Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 77,821	$ 90,584
Short-term investments	44,267	56,835
Prepaid expenses and other current assets	4,920	5,682
Insurance recovery receivable related to legal settlement (Note 7)	1,628	1,628
Total current assets	128,636	154,729
Restricted cash	631	631
Property and equipment, net	3,144	3,388
Operating lease right-of-use asset	992	1,049
Other long-term assets	55	448
Total assets	133,458	160,245
Current liabilities:
Accounts payable	681	129
Accrued liabilities	14,537	18,343
Accrued legal settlement	10,000	10,000
Current operating lease liability	380	368
Total current liabilities	25,598	28,840
Operating lease liability, less current portion	1,118	1,217
Total liabilities	26,716	30,057
Stockholders' equity:
Common stock, $0.0001 par value; 900,000,000 shares authorized at March 31, 2024 and December 31, 2023, respectively; 38,326,652 and 38,172,603 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively	4	4
Additional paid-in capital	442,418	439,739
Accumulated other comprehensive loss	(137)	(349)
Accumulated deficit	(335,543)	(309,206)
Total stockholders' equity	106,742	130,188
Total liabilities and stockholders' equity	$ 133,458	$ 160,245