Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 37,159	$ 74,555
Marketable securities	420,043	474,306
Prepaid expenses and other current assets	12,162	16,946
Total current assets	469,364	565,807
Property and equipment, net	18,216	21,861
Operating lease right-of-use assets	20,809	25,195
Restricted cash	1,546	1,546
Other assets	6,088	7,418
Total assets	516,023	621,827
Current liabilities:
Accounts payable	5,017	3,775
Accrued clinical supply costs	3,379	5,215
Accrued liabilities	25,696	30,378
Deferred revenue, current portion	55,427	82,975
Payable to collaboration partner	6,772	7,703
Refund liability to collaboration partner, current portion	37,554	39,440
Operating lease liabilities, current portion	8,680	8,462
Total current liabilities	142,525	177,948
Deferred revenue, long-term portion	192,775	210,845
Refund liability to collaboration partner, long-term portion	34,597	67,047
Operating lease liabilities, long-term portion	25,959	30,456
Other long-term liabilities	1,234	1,373
Total liabilities	397,090	487,669
Commitments and contingencies (Note 4)
Stockholders' equity:
Common stock, $0.0001 par value; 200,000,000 shares authorized; 97,929,897 and 84,879,693 shares issued and outstanding as of September 30, 2024 and December 31, 2023	9	8
Additional paid-in capital	945,046	844,044
Accumulated other comprehensive income	931	184
Accumulated deficit	(827,053)	(710,078)
Total stockholders' equity	118,933	134,158
Total liabilities and stockholders’ equity	$ 516,023	$ 621,827