Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock and Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance (in shares) at Dec. 31, 2017			433,392,686
Beginning Balance at Dec. 31, 2017	$ 3,581,956		$ 1,871,396	$ (20,557)	$ 1,731,117
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,211,242				1,211,242
Other comprehensive income (loss)	$ 975			975
Issuance of common stock upon exercise of options (in shares)	3,205,911		3,205,911
Issuance of common stock upon exercise of options	$ 123,935		$ 123,935
Stock-based compensation expense	320,657		$ 320,657
Ending Balance (in shares) at Dec. 31, 2018			436,598,597
Ending Balance at Dec. 31, 2018	$ 5,238,765	$ 2,474	$ 2,315,988	(19,582)	2,942,359	$ 2,474
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Net income	$ 1,866,916				1,866,916
Other comprehensive income (loss)	$ (3,939)			(3,939)
Issuance of common stock upon exercise of options (in shares)	2,208,052		2,208,052
Issuance of common stock upon exercise of options	$ 72,565		$ 72,565
Stock-based compensation expense	405,376		$ 405,376
Ending Balance (in shares) at Dec. 31, 2019			438,806,649
Ending Balance at Dec. 31, 2019	7,582,157		$ 2,793,929	(23,521)	4,811,749
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,761,395				2,761,395
Other comprehensive income (loss)	$ 67,919			67,919
Issuance of common stock upon exercise of options (in shares)	4,088,612		4,088,612
Issuance of common stock upon exercise of options	$ 238,589		$ 238,589
Stock-based compensation expense	415,180		$ 415,180
Ending Balance (in shares) at Dec. 31, 2020			442,895,261
Ending Balance at Dec. 31, 2020	$ 11,065,240		$ 3,447,698	$ 44,398	$ 7,573,144