Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 37,075	$ 67,754
Marketable securities	64,726	51,552
Accounts receivable	171	151
Prepaid expenses and other current assets	1,353	1,875
Total current assets	103,325	121,332
Operating lease right-of-use asset (note 6)	1,135
Property, plant and equipment, net	1,316	991
Deferred tax assets (note 10)	116	105
Total assets	105,892	122,428
Current liabilities:
Accounts payable and accrued expenses (note 7)	6,676	4,119
Operating lease liability, current (note 6)	587
Loan payable, current (note 8)	2,067
Total current liabilities	9,330	4,119
Operating lease liability (note 6)	573
Loan payable, long-term (note 8)	13,202	15,014
Total liabilities	23,105	19,133
Shareholders’ equity:
Preferred shares, without par value; unlimited shares authorized; issued and outstanding: 1,016,000 (December 31, 2018 - 1,016,000) (note 9)	7,732	7,732
Common shares, without par value; unlimited shares authorized; issued and outstanding: 25,775,056 (December 31, 2018 - 25,750,721) (note 9)	266,062	265,923
Additional paid-in capital	39,391	38,515
Accumulated deficit	(229,408)	(207,885)
Accumulated other comprehensive loss	(990)	(990)
Shareholders' equity	82,787	103,295
Total liabilities and shareholders’ equity	105,892	122,428
Commitments and contingencies (note 11)