Liquidity, Going Concern and Management Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cash, cash equivalents, restricted cash, and restricted cash equivalents	$ 299,656		$ 299,656		$ 343,226
Working capital deficit	30,500		30,500
Accumulated deficit	1,691,641		1,691,641		$ 1,558,088
Net loss from continuing operations	$ 54,209	$ 94,964	137,577	$ 223,327
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