Condensed Consolidated Statements of Convertible Preferred Shares and Shareholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	Ordinary shares	Deferred Shares	Common stock Ordinary shares	Common stock Deferred Shares	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED OTHER COMPREHENSIVE INCOME	ACCUMULATED DEFICIT
Beginning balance (in shares) at Dec. 31, 2020				35,930,331	1
Beginning balance at Dec. 31, 2020	$ 196,561			$ 367	$ 28	$ 279,480	$ 14,585	$ (97,899)
Exercise of share options (in shares)				581,328
Exercise of share options	998			$ 6		992
Issuance of ordinary shares, net of issuance costs (in shares)				232,227
Issuance of shares due to options exercised in previous year	0			$ 3		(3)
Share-based compensation expense	1,666					1,666
Unrealized gain on foreign currency translation	1,988						1,988
Net loss	(12,715)							(12,715)
Ending balance (in shares) at Mar. 31, 2021				36,743,886	1
Ending balance at Mar. 31, 2021	188,498			$ 376	$ 28	282,135	16,573	(110,614)
Beginning balance (in shares) at Dec. 31, 2021		42,019,874	1	42,019,874	1
Beginning balance at Dec. 31, 2021	$ 284,412			$ 435	$ 28	444,750	8,840	(169,641)
Exercise of share options (in shares)	376,158			376,158
Exercise of share options	$ 397			$ 4		393
Vesting of restricted stock units (in shares)				68,534
Vesting of restricted stock units	1			$ 1
Share-based compensation expense	3,128					3,128
Unrealized gain on foreign currency translation	(7,193)						(7,193)
Net loss	(21,171)							(21,171)
Ending balance (in shares) at Mar. 31, 2022		42,464,566	1	42,464,566	1
Ending balance at Mar. 31, 2022	$ 259,574			$ 440	$ 28	$ 448,271	$ 1,647	$ (190,812)