CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (21,671)	$ (8,380)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	390	199
Stock‑based compensation expense	1,794	164
Amortization of premiums and discounts on marketable securities, net	142	0
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(1,670)	(66)
Right-of-use assets, operating leases	1,582	0
Other non-current assets	(562)	23
Accounts payable	2,061	(268)
Accrued expenses and other current liabilities	(1,526)	(510)
Operating lease liabilities	(1,531)	0
Deferred rent	0	502
Net cash used in operating activities	(20,991)	(8,336)
Cash flows from investing activities:
Purchases of property and equipment	(594)	(908)
Purchases of marketable securities	(182,653)	0
Maturities of marketable securities	1,714	0
Net cash used in investing activities	(181,533)	(908)
Cash flows from financing activities:
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	0	116,248
Proceeds from exercise of stock options	50	29
Proceeds from the early exercise of stock options	0	108
Net cash provided by financing activities	50	116,385
Net increase (decrease) in cash, cash equivalents, and restricted cash	(202,474)	107,141
Cash, cash equivalents, and restricted cash at beginning of period	291,064	39,045
Cash, cash equivalents, and restricted cash at end of period	88,590	146,186
Supplemental cash flow disclosures:
Deferred financing costs in accounts payable and accrued expenses	0	418
Purchases of lessor-owned assets in accrued expenses	370	0
Purchases of property and equipment included in accounts payable and accrued expenses	391	462
Right-of-use assets obtained in exchange for operating lease liabilities	32,991	0
Transfer of deposits for equipment from operating to investing cash flows	495	0
Vesting of options early exercised subject to repurchase	$ 35	$ 8