Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accrued Liabilities, Current [Abstract]
Personnel expenses	$ 1,213		$ 820
Severance expense	261	$ 0	0
Professional fees	600		462
Research and development expenses	3,485		7,108
Current portion of operating lease liabilities	299		741
Other	121		180
Total accrued expenses and other current liabilities	$ 5,979		$ 9,311