Stockholders' Equity - Amounts Related to Option Exercises (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]
Total intrinsic value of options exercised	$ 90,290	$ 442,156	$ 318,310	$ 745,382
Cash received from options exercised	$ 19,749	$ 89,060	$ 67,820	$ 132,754