Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 136,734	$ 148,643
Marketable securities (note 6)	584,801	489,439
Accounts receivable	853	874
Prepaid expenses and other current assets	5,701	6,006
Total current assets	728,089	644,962
Marketable securities, long-term (note 6)	129,062	292,792
Operating lease right-of-use asset, net (note 7)	8,573	9,193
Property, plant and equipment, net	10,138	9,653
Deferred tax assets	733	802
Prepaid expenses, long-term	7,416	7,396
Total assets	884,011	964,798
Current liabilities:
Accounts payable and accrued expenses (note 8)	29,931	25,974
Operating lease liability (note 7)	1,354	1,299
Total current liabilities	31,285	27,273
Operating lease liability, long-term (note 7)	8,679	9,604
Total liabilities	39,964	36,877
Shareholders’ equity:
Common shares, without par value; unlimited shares authorized; issued and outstanding: 75,667,550 (December 31, 2023 - 75,370,977) (note 9)	1,440,458	1,436,374
Additional paid-in capital	176,796	156,764
Accumulated deficit	(770,995)	(665,140)
Accumulated other comprehensive loss	(2,212)	(77)
Total shareholders' equity	844,047	927,921
Total liabilities and shareholders’ equity	884,011	964,798
Commitments and contingencies (note 10)