Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 87,962	$ 20,486
Marketable securities	39,166	23,181
Accounts receivable	180	438
Prepaid expenses and other current assets	2,185	716
Total current assets	129,493	44,821
Prepaid expenses, long term		230
Property, plant and equipment, net	962	1,070
Total assets	130,455	46,121
Current liabilities:
Accounts payable and accrued expenses (note 7)	4,413	3,383
Loan payable, current portion (note 8)		700
Total current liabilities	4,413	4,083
Loan payable, long-term (note 8)	14,886	6,104
Total liabilities	19,299	10,187
Shareholders’ equity:
Preferred shares, without par value; unlimited shares authorized; issued and outstanding: 1,568,000 (December 31, 2017 - nil) (note 9b)	11,932
Common shares, without par value; unlimited shares authorized; issued and outstanding: 25,187,441 (December 31, 2017 - 17,998,420) (note 9)	261,655	173,841
Additional paid-in capital	37,886	36,471
Accumulated deficit	(199,327)	(173,388)
Accumulated other comprehensive loss	(990)	(990)
Shareholders' equity	111,156	35,934
Total liabilities and shareholders’ equity	130,455	46,121
Commitments and contingencies (note 10)