Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (52,543)	$ (42,208)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	158	147
Loss on disposal of property and equipment	46	0
Non-cash (loss)/gain on foreign currency remeasurement	(2,251)	2,174
Non-cash share-based compensation	8,632	6,306
Non-cash lease expenses	1,018	1,078
Changes in operating assets and liabilities
Prepaid expenses and other current assets	4,662	(5,461)
Deferred and prepaid tax assets	(255)	(896)
Long-term prepaid expenses and other assets	(7,099)	(409)
Operating lease liabilities	(955)	(1,049)
Accounts payable	(2,899)	1,115
Accrued expenses and other liabilities	(1,050)	(1,925)
Net cash used in operating activities	(52,536)	(41,128)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(48)	(494)
Proceeds from disposal of property and equipment	2	0
Net cash used in investing activities	(46)	(494)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of ordinary shares, net of issuance costs	28,120	0
Payments of tax withholding on stock award	(109)	0
Net proceeds from issuance of long term debt	29,585	0
Payment of issuance cost of long term debt	(778)	0
Proceeds from exercise of share options	1	401
Net cash provided by financing activities	57,008	402
Effect of exchange rate changes on cash, cash equivalents and restricted cash	678	(24,846)
Net increase (decrease) in cash, cash equivalents and restricted cash	5,104	(66,066)
Cash, cash equivalents and restricted cash, beginning of the period	143,381	273,347
Cash, cash equivalents and restricted cash, end of the period	148,485	207,281
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Right of use assets obtained in exchange for new operating lease liabilities	3,645	822
Issuance of warrants together with the long-term debt	687	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	148,234	207,177
Restricted cash	251	104
Total cash, cash equivalents and restricted cash	148,485	207,281
Employee stock
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of shares under the employee share purchase plan and vesting of restricted share units	189	0
Restricted Stock Units (RSUs)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of shares under the employee share purchase plan and vesting of restricted share units	$ 0	$ 1