Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
CURRENT ASSETS:
Cash and cash equivalents	$ 206,953	$ 220,198
Restricted cash	389	440
Prepaid expenses and other current assets	26,319	40,658
Total current assets	233,661	261,296
NON-CURRENT ASSETS:
Operating lease right-of-use assets	2,745	4,306
Deferred tax assets	4,414	3,336
Long-term prepaid expenses and other assets	6,518	7,049
Total assets	247,338	275,987
CURRENT LIABILITIES:
Accounts payable	8,233	5,892
Accrued expenses and other liabilities	13,522	11,301
Debt, current portion	2,156	0
Operating lease liabilities - current	2,300	2,411
Total current liabilities	26,211	19,604
NON-CURRENT LIABILITIES
Debt, non-current portion	27,638	28,757
Operating lease liabilities - non-current	459	1,882
Total liabilities	54,308	50,243
Commitments and contingencies (Note 8)
SHAREHOLDERS' EQUITY:
Ordinary shares, £0.008 par value; 68,409,068 and 61,943,471 shares authorized, issued and outstanding at September 30, 2024 and December 31, 2023, respectively	699	635
Additional paid-in capital	700,273	621,645
Accumulated other comprehensive loss	(16,542)	(16,926)
Accumulated deficit	(491,400)	(379,610)
Total shareholders' equity	193,030	225,744
Total liabilities and shareholders' equity	$ 247,338	$ 275,987