Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net income (loss)	$ 75,208	$ (39,993)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	375	276
Stock-based compensation	9,953	5,811
Change in operating lease right-of-use assets	4	8
Changes in operating assets and liabilities:
Grants receivable	(333)	(4,185)
Research and development tax credits receivable	(41)	73
Refundable Income Taxes	7,544	0
Prepaid expenses and other current assets	4,360	81
Accounts payable	6,447	8,265
Accrued expenses and other liabilities	(2,286)	50
Income tax payable	12,965	0
Deferred income	189	(3,431)
Deferred revenue	(194,238)	0
Unrecognized tax benefits	25,529	0
Net cash used in operating activities	(54,324)	(33,045)
Cash flows from investing activities
Purchase of property and equipment	(738)	(489)
Purchase of other assets	(99)	(60)
Net cash used in investing activities	(837)	(549)
Cash flows from financing activities
Proceeds from issuance of common stock upon exercise of options	611	862
Net cash provided by financing activities	611	862
Effects of exchange rate changes on cash, cash equivalents and restricted cash	(2,134)	(650)
Net decrease in cash, cash equivalents and restricted cash	(56,684)	(33,382)
Cash, cash equivalents and restricted cash at beginning of period	848,835	336,454
Cash, cash equivalents and restricted cash at end of period	792,151	303,072
Non-cash investing and financing activities
Capital expenditure included in accounts payable	(57)	459
Operating lease liabilities arising from obtaining right-of-use assets	177	3,316
Supplemental disclosure of cash flows
Cash paid for taxes	$ 6,740	$ 0