Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 206,180	$ 115,412
Marketable securities	417,770	439,396
Collaboration receivable	5,897	1,012
Prepaid expenses and other current assets	8,102	7,339
Total current assets	637,949	563,159
Property and equipment, net	22,505	18,778
Restricted cash	4,774	4,824
Operating lease right-of-use assets	85,295	91,877
Other long term assets	2,165	585
Total assets	752,688	679,223
Current liabilities:
Accounts payable	6,636	2,424
Accrued expenses	20,178	20,767
Operating lease obligations, current portion	10,192	11,904
Total current liabilities	37,006	35,095
Long-term lease liability	64,715	70,014
Deferred revenue, non-current	48,556	20,014
Success payment liability	2,720	2,885
Other long term liabilities	189	283
Total liabilities	153,186	128,291
Commitments and contingencies (See Note 7 and 8)
Stockholders' equtiy
Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued and oustanding	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized, 81,969,693 and 61,730,816 shares issued and outstanding at December 31, 2023 and 2022, respectively	82	62
Additional paid-in capital	1,143,453	895,801
Accumulated other comprehensive loss	272	(694)
Accumulated deficit	(544,305)	(344,237)
Total stockholders' equity	599,502	550,932
Total liabilities and stockholders' equity	$ 752,688	$ 679,223