Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flows From Operating Activities:
Net (loss) income for the period	$ (65,766)	$ 2,611
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense	18,704	14,553
Depreciation expense	1,445	1,523
Non-cash lease expense	1,637	1,643
Foreign exchange loss (gain)	71	(230)
Net (accretion)/amortization of marketable securities	(5,809)	(733)
Deferred tax	0	(3,857)
Changes in operating assets and liabilities:
Prepaid expenses	167	676
Other current receivables	559	(10,797)
Other non-current assets	100	89
Accounts payable	4,587	7,066
Accrued expenses and other current liabilities	(916)	(1,291)
Operating lease liability, current portion	117	536
Income taxes	(19,291)	(1,152)
Operating lease liability, net of current portion	(1,771)	(1,672)
Deferred revenue	(32,836)	20,994
Net cash (used in) provided by operating activities	(99,002)	29,959
Cash Flows From Investing Activities:
Purchases of property and equipment	(1,540)	(2,322)
Proceeds from maturities of marketable securities	222,000	6,400
Purchase of marketable securities	(174,298)	(213,914)
Net cash provided by (used in) investing activities	46,162	(209,836)
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	48	283
Proceeds from issuance of common stock under the 2020 Employee Share Purchase Plan	689	432
Net cash provided by financing activities	737	715
Effect of exchange rate fluctuations on cash held	(49)	(74)
Net Decrease In Cash And Cash Equivalents	(52,152)	(179,236)
Cash and cash equivalents at beginning of period	159,521	334,427
Cash and cash equivalents at end of period	107,369	155,191
Supplemental Disclosure Of Cash Flow Information:
Property and equipment purchases incurred but not yet paid	399	0
Right-of-use asset obtained in exchange for new operating lease liability	$ 149	$ 56