Fair Value - Schedule of Fair Value Measurements (Details) - Fair value, recurring - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Level 1 | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 571,741	$ 0
Level 2 | Commercial paper (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	42,500
Money market funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, fair value disclosure	$ 197,835	$ 0