Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 60,508	$ 24,755
Marketable securities	169,163	116,603
Accounts receivable	1,617	813
Prepaid expenses and other current assets	2,582	2,695
Total current assets	233,870	144,866
Operating lease right-of-use asset (note 7)	832	933
Property, plant and equipment, net	2,155	1,660
Deferred tax assets (note 12)	186	238
Total assets	237,043	147,697
Current liabilities:
Accounts payable and accrued expenses (note 8)	8,084	8,818
Deferred revenue (note 11)	24,608	29,743
Operating lease liability (note 7)	156	168
Term loan (note 9)	15,676	4,650
Total current liabilities	48,524	43,379
Deferred revenue, long-term (note 11)		709
Operating lease liability, long-term (note 7)	541	743
Term loan, long-term (note 9)		10,889
Total liabilities	49,065	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: 34,956,272 (December 31, 2019 - 28,139,228) (note 10)	397,307	294,244
Additional paid-in capital	41,068	40,646
Accumulated deficit	(257,139)	(249,655)
Accumulated other comprehensive loss	(990)	(990)
Shareholders' equity	187,978	91,977
Total liabilities and shareholders’ equity	237,043	147,697
Commitments and contingencies (note 13)