Organization - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jul. 03, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Cash, cash equivalents and restricted cash	$ 1,938			$ 1,091	$ 1,683		$ 6,062
Accumulated deficit	$ 923,729			$ 920,446
Common stock, shares outstanding	2,205,846			1,601,252
Common stock, shares authorized	50,000,000			50,000,000
Minimum required amount of stockholder equity				$ 2,500
Total stockholders' equity	$ 2,803		$ 3,661	2,063	2,724	$ 3,771	6,307
2020 Equity Incentive Plan [Member]
Common stock, shares authorized	1,130,745
Maximum [Member]
Common stock, shares authorized		50,000,000
Maximum [Member] | 2020 Equity Incentive Plan [Member]
Common stock, shares authorized		1,130,745
Minimum [Member]
Common stock, shares authorized		5,000,000
Minimum [Member] | 2020 Equity Incentive Plan [Member]
Common stock, shares authorized		130,745
Common Stock [Member]
Common stock, shares outstanding	2,205,846
Common stock reserved for future issuance	394,301
Total stockholders' equity	$ 2		$ 2	$ 2	$ 2	$ 2	$ 2
Series A - 1 Preferred Stock [Member]
Common stock, shares outstanding	500
Series A - 2 Preferred Stock [Member]
Common stock, shares outstanding	850