Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows From Operating Activities:
Net income (loss) for the period	$ 2,611	$ (78,618)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Share-based compensation expense	14,553	8,933
Depreciation expense	1,523	1,103
Non-cash lease expense	1,643	1,248
Foreign exchange (gain) loss	(230)	10
Net (accretion)/amortization of marketable securities	(733)	85
Deferred tax	(3,857)	(1,431)
Changes in operating assets and liabilities:
Prepaid expenses	676	(2,425)
Research and development tax credits receivable	(340)	(295)
Collaboration revenue receivable	(9,626)	0
Other receivables	(831)	3,429
Other non-current assets	89	(616)
Accounts payable	7,066	(295)
Accrued expenses and other current liabilities	(1,291)	5,166
Operating lease liability, current portion	536	(174)
Income taxes	(1,152)	129
Operating lease liability, net of current portion	(1,672)	(584)
Deferred revenue	20,994	(723)
Net cash provided by (used in) operating activities	29,959	(65,058)
Cash Flows From Investing Activities:
Purchases of property and equipment	(2,322)	(1,525)
Proceeds from maturities of marketable securities	6,400	5,450
Purchase of marketable securities	(213,914)	(5,203)
Net cash used in investing activities	(209,836)	(1,278)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	283	712
Proceeds from issuance of common stock under the 2020 Employee Share Purchase Plan	432	283
Net cash provided by financing activities	715	995
Effect of exchange rate fluctuations on cash held	(74)	(60)
Net Decrease In Cash And Cash Equivalents	(179,236)	(65,401)
Cash and cash equivalents at beginning of period	334,427	326,396
Cash and cash equivalents at end of period	155,191	260,995
Supplemental Disclosure Of Cash Flow Information:
Property and equipment purchases incurred but not yet paid	0	13
Right-of-use asset obtained in exchange for new operating lease liability	56	3,827
Deferred financing costs in accruals and other current liabilities	$ 0	$ 104