Condensed Consolidated Statements of Operations and Comprehensive Loss Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue - License Fee:	$ 0	$ 18,000	$ 0	$ 18,000
Revenue, Product and Service [Extensible Enumeration]	us-gaap:LicenseMember	us-gaap:LicenseMember	us-gaap:LicenseMember	us-gaap:LicenseMember
Operating expenses:
Research and development	$ 6,604	$ 11,522	$ 17,404	$ 18,776
General and administrative	4,662	2,596	8,815	5,241
Total operating expenses	11,266	14,118	26,219	24,017
(Loss) income from operations	(11,266)	3,882	(26,219)	(6,017)
Other income:
Gain (loss) from foreign exchange	25	(5)	26	13
Other (expense) income, net	43	220	45	283
Other (loss) income, net	(18)	215	71	296
Net (loss) income	$ (11,284)	$ 4,097	$ (26,148)	$ (5,721)
Net (loss) income per share, basic	$ (0.28)	$ 0.12	$ (0.65)	$ (0.19)
Net (loss) income per share, diluted	$ (0.28)	$ 0.12	$ (0.65)	$ (0.19)
Weighted-average shares used to compute net (loss) income per share, basic	40,254,890	33,639,481	40,254,890	29,875,877
Weighted-average shares used to compute net (loss) income per share, diluted	40,254,890	34,384,784	40,254,890	29,875,877
Net (loss) income	$ (11,284)	$ 4,097	$ (26,148)	$ (5,721)
Unrealized gain (loss) on available-for-sale securities	75	(40)	(167)	(152)
Comprehensive (loss) income	$ (11,209)	$ 4,057	$ (26,315)	$ (5,873)