Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 375,000	$ 2,776,000	$ 2,125,000	$ 2,776,000
Operating expenses:
Research and development	29,733,000	31,635,000	57,203,000	65,028,000
General and administrative	12,806,000	10,969,000	25,180,000	21,047,000
Total operating expenses	42,539,000	42,604,000	82,383,000	86,075,000
Loss from operations	(42,164,000)	(39,828,000)	(80,258,000)	(83,299,000)
Other income, net:
Dividend income and interest income, net	124,000	8,000	150,000	19,000
Other income, net	744,000	1,054,000	998,000	2,050,000
Total other income, net	868,000	1,062,000	1,148,000	2,069,000
Loss before income taxes	(41,296,000)	(38,766,000)	(79,110,000)	(81,230,000)
Income tax provision	0	0	0	0
Net loss	$ (41,296,000)	$ (38,766,000)	$ (79,110,000)	$ (81,230,000)
Net loss per share attributable to ordinary shareholders basic	$ (0.62)	$ (0.78)	$ (1.25)	$ (1.65)
Net loss per share attributable to ordinary shareholders diluted.	$ (0.62)	$ (0.78)	$ (1.25)	$ (1.65)
Weighted-average ordinary shares used in computing net loss per share attributable to ordinary shareholders basic.	66,479,293	49,973,185	63,514,426	49,220,140
Weighted-average ordinary shares used in computing net loss per share attributable to ordinary shareholders diluted	66,479,293	49,973,185	63,514,426	49,220,140
Other comprehensive loss:
Net loss	$ (41,296,000)	$ (38,766,000)	$ (79,110,000)	$ (81,230,000)
Foreign currency translation	(142,000)		(228,000)	(120,000)
Comprehensive loss	$ (41,438,000)	$ (38,766,000)	$ (79,338,000)	$ (81,350,000)