Prepaid Expenses Other Assets Accrued Expenses and Other Liabilities - Schedule of Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued Liabilities And Other Liabilities [Abstract]
Accrued compensation and related expenses	$ 1,411	$ 98
Accrued severance	104	12
Accrued clinical	454	258
Accrued professional services	167	9
Accrued costs associated with PIPE financing		450
Accrued other	83	146
Total accrued expenses and other liabilities	$ 2,219	$ 973