Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Ordinary Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
Beginning balance at Dec. 31, 2021	$ 384	$ 567,637	$ (3,388)	$ (218,379)	$ 346,254
Beginning balance (in shares) at Dec. 31, 2021	29,579,364
Increase (decrease) in shareholders' equity (deficit)
Issuance of ADSs upon exercise of share options	$ 1	449			450
Issuance of ADSs upon exercise of share options (in shares)	30,074
Issuance of ADSs upon vesting of restricted share units (in shares)	35,000
Share-based compensation expense		10,198			10,198
Foreign currency translation adjustment			920		920
Net loss				(27,564)	(27,564)
Ending balance at Mar. 31, 2022	$ 385	578,284	(2,468)	(245,943)	330,258
Ending balance (in shares) at Mar. 31, 2022	29,644,438
Beginning balance at Dec. 31, 2021	$ 384	567,637	(3,388)	(218,379)	346,254
Beginning balance (in shares) at Dec. 31, 2021	29,579,364
Increase (decrease) in shareholders' equity (deficit)
Foreign currency translation adjustment					3,916
Net loss					(82,739)
Ending balance at Sep. 30, 2022	$ 385	589,679	528	(301,118)	289,474
Ending balance (in shares) at Sep. 30, 2022	29,678,431
Beginning balance at Mar. 31, 2022	$ 385	578,284	(2,468)	(245,943)	330,258
Beginning balance (in shares) at Mar. 31, 2022	29,644,438
Increase (decrease) in shareholders' equity (deficit)
Issuance of ADSs upon exercise of share options		195			195
Issuance of ADSs upon exercise of share options (in shares)	21,879
Share-based compensation expense		5,673			5,673
Foreign currency translation adjustment			2,094		2,094
Net loss				(26,828)	(26,828)
Ending balance at Jun. 30, 2022	$ 385	584,152	(374)	(272,771)	311,392
Ending balance (in shares) at Jun. 30, 2022	29,666,317
Increase (decrease) in shareholders' equity (deficit)
Issuance of ADSs upon exercise of share options		159			159
Issuance of ADSs upon exercise of share options (in shares)	12,114
Share-based compensation expense		5,368			5,368
Foreign currency translation adjustment			902		902
Net loss				(28,347)	(28,347)
Ending balance at Sep. 30, 2022	$ 385	589,679	528	(301,118)	289,474
Ending balance (in shares) at Sep. 30, 2022	29,678,431
Beginning balance at Dec. 31, 2022	$ 387	601,105	387	(331,096)	$ 270,783
Beginning balance (in shares) at Dec. 31, 2022	29,873,893				29,873,893
Increase (decrease) in shareholders' equity (deficit)
Issuance of ADSs upon exercise of share options		1			$ 1
Issuance of ADSs upon exercise of share options (in shares)	877
Issuance of ADSs and non-voting ordinary shares, net of commissions and offering expenses	$ 1	2,715			2,716
Issuance of ADSs and non-voting ordinary shares, net of commissions and offering expenses (in shares)	100,000
Issuance of ADSs upon vesting of restricted share units	$ 1				1
Issuance of ADSs upon vesting of restricted share units (in shares)	56,988
Share-based compensation expense		9,042			9,042
Foreign currency translation adjustment			(316)		(316)
Net loss				(39,064)	(39,064)
Ending balance at Mar. 31, 2023	$ 389	612,863	71	(370,160)	243,163
Ending balance (in shares) at Mar. 31, 2023	30,031,758
Beginning balance at Dec. 31, 2022	$ 387	601,105	387	(331,096)	$ 270,783
Beginning balance (in shares) at Dec. 31, 2022	29,873,893				29,873,893
Increase (decrease) in shareholders' equity (deficit)
Foreign currency translation adjustment					$ 2,498
Net loss					(131,565)
Ending balance at Sep. 30, 2023	$ 550	875,248	2,885	(462,661)	$ 416,022
Ending balance (in shares) at Sep. 30, 2023	42,384,799				42,384,799
Beginning balance at Mar. 31, 2023	$ 389	612,863	71	(370,160)	$ 243,163
Beginning balance (in shares) at Mar. 31, 2023	30,031,758
Increase (decrease) in shareholders' equity (deficit)
Issuance of ADSs upon exercise of share options		165			165
Issuance of ADSs upon exercise of share options (in shares)	12,389
Issuance of ADSs and non-voting ordinary shares, net of commissions and offering expenses	$ 7	12,120			12,127
Issuance of ADSs and non-voting ordinary shares, net of commissions and offering expenses (in shares)	520,000
Issuance of ADSs upon vesting of restricted share units (in shares)	21,793
Share-based compensation expense		8,193			8,193
Foreign currency translation adjustment			(948)		(948)
Net loss				(42,603)	(42,603)
Ending balance at Jun. 30, 2023	$ 396	633,341	(877)	(412,763)	220,097
Ending balance (in shares) at Jun. 30, 2023	30,585,940
Increase (decrease) in shareholders' equity (deficit)
Issuance of ADSs upon exercise of share options		139			139
Issuance of ADSs upon exercise of share options (in shares)	13,296
Issuance of ADSs and non-voting ordinary shares, net of commissions and offering expenses	$ 154	234,338			234,492
Issuance of ADSs and non-voting ordinary shares, net of commissions and offering expenses (in shares)	11,764,706
Issuance of ADSs upon vesting of restricted share units (in shares)	20,857
Share-based compensation expense		7,430			7,430
Foreign currency translation adjustment			3,762		3,762
Net loss				(49,898)	(49,898)
Ending balance at Sep. 30, 2023	$ 550	$ 875,248	$ 2,885	$ (462,661)	$ 416,022
Ending balance (in shares) at Sep. 30, 2023	42,384,799				42,384,799