CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Total revenue	$ 1,014	$ 443
Operating expenses
Research and development	6,826	10,172
General and administrative	6,404	8,306
Total operating expenses	13,230	18,478
Loss from operations	(12,216)	(18,035)
Other income (expense), net	292	709
Net loss	(11,924)	(17,326)
Other comprehensive income (loss)
Foreign currency translation adjustment	5	(1)
Comprehensive loss	$ (11,919)	$ (17,327)
Shares used in calculating net loss per common share - diluted (in shares)	257,232,636	225,523,627
Shares used in calculating net loss per common share - basic (in shares)	257,232,636	225,523,627
Net loss per share of common stock - basic (in USD per share)	$ (0.05)	$ (0.08)
Net loss per share of common stock - diluted (in USD per share)	$ (0.05)	$ (0.08)
Total revenue	$ 1,014	$ 443
Collaborative Arrangements
Total revenue	1,014	443
Operating expenses
Research and development	100	1,500
Other comprehensive income (loss)
Total revenue	$ 1,014	$ 443