Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 87,809	$ 45,009
Marketable securities	161,816	131,988
Accounts receivable	3,235	1,822
Prepaid expenses and other current assets	3,454	2,964
Total current assets	256,314	181,783
Operating lease right-of-use asset, net (note 6)	2,967	3,326
Property, plant and equipment, net	4,261	3,554
Deferred tax assets (note 11)	811	523
Total assets	264,353	189,186
Current liabilities:
Accounts payable and accrued expenses (note 7)	9,968	10,874
Deferred revenue (note 10)	2,202	3,642
Operating lease liability (note 6)	686	265
Total current liabilities	12,856	14,781
Operating lease liability, long-term (note 6)	2,558	3,050
Total liabilities	15,414	17,831
Shareholders’ equity:
Preferred shares, without par value; unlimited shares authorized; issued and outstanding: 1,016,000 (December 31, 2020 - 1,016,000) (note 9)	7,732	7,732
Common shares, without par value; unlimited shares authorized; issued and outstanding: 41,412,875 (December 31, 2020 - 35,012,125) (note 9)	504,386	397,748
Additional paid-in capital	69,621	45,357
Accumulated deficit	(331,810)	(278,492)
Accumulated other comprehensive loss	(990)	(990)
Shareholders' equity	248,939	171,355
Total liabilities and shareholders’ equity	264,353	189,186
Commitments and contingencies (note 12)