Fair Value Disclosure - Schedule of Financial Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Restricted cash	$ 434	$ 1,854
Total assets measured and recorded at fair value	1,093,249	517,333
Level 1
Assets:
Restricted cash		1,854
Total assets measured and recorded at fair value		517,333
Cash
Assets:
Cash and cash equivalents	1,021,022	463,820
Cash | Level 1
Assets:
Cash and cash equivalents		463,820
Money Market Fund
Assets:
Cash and cash equivalents	$ 71,793	51,659
Money Market Fund | Level 1
Assets:
Cash and cash equivalents		$ 51,659