CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating expenses
Research and development	$ 14,169	$ 9,007	$ 23,727	$ 16,922
General and administrative	9,564	10,558	17,757	20,677
Total operating expenses	23,733	19,565	41,484	37,599
Loss from operations	(23,733)	(19,565)	(41,484)	(37,599)
Other income (expense), net	808	94	2,061	109
Net loss	(22,925)	(19,471)	(39,423)	(37,490)
Other comprehensive income (loss)
Foreign currency translation adjustment	(2)	10	(3)	10
Unrealized gain (loss) on marketable securities	(1)	0	(1)	0
Comprehensive loss	$ (22,928)	$ (19,461)	$ (39,427)	$ (37,480)
Shares used in calculating net loss per common share - basic (in shares)	238,311,498	215,862,977	231,952,888	210,806,330
Shares used in calculating net loss per common share - diluted (in shares)	238,311,498	215,862,977	231,952,888	210,806,330
Net loss per share of common stock - basic (in USD per share)	$ (0.10)	$ (0.09)	$ (0.17)	$ (0.18)
Net loss per share of common stock - diluted (in USD per share)	$ (0.10)	$ (0.09)	$ (0.17)	$ (0.18)