Stockholders' Equity - Options Outstanding Separated Into Range of Exercise Price (Details)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Class of Stock [Line Items]
Exercise price range, number of outstanding options (in shares) | shares	803,870,000
Exercise price range, outstanding options, weighted average remaining contractual term (in years)	2 years 9 months
Exercise price range, outstanding options, weighted average exercise price (in usd per share)	$ 7.077
Exercise price range, number of exercisable options (in shares) | shares	787,775,000
Exercise price range, exercisable options, weighted average remaining contractual term (in years)	2 years 7 months 20 days
Exercise price range, exercisable options, weighted average exercise price (in usd per share)	$ 7.106
Range One
Class of Stock [Line Items]
Exercise price range, lower range limit (in usd per share)	4.157
Exercise price range, upper range limit (in usd per share)	$ 5.682
Exercise price range, number of outstanding options (in shares) | shares	224,661,000
Exercise price range, outstanding options, weighted average remaining contractual term (in years)	2 years 11 months 15 days
Exercise price range, outstanding options, weighted average exercise price (in usd per share)	$ 4.883
Exercise price range, number of exercisable options (in shares) | shares	208,566,000
Exercise price range, exercisable options, weighted average remaining contractual term (in years)	2 years 6 months 21 days
Exercise price range, exercisable options, weighted average exercise price (in usd per share)	$ 4.808
Range Two
Class of Stock [Line Items]
Exercise price range, lower range limit (in usd per share)	6.503
Exercise price range, upper range limit (in usd per share)	$ 8.077
Exercise price range, number of outstanding options (in shares) | shares	433,307,000
Exercise price range, outstanding options, weighted average remaining contractual term (in years)	2 years 6 months 21 days
Exercise price range, outstanding options, weighted average exercise price (in usd per share)	$ 7.111
Exercise price range, number of exercisable options (in shares) | shares	433,307,000
Exercise price range, exercisable options, weighted average remaining contractual term (in years)	2 years 6 months 21 days
Exercise price range, exercisable options, weighted average exercise price (in usd per share)	$ 7.111
Range Three
Class of Stock [Line Items]
Exercise price range, number of outstanding options (in shares) | shares	120,180,000
Exercise price range, outstanding options, weighted average remaining contractual term (in years)	3 years 1 month 20 days
Exercise price range, outstanding options, weighted average exercise price (in usd per share)	$ 9.960
Exercise price range, number of exercisable options (in shares) | shares	120,180,000
Exercise price range, exercisable options, weighted average remaining contractual term (in years)	3 years 1 month 20 days
Exercise price range, exercisable options, weighted average exercise price (in usd per share)	$ 9.960
Range Four
Class of Stock [Line Items]
Exercise price range, number of outstanding options (in shares) | shares	25,722,000
Exercise price range, outstanding options, weighted average remaining contractual term (in years)	2 years 2 months 19 days
Exercise price range, outstanding options, weighted average exercise price (in usd per share)	$ 13.287
Exercise price range, number of exercisable options (in shares) | shares	25,722,000
Exercise price range, exercisable options, weighted average remaining contractual term (in years)	2 years 2 months 19 days
Exercise price range, exercisable options, weighted average exercise price (in usd per share)	$ 13.287