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Organization and Description of Business (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	May 21, 2020 USD ($) $ / shares shares	Feb. 14, 2020 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) program	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating losses			$ 747,064	$ 514,021	$ 384,734
Shares of common stock issued (in shares) | shares	17,600,000	30,263,158
Price per share (usd per share) | $ / shares	$ 76.00	$ 19.00
Aggregate net proceeds from the offering	$ 1,300,000	$ 549,500
Accumulated deficit			$ 2,243,518	$ 1,496,454
Development programs | program			21

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