CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 143,034	$ 48,539
Investments	82,934
Prepaid expenses	5,355	467
Other current assets	749	100
Total current assets	232,072	49,106
Restricted cash equivalents	2,413	1,559
Property and equipment, net	5,990	4,728
Operating lease right-of-use assets	16,016	17,117
Other assets	2,141	3,398
Total assets	258,632	75,908
Current liabilities:
Accounts payable	1,957	2,361
Accrued expenses	5,676	6,260
Operating lease liability	1,147	863
Other current liabilities	430	723
Total current liabilities	9,210	10,207
Long-term liabilities:
Operating lease liabilities—non-current	16,465	17,430
Total liabilities	25,675	27,637
Stockholders’ equity (deficit):
Preferred stock, $0.0001 par value; 10,000,000 and 0 shares authorized as of September 30, 2021 and December 31, 2020, respectively; 0 shares issued and outstanding as of September 30, 2021 and December 31, 2020
Common stock, $0.0001 par value; 400,000,000 and 420,000,000 shares authorized as of September 30, 2021 and December 31, 2020 respectively; 37,247,414 and 893,231 shares issued and 37,018,282 and 505,074 outstanding as of September 30, 2021 and December 31, 2020, respectively	4	1
Additional paid-in capital	344,824	2,158
Accumulated deficit	(111,871)	(61,224)
Total stockholders’ equity (deficit)	232,957	(59,065)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit)	$ 258,632	75,908
Series A-1 Redeemable Convertible Preferred Stock
Long-term liabilities:
Redeemable convertible preferred stock		2
Series A-2 Redeemable Convertible Preferred Stock
Long-term liabilities:
Redeemable convertible preferred stock		42,786
Series B Redeemable Convertible Preferred Stock
Long-term liabilities:
Redeemable convertible preferred stock		$ 64,548