CONDENSED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating expenses:
Research and development	$ 2,706	$ 3,893	$ 4,490	$ 10,764
General and administrative	2,659	2,472	5,057	5,628
Restructuring costs		1,192		1,192
Total operating expenses	5,365	7,557	9,547	17,584
Loss from operations	(5,365)	(7,557)	(9,547)	(17,584)
Other income (expense):
Interest income	42	2	45	5
Interest expense		(4)		(7)
Warrant revaluation gain				6,983
Future tranche right revaluation gain				118,803
Foreign currency exchange gain (loss)	16	(4)	17	(25)
Net income (loss)	(5,307)	(7,563)	(9,485)	108,175
Net income (loss) applicable to common stockholders (Note 11)
- Basic	(5,307)	(7,563)	(9,485)	105,450
- Diluted	$ (5,307)	$ (7,563)	$ (9,485)	$ (17,611)
Net income (loss) per share applicable to common stockholders (Note 11)
- Basic	$ (0.10)	$ (0.15)	$ (0.18)	$ 2.31
- Diluted	$ (0.10)	$ (0.15)	$ (0.18)	$ (0.32)
Weighted-average number of common shares used in computing net income (loss) per share applicable to common stockholders
- Basic	52,972	49,909	52,933	45,575
- Diluted	52,972	49,909	52,933	54,937