Condensed Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,106)	$ (5,244)	$ (15,385)	$ (14,378)
Other comprehensive gain:
Net unrealized gain on available-for-sale securities	26		48
Total comprehensive loss	$ (5,080)	$ (5,244)	$ (15,337)	$ (14,378)