Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 58,651	$ 72,026
Marketable securities		12,015
Accounts receivable	315	215
Prepaid expenses and other current assets	1,900	686
Total current assets	60,866	84,942
Prepaid expenses, long term	1,094
Property, plant and equipment, net (note 5)	1,989	2,476
Total assets	63,949	87,418
Current liabilities:
Accounts payable and accrued expenses (note 6)	2,625	2,664
Deferred revenue	157	11,622
Total current liabilities	2,782	14,286
Deferred revenue, less current portion		157
Deferred tenant inducements	133	196
Total liabilities	2,915	14,639
Shareholders’ equity:
Common shares, without par value; unlimited shares authorized; issued and outstanding: 14,385,336 (December 31, 2014 - 14,181,333) (note 7b)	148,634	147,157
Additional paid-in capital	33,083	30,346
Accumulated deficit	(119,693)	(103,734)
Accumulated other comprehensive loss	(990)	(990)
Shareholders’ equity	61,034	72,779
Total liabilities and shareholders’ equity	$ 63,949	$ 87,418
Commitments and contingencies (note 10)