Statements of Operations and Comprehensive Loss (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Research and development expenses, related party	$ 1,023	$ 207	$ 1,676	$ 207
General and administrative expenses, related party	62	156	139	174
Interest expense, related party	0	(302)	0	(498)
Change in fair value of warrant liabilities, related party	0	(57,754)	0	(59,031)
Change in fair value of convertible promissory notes, related party	$ 0	$ (732)	$ 0	$ (1,053)