Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions
Revenues	$ 139	$ 298	$ 23,995
Income (Loss) From Operations	(100,760)	(87,090)	(47,800)
Net loss	$ (101,944)	$ (87,758)	$ (58,574)
Weighted Average Number of Shares Issued, Basic	165,733	145,652	110,841
Earnings Per Share, Basic	$ (0.62)	$ (0.60)	$ (0.53)