CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 15,658	$ 27,661
Short-term investments, available-for-sale	132,511	155,174
Accounts receivable	129	4
Prepaid expenses and other current assets	5,157	6,271
Total current assets	153,455	189,110
Long-term investments	23,315	21,657
Property and equipment, net of accumulated depreciation	276	224
Operating lease right-of-use assets	1,223	1,482
Other long-term assets	242	301
Total assets	178,511	212,774
Current liabilities:
Accounts payable	4,163	2,851
Accrued liabilities	17,939	15,592
Total current liabilities	22,102	18,443
Line of credit commitment fee	0	125
Lease-related obligations	827	1,177
Total liabilities	22,929	19,745
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000,000 shares authorized at June 30, 2024 and December 31, 2023; no shares issued and outstanding as of June 30, 2024 and December 31, 2023	0	0
Common stock, $0.001 par value, 200,000,000 shares authorized at June 30, 2024 and December 31, 2023; 89,632,385 and 88,929,300 shares issued and outstanding as of June 30, 2024 and December 31, 2023, respectively	90	89
Additional paid-in capital	993,778	988,457
Accumulated other comprehensive (loss) gain, net	(208)	7
Accumulated deficit	(838,078)	(795,524)
Total stockholders’ equity	155,582	193,029
Total liabilities and stockholders’ equity	$ 178,511	$ 212,774