Fair Value - Schedule of Financial Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Assets:
Restricted cash	$ 83	$ 434	$ 1,539
Total assets measured and recorded at fair value	2,077,597	1,093,249
Level 1
Assets:
Restricted cash	83	434
Total assets measured and recorded at fair value	2,077,597	1,093,249
Cash
Assets:
Cash and cash equivalents	2,005,720	1,021,022
Cash | Level 1
Assets:
Cash and cash equivalents	2,005,720	1,021,022
Money Market Fund
Assets:
Cash and cash equivalents	71,794	71,793
Money Market Fund | Level 1
Assets:
Cash and cash equivalents	$ 71,794	$ 71,793