CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (69,987)	$ (32,711)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	1,370	753
Stock‑based compensation expense	7,013	1,068
Amortization of premiums and discounts on marketable securities, net	255	0
(Gain) loss on disposal of property and equipment	(1)	153
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(12,020)	(449)
Right-of-use assets, operating leases	5,609
Other non-current assets	(82)	(1,923)
Accounts payable	694	311
Accrued expenses and other current liabilities	6,104	2,138
Operating lease liabilities	(5,437)
Deferred rent		339
Net cash used in operating activities	(66,482)	(30,321)
Cash flows from investing activities:
Purchases of property and equipment	(2,179)	(3,258)
Purchases of marketable securities	(221,977)	0
Maturities of marketable securities	56,714	0
Net cash used in investing activities	(167,442)	(3,258)
Cash flows from financing activities:
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	0	115,831
Proceeds from exercise of stock options	121	347
Proceeds from the early exercise of stock options	0	528
Net cash provided by financing activities	121	116,706
Net increase (decrease) in cash, cash equivalents, and restricted cash	(233,803)	83,127
Cash, cash equivalents, and restricted cash at beginning of period	291,064	39,045
Cash, cash equivalents, and restricted cash at end of period	57,261	122,172
Supplemental cash flow disclosures:
Deferred financing costs in accounts payable and accrued expenses	0	505
Purchases of property and equipment included in accounts payable and accrued expenses	32	832
Right-of-use assets obtained in exchange for operating lease liabilities	32,991
Transfer of deposits for equipment from operating to investing cash flows	495	0
Vesting of options early exercised subject to repurchase	$ 102	$ 195