Statements of Operations and Comprehensive Loss (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Research and development expenses, related party	$ 905	$ 249	$ 1,846	$ 653
General and administrative expenses, related party	$ 0	$ 34	$ 16	$ 77