Statements of Operations and Comprehensive Loss (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Research and development expenses, related party	$ 849	$ 1,023	$ 2,695	$ 1,676
General and administrative expenses, related party	$ 0	$ 62	$ 16	$ 139