Fair Value Measurement - Classification by level of input within the fair value hierarchy (Details) - Recurring basis - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Liabilities
Derivative liability - Class A Common Stock warrants	$ 240	$ 1,146
2022 Convertible Notes		8,152
Warrant liability - Series m-3 Preferred Stock
Liabilities
Warrant liability	245	1,282
Warrant liability - Series s Preferred Stock
Liabilities
Warrant liability	4,857	8,729
Money market funds
Assets
Money market funds	852	3,025
Level 1 | Money market funds
Assets
Money market funds	852	3,025
Level 3
Liabilities
Derivative liability - Class A Common Stock warrants	240	1,146
2022 Convertible Notes		8,152
Level 3 | Warrant liability - Series m-3 Preferred Stock
Liabilities
Warrant liability	245	1,282
Level 3 | Warrant liability - Series s Preferred Stock
Liabilities
Warrant liability	$ 4,857	$ 8,729