Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating expenses:
Research and development (includes related party amounts of $249, $0, $653, and $0 respectively)	$ 14,859	$ 2,772	$ 30,724	$ 3,201
In-process research and development		78,897		78,897
General and administrative (includes related party amounts of $34, $47, $77, and $18, respectively)	5,162	1,345	9,672	2,142
Total operating expenses	20,021	83,014	40,396	84,240
Loss from operations	(20,021)	(83,014)	(40,396)	(84,240)
Other income (expense):
Interest income	182	101	1,060	101
Interest expense (includes related party amounts of $0, $(71), $0 and $(82), respectively)	(1,262)	(1,137)	(2,000)	(1,148)
Change in fair value of warrant liabilities (includes related party amounts of $0, $(1,277), $0 and $(1,277), respectively)		(1,284)	95	(1,284)
Change in fair value of convertible promissory notes (includes related party amounts of $0, $(488), $0, and $(502), respectively)		(2,428)		(2,442)
Other income (expense)			(1)
Total other income (expense)	(1,080)	(4,748)	(846)	(4,773)
Net loss	$ (21,101)	$ (87,762)	$ (41,242)	$ (89,013)
Net loss per share, basic and diluted	$ (0.64)	$ (13.11)	$ (1.26)	$ (13.40)
Weighted-average shares of common stock outstanding, basic and diluted	32,997,099	6,694,682	32,733,750	6,640,394