Liquidity, Going Concern and Management Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 266,073		$ 266,073		$ 343,226
Working capital deficit	49,500		49,500
Accumulated deficit	1,775,452		1,775,452		$ 1,558,088
Net loss from continuing operations	$ 84,485	$ 105,802	222,062	$ 329,129
ATM Offering
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Sale of stock, consideration received on transaction			116,900
Payments of stock issuance costs			$ 2,700
Number of shares issued in transaction			81,694,729
Sale of stock, price per share (in usd per share)	$ 1.46		$ 1.46