Organization - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Aug. 14, 2023	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Intended percentage of reduction in workforce	80.00%	60.00%	60.00%
Cash, cash equivalents and restricted cash		$ 11,944	$ 11,944	$ 52,996	$ 51,745	$ 76,054
Accumulated deficit		$ 907,924	$ 907,924	$ 880,627
Common stock, shares authorized		520,000,000	520,000,000	420,000,000
Common stock, shares outstanding		240,627,055	240,627,055	240,410,761
Strategic advisor name	Cantor
Research and Development [Member]
Reversal of accrued expenses		$ 300	$ 1,000
Common Stock [Member]
Common stock, shares outstanding		240,627,055	240,627,055
Common stock reserved for future issuance		35,339,371	35,339,371