Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net loss	$ (21,037)	$ (17,528)	$ (42,208)	$ (30,243)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	100	100	147	77
Non-cash gain on foreign currency remeasurement			2,174	(253)
Non-cash share-based compensation			6,306	3,570
Non-cash lease expenses			1,078	541
Changes in operating assets and liabilities
Prepaid expenses and other current assets			(5,461)	(5,365)
Deferred and prepaid tax assets			(896)	(104)
Other assets			(409)	14
Operating lease liabilities			(1,049)	(541)
Accounts payable			1,115	1,113
Accrued expenses and other liabilities			(1,925)	(290)
Net cash used in operating activities			(41,128)	(31,481)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment			(494)	(155)
Net cash used in investing activities			(494)	(155)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds of issuance of ordinary shares, net of issuance costs			0	154,794
Proceeds from exercise of share options			401	998
Proceeds from vesting of restricted share units			1	0
Net cash provided by financing activities			402	155,792
Effect of exchange rate changes on cash, cash equivalents and restricted cash			(24,846)	1,851
Net (decrease)/increase in cash, cash equivalents and restricted cash			(66,066)	126,007
Cash, cash equivalents and restricted cash, beginning of the period			273,347	190,356
Cash, cash equivalents and restricted cash, end of the period	207,281	316,363	207,281	316,363
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Right-of-use assets obtained in exchange for new operating lease liabilities			822	1,049
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	207,177	316,334	207,177	316,334
Short-term restricted cash	104	29	104	29
Total cash, cash equivalents and restricted cash	$ 207,281	$ 316,363	$ 207,281	$ 316,363