Stockholders' Equity - Amounts Related to Option Exercises (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]
Total intrinsic value of options exercised	$ 442,156	$ 212,932	$ 745,382	$ 393,774
Cash received from options exercised	$ 89,060	$ 21,896	$ 132,754	$ 44,868