Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accrued and other current liabilities:
Accrued research and development expenses	$ 300	$ 1,055
Accrued employee expenses	288	456
Professional services	180	743
Other accrued expenses	2,558	121
Total accrued and other current liabilities	$ 3,326	$ 2,375