Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue - License Fee:	$ 0	$ 0	$ 18,000	$ 0
Revenue, Product and Service [Extensible List]	us-gaap:LicenseMember		us-gaap:LicenseMember
Operating expenses:
Research and development	$ 9,344	6,966	$ 28,120	15,379
General and administrative	3,059	1,453	8,300	3,898
Total operating expenses	12,403	8,419	36,420	19,277
Loss from operations	(12,403)	(8,419)	(18,420)	(19,277)
Other income (expense):
Gain (loss) from foreign exchange	(10)	84	3	37
Other income, net		105	92	437
Other (expense), net	(191)
Other income (expense), net	(201)	189	95	474
Net loss	$ (12,604)	$ (8,230)	$ (18,325)	$ (18,803)
Net loss per share, basic and diluted	$ (0.32)	$ (0.67)	$ (0.50)	$ (1.56)
Weighted-average number of shares used to compute net loss per share, basic and diluted	39,962,069	12,260,804	36,662,627	12,068,515
Net income (loss)	$ (12,604)	$ (8,230)	$ (18,325)	$ (18,803)
Unrealized gain on available-for-sale securities	273	25	121	113
Comprehensive loss	$ (12,331)	$ (8,205)	$ (18,204)	$ (18,690)