Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 95,650	$ 93,171
Marketable securities	192,999	185,920
Collaboration receivable	47,500	0
Tenant receivable	1,814	395
Prepaid expenses and other current assets	6,770	7,530
Total current assets	344,733	287,016
Property and equipment, net	22,030	22,215
Operating lease right-of-use assets	57,945	59,208
Restricted cash	5,692	5,692
Deferred offering costs	434	434
Other long-term assets	583	1,699
Total assets	431,417	376,264
Current liabilities:
Accounts payable	1,504	662
Accrued expenses and other current liabilities	7,647	11,402
Contract with customer liability, current	5,681	0
Operating lease liability	7,905	7,086
Total current liabilities	22,737	19,150
Contract with customer liability, noncurrent	55,085	0
Operating lease liability, net of current portion	74,456	74,621
Total liabilities	152,278	93,771
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.0001 par value; 5,000,000 shares authorized and no shares issued or outstanding at March 31, 2023 and December 31, 2022	0	0
Common stock, $0.0001 par value; 150,000,000 shares authorized at March 31, 2023 and December 31, 2022; 65,535,663 and 59,505,437 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	7	6
Additional paid-in capital	755,957	727,335
Accumulated other comprehensive income	34	(83)
Accumulated deficit	(476,859)	(444,765)
Total stockholders' equity	279,139	282,493
Total liabilities and stockholders' equity	$ 431,417	$ 376,264