Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 70,042	$ 115,412
Marketable securities	392,434	439,396
Collaboration receivable	2,093	1,012
Prepaid expenses and other current assets	8,497	7,339
Total current assets	473,066	563,159
Property and equipment, net	21,252	18,778
Restricted cash	4,824	4,824
Operating lease right-of-use assets	88,766	91,877
Other long term assets	1,223	585
Total assets	589,131	679,223
Current liabilities:
Accounts payable	3,146	2,424
Accrued expenses	19,839	20,767
Lease liability, current portion	10,046	11,904
Total current liabilities	33,031	35,095
Long-term lease liability	67,819	70,014
Success Payment Liability	2,809	2,885
Deferred revenue non-current	20,014	20,014
Other long term liabilities	236	283
Total liabilities	123,909	128,291
Commitments and contingencies (See Note 7 and Note 8)
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized, 62,064,279 and 61,730,816 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	62	62
Additional paid-in capital	916,109	895,801
Accumulated other comprehensive loss	(754)	(694)
Accumulated deficit	(450,195)	(344,237)
Total stockholders equity	465,222	550,932
Total liabilities and stockholders' equity	$ 589,131	$ 679,223