Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 134,487	$ 375,145
Marketable securities	166,682	0
Tenant receivable	395	0
Prepaid expenses and other current assets	8,994	4,041
Total current assets	310,558	379,186
Property and equipment, net	23,435	25,886
Operating lease right-of-use assets	61,126	65,143
Restricted cash	5,692	5,692
Deferred offering costs	434	461
Other long-term assets	1,554	403
Total assets	402,799	476,771
Current liabilities:
Accounts payable	1,693	2,023
Accrued expenses and other current liabilities	8,995	12,177
Operating lease liability	6,630	4,608
Total current liabilities	17,318	18,808
Operating lease liability, net of current portion	76,732	76,217
Total liabilities	94,050	95,025
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, $0.0001 par value; 5,000,000 shares authorized and no shares issued or outstanding at June 30, 2022 and December 31, 2021	0	0
Common stock, $0.0001 par value; 150,000,000 shares authorized at June 30, 2022 and December 31, 2021; 57,597,141 and 56,980,701 shares issued at June 30, 2022 and December 31, 2021, respectively; 57,597,141 and 56,969,618 shares outstanding at June 30, 2022 and December 31, 2021, respectively	6	6
Additional paid-in capital	721,405	689,866
Accumulated other comprehensive income	(302)	0
Accumulated deficit	(412,360)	(308,126)
Total stockholders' equity	308,749	381,746
Total liabilities and stockholders' equity	$ 402,799	$ 476,771