Nature of Operations - Going Concern, Liquidity and Capital Resources (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Nature of Operations
Net working capital	$ 1,300						$ 1,300
Unrestricted cash	110,800						110,800
Restricted cash	225,800						225,800
Available-for-sale securities	388,768						388,768		$ 1,332,943
Equity securities	67,823						67,823		134,836
Accumulated deficit	3,847,349						3,847,349		3,120,911
Net loss attributable to common shareholders							726,400		724,000	$ 460,000	$ 596,200
Net cash used in operating activities							863,919	$ 522,049	$ 828,600	$ 358,200
Net loss attributable to the Company	$ 283,479	$ 236,398	$ 206,561	$ 170,758	$ 173,296	$ 156,489	$ 726,438	$ 500,543