Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 270,727	$ 227,827
Prepaid expenses	894	2,499
Tax incentive receivable	10,150	9,282
Other current assets	6,060	3,388
Total current assets	287,831	242,996
Non-current assets:
Furniture and equipment, net	11	73
Goodwill	545	545
Equity interest	15,000	15,000
Right-of-use assets	542	854
Total non-current assets	16,098	16,472
Total assets	303,929	259,468
Current liabilities:
Accounts payable	2,493	2,910
Accrued expenses	7,467	13,752
Current operating lease liabilities	545	675
Taxes payable	0	283
Other current liabilities	444	1,409
Total current liabilities	10,949	19,029
Non-current liabilities:
Term loan	19,857	9,768
Non-current operating lease liabilities	30	205
Total non-current liabilities	19,887	9,973
Total liabilities	30,836	29,002
Commitments and contingencies
Shareholders' equity:
Ordinary £0.05 par value shares; 651,659,630 and 631,338,246 issued, and 635,787,302 and 606,301,054 outstanding, at June 30, 2023 and December 31, 2022, respectively	41,753	40,526
Additional paid-in capital	596,059	529,187
Ordinary shares held in treasury	(975)	(1,549)
Accumulated other comprehensive loss	(4,601)	(4,601)
Accumulated deficit	(359,143)	(333,097)
Total shareholders' equity	273,093	230,466
Total liabilities and shareholders' equity	$ 303,929	$ 259,468