Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 44,199	$ 24,755
Marketable securities	158,555	116,603
Accounts receivable	1,786	813
Prepaid expenses and other current assets	2,470	2,695
Total current assets	207,010	144,866
Operating lease right-of-use asset (note 7)	1,029	933
Property, plant and equipment, net	2,347	1,660
Deferred tax assets (note 12)	290	238
Total assets	210,676	147,697
Current liabilities:
Accounts payable and accrued expenses (note 8)	7,769	8,818
Deferred revenue (note 11)	12,692	29,743
Operating lease liability (note 7)	594	168
Term loan (note 9)		4,650
Total current liabilities	21,055	43,379
Deferred revenue, long-term (note 11)		709
Operating lease liability, long-term (note 7)	323	743
Term loan, long-term (note 9)		10,889
Total liabilities	21,378	55,720
Shareholders’ equity:
Preferred shares, without par value; unlimited shares authorized; issued and outstanding: 1,016,000 (December 31, 2019 - 1,016,000) (note 10)	7,732	7,732
Common shares, without par value; unlimited shares authorized; issued and outstanding: 34,994,790 (December 31, 2019 - 28,139,228) (note 10)	397,652	294,244
Additional paid-in capital	42,218	40,646
Accumulated deficit	(257,314)	(249,655)
Accumulated other comprehensive loss	(990)	(990)
Shareholders' equity	189,298	91,977
Total liabilities and shareholders’ equity	210,676	147,697
Commitments and contingencies (note 13)