CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Government contracts revenue	$ 49		$ 49
Operating expenses:
Research and development	1,470	$ 3,507	5,960	$ 14,271
General and administrative	2,268	2,331	7,325	7,959
Acquisition-related costs	2,836		2,836
Restructuring and other costs	2,802	130	2,802	1,322
Total operating expenses	9,376	5,968	18,923	23,552
Loss from operations	(9,327)	(5,968)	(18,874)	(23,552)
Other income (expense):
Interest income	111	2	156	7
Interest expense				(7)
Warrant revaluation gain	116		116	6,983
Future tranche right revaluation gain				118,803
Foreign currency exchange and other gain (loss)	(38)	1	(21)	(24)
(Loss) income before income tax benefit	(9,138)	(5,965)	(18,623)	102,210
Income tax benefit	6,039		6,039
Net (loss) income	(3,099)	(5,965)	(12,584)	102,210
Net (loss) income applicable to common stockholders (Note 15)
- Basic	(3,099)	(5,965)	(12,584)	100,574
- Diluted	$ (3,099)	$ (5,965)	$ (12,584)	$ (23,576)
Net (loss) income per share applicable to common stockholders (Note 15)
- Basic	$ (0.06)	$ (0.11)	$ (0.24)	$ 2.10
- Diluted	$ (0.06)	$ (0.11)	$ (0.24)	$ (0.46)
Weighted-average number of common shares used in computing net (loss) income per share applicable to common stockholders
- Basic	53,286	52,740	53,052	47,990
- Diluted	53,286	52,740	53,052	51,613