CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 3,813	$ 5,042
Operating expenses:
Research and development	56,985	45,485
General and administrative	16,037	12,771
Total operating expenses	73,022	58,256
Loss from operations	(69,209)	(53,214)
Other income, net	5	1,312
Net loss before taxes	(69,204)	(51,902)
Provision for income taxes		990
Net loss	(69,204)	(52,892)
Other comprehensive income (loss):
Foreign currency translation gain (loss)	258	(249)
Unrealized gain (loss) on marketable securities	(287)	52
Total comprehensive loss	$ (69,233)	$ (53,089)
Net loss per share, basic and diluted	$ (2.53)	$ (2.19)
Weighted average number of shares used in computing net loss per share, basic and diluted	27,390,326	24,134,305