Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating losses	$ 51,554	$ 27,047
Research and development credits	13,989	7,617
Accrued expenses	292	291
Other	775	474
Deferred rent	0	266
Lease liability	2,000	0
Stock based compensation	1,816	428
Total deferred tax assets	70,426	36,123
Deferred tax liabilities:
Fixed asset basis	(61)	(124)
Prepaid expenses	(921)	(558)
Right of use asset	(1,760)	0
Total deferred tax liabilities	(2,742)	(682)
Valuation allowance	67,684	35,441	$ 21,929
Net deferred taxes	$ 0	$ 0