CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 44,964	$ 31,360
Marketable securities	62,515	105,815
Prepaid expenses	3,831	3,153
Other current assets	507	475
Total current assets	111,817	140,803
Restricted cash equivalents	2,413	2,413
Property and equipment, net	9,165	10,050
Operating lease right-of-use assets	38,816	40,048
Other assets	4,819	4,812
Total assets	167,030	198,126
Current liabilities:
Accounts payable	2,325	815
Accrued liabilities	6,797	10,877
Operating lease liabilities	3,957	3,830
Other current liabilities	134	50
Total current liabilities	13,213	15,572
Long-term liabilities:
Operating lease liabilities—non-current	30,782	31,830
Total liabilities	43,995	47,402
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized as of March 31, 2024 and December 31, 2023; 0 shares issued and outstanding as of March 31, 2024 and December 31, 2023
Common stock, $0.0001 par value; 400,000,000 shares authorized as of March 31, 2024 and December 31, 2023; 68,223,496 and 67,901,610 shares issued and 68,215,771 and 67,891,311 outstanding as of March 31, 2024 and December 31, 2023, respectively	7	7
Additional paid-in capital	493,999	490,874
Accumulated other comprehensive loss	(87)	(77)
Accumulated deficit	(370,884)	(340,080)
Total stockholders' equity	123,035	150,724
Total liabilities and stockholders' equity	$ 167,030	$ 198,126