity Incentive 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
2020 Equity Incentive Plan [Member] | Restricted Stock Units [Member]
Stock Plans [Abstract]
Vesting period	4 years
Number of awards outstanding (in shares)	200,000
2002 Non-Employee Directors' Stock Option Plan [Member]
Stock Plans [Abstract]
Number of shares authorized for issuance under the Plan (in shares)						2,000,000	1,200,000									2,800,000
Number of options outstanding (in shares)	900,000
Number of options exercisable (in shares)	900,000
Number of shares available for grant (in shares)	500,000
2002 Non-Employee Directors' Stock Option Plan [Member] | Stock Options [Member]
Stock Plans [Abstract]
Award term	10 years
2002 Non-Employee Directors' Stock Option Plan [Member] | Restricted Stock Units [Member]
Stock Plans [Abstract]
Number of awards outstanding (in shares)	40,000
Employee Stock Purchase Plan [Member]
Stock Plans [Abstract]
Number of shares authorized for issuance under the Plan (in shares)	3,200,000
Number of additional shares reserved for issuance (in shares)		150,000	150,000	150,000	150,000	150,000	150,000	150,000	150,000	150,000	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)	100,000
Weighted average purchase price (in dollars per share) | $ / shares	$ 30.53
Shares available for purchase under ESPP (in shares)	400,000