Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating expenses:
Research and development	$ 27,879	$ 28,991
General and administrative	10,929	12,350
Depreciation and amortization	31	136
Total operating expenses	38,839	41,477
Loss from operations	(38,839)	(41,477)
Other income (expense), net:
Interest expense, net	(88)	(2,282)
Foreign currency exchange loss	(19)	(99)
Tax credit income	796	844
Total other income (expense), net	689	(1,537)
Net loss	$ (38,150)	$ (43,014)
Net loss per share:
Basic	$ (0.25)	$ (0.32)
Diluted	$ (0.25)	$ (0.32)
Weighted average common shares outstanding:
Basic	152,771,817	133,919,145
Diluted	152,771,817	133,919,145
Other comprehensive income (loss):
Loss on foreign currency translation	$ (648)	$ (887)
Unrealized gain (loss) on short-term investments	38	(50)
Total comprehensive loss	$ (38,760)	$ (43,951)