Notes Payable - Composition of debt (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Notes Payable.
Gross proceeds	$ 75,000
Contractual exit fee	2,003
Unamortized debt discount and issuance costs	(4,520)
Total note payable	72,483
Current portion of note payable	7,700
Non-current portion of note payable	64,783	$ 71,018
Total note payable	$ 72,483