Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 186,727	$ 125,744
Marketable securities	154,890	111,611
Receivable from collaboration partner	10,000	10
Prepaid expenses and other current assets	3,960	5,712
Total current assets	355,577	243,077
Property and equipment, net	1,195	1,565
Restricted cash - noncurrent	225	225
Operating lease right-of-use asset	954	3,061
Total assets	357,951	247,928
Current liabilities:
Accounts payable	772	3,640
Payable to collaboration partner	3	69
Accrued expenses and other payables	19,358	24,955
Operating lease liability - current	1,141	2,515
Total current liabilities	21,274	31,179
Operating lease liability - noncurrent		1,141
Total liabilities	21,274	32,320
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.00001 par value, 10,000,000 shares authorized; no shares issued and outstanding
Common stock, $0.00001 par value, 90,000,000 shares authorized; 57,708,613 and 49,339,252 shares issued and outstanding as of December 31, 2023 and 2022, respectively	1
Additional paid-in capital	952,491	752,722
Accumulated other comprehensive loss	(105)	(359)
Accumulated deficit	(615,710)	(536,755)
Total stockholders' equity	336,677	215,608
Total liabilities and stockholders' equity	$ 357,951	$ 247,928