Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Operating expenses:
Research and development	$ 3,343	$ 5,814	$ 7,436	$ 13,551
General and administrative	6,873	4,520	11,660	10,605
Impairment of long-lived assets				2,637
Net gain on lease terminations	(1,944)		(2,577)
Loss from operations	(8,272)	(10,334)	(16,519)	(26,793)
Other income (expense), net	451	949	1,139	2,003
Net loss	$ (7,821)	$ (9,385)	$ (15,380)	$ (24,790)
Per share information:
Net loss per share of common stock, basic	$ (2.44)	$ (2.96)	$ (4.8)	$ (7.83)
Net loss per share of common stock, diluted	$ (2.44)	$ (2.96)	$ (4.8)	$ (7.83)
Weighted average common shares outstanding, basic	3,208,744	3,168,933	3,207,313	3,166,437
Weighted average common shares outstanding, diluted	3,208,744	3,168,933	3,207,313	3,166,437
Comprehensive loss:
Net loss	$ (7,821)	$ (9,385)	$ (15,380)	$ (24,790)
Unrealized gain (loss) on marketable securities				(8)
Comprehensive loss	$ (7,821)	$ (9,385)	$ (15,380)	$ (24,798)