Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Operating expenses
Research and development	$ 14,117	$ 17,334
General and administrative	13,504	14,043
Total operating expenses	27,621	31,377
Operating loss	(27,621)	(31,377)
Impairment charge on investment in equity securities	(1,710)	(2,990)
Interest income	4,050	4,343
Other expense, net	(223)	(70)
Loss before income taxes	(25,504)	(30,094)
Income taxes benefit	0	0
Net loss	$ (25,504)	$ (30,094)
Net loss per share of common stock - basic (in dollars per share)	$ (0.2)	$ (0.24)
Net loss per share of common stock - diluted (in dollars per share)	$ (0.2)	$ (0.24)
Weighted average shares outstanding used to compute net loss per share- basic (in shares)	125,859,276	126,081,602
Weighted average shares outstanding used to compute net loss per share - diluted (in shares)	125,859,276	126,081,602