Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Money market accounts	$ 637,048	$ 221,407
Total	637,048	221,407
Level 1
Assets:
Money market accounts	637,048	221,407
Total	637,048	221,407
Level 2
Assets:
Money market accounts	0	0
Total	0	0
Level 3
Assets:
Money market accounts	0	0
Total	$ 0	$ 0