Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash Flows From Operating Activities:
Net loss for the period	$ (21,612)	$ (46,887)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense	12,994	12,327
Depreciation expense	989	947
Non-cash lease expense	1,131	1,086
Foreign exchange (gain) loss	(27)	60
Net accretion of marketable securities	(2,908)	(3,928)
Changes in operating assets and liabilities:
Prepaid expenses	(1,024)	1,518
Other current receivables	910	(988)
Other non-current assets	89	89
Accounts payable	4,785	4,429
Accrued expenses and other current liabilities	(1,731)	(17)
Operating lease liability, current portion	(401)	72
Income taxes	940	(2,991)
Operating lease liability, net of current portion	(765)	(1,172)
Deferred revenue	(11,952)	(30,677)
Net cash used in operating activities	(18,582)	(66,132)
Cash Flows From Investing Activities:
Purchases of property and equipment	0	(1,540)
Proceeds from maturities of marketable securities	89,015	169,000
Purchase of marketable securities	(102,213)	(145,796)
Net cash provided by (used in) investing activities	(13,198)	21,664
Cash Flows From Financing Activities:
Proceeds from exercise of stock options	17	44
Proceeds from issuance of common stock under the 2020 Employee Share Purchase Plan	358	409
Net cash provided by financing activities	375	453
Effect of exchange rate fluctuations on cash held	(43)	38
Net Decrease In Cash And Cash Equivalents	(31,448)	(43,977)
Cash and cash equivalents at beginning of period	111,268	159,521
Cash and cash equivalents at end of period	79,820	115,544
Supplemental Disclosure Of Cash Flow Information:
Right-of-use asset obtained in exchange for new operating lease liability	$ 0	$ 149